From joost at sanguis.xs4all.nl Sat Oct 3 07:50:15 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Sat, 03 Oct 2009 13:50:15 +0200 Subject: [Retros] Strategems 48, oct-dec 2009 Message-ID: <4AC73A77.5030901@sanguis.xs4all.nl> P0255 - Henryk Grudzinski rsbqkbsr/ppppp1pp/7p/P7/4P3/7P/1PP2P2/4K3 (7+16) +---+---+---+---+---+---+---+---+ |*R |*S |*B |*Q |*K |*B |*S |*R | +---+---+---+---+---+---+---+---+ |*P |*P |*P |*P |*P | |*P |*P | +---+---+---+---+---+---+---+---+ | | . | | . | | . | |*P | +---+---+---+---+---+---+---+---+ | P | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | P | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | P | +---+---+---+---+---+---+---+---+ | | P | P | . | | P | | . | +---+---+---+---+---+---+---+---+ | . | | . | | K | | . | | +---+---+---+---+---+---+---+---+ SPG 10.0, Take&make P0256 - James Soliman rs1kq3/pp1pp1p1/1p3p2/8/8/8/PPRPPPr1/RSBQKBS1 (13+12) +---+---+---+---+---+---+---+---+ |*R |*S | |*K |*Q | . | | . | +---+---+---+---+---+---+---+---+ |*P |*P | . |*P |*P | |*P | | +---+---+---+---+---+---+---+---+ | |*P | | . | |*P | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | P | P | R | P | P | P |*R | . | +---+---+---+---+---+---+---+---+ | R | S | B | Q | K | B | S | | +---+---+---+---+---+---+---+---+ SPG 13.0 P0257 - Paul Monsky rs1qk1s1/b1pppp1b/Rp5r/S5pp/P1P1K3/8/2QPPPPP/B4BSR (15+15) +---+---+---+---+---+---+---+---+ |*R |*S | |*Q |*K | . |*S | . | +---+---+---+---+---+---+---+---+ |*B | |*P |*P |*P |*P | . |*B | +---+---+---+---+---+---+---+---+ | R |*P | | . | | . | |*R | +---+---+---+---+---+---+---+---+ | S | | . | | . | |*P |*P | +---+---+---+---+---+---+---+---+ | P | . | P | . | K | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | Q | P | P | P | P | P | +---+---+---+---+---+---+---+---+ | B | | . | | . | B | S | R | +---+---+---+---+---+---+---+---+ SPG 16.0 P0258 - James Soliman 1s2kbs1/1pp3p1/3p2r1/8/r1qRrP1P/SP6/1PPpP1P1/2BQKBS1 (14+13) +---+---+---+---+---+---+---+---+ | |*S | | . |*K |*B |*S | . | +---+---+---+---+---+---+---+---+ | . |*P |*P | | . | |*P | | +---+---+---+---+---+---+---+---+ | | . | |*P | | . |*R | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ |*R | . |*Q | R |*R | P | | P | +---+---+---+---+---+---+---+---+ | S | P | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | P | P |*P | P | . | P | . | +---+---+---+---+---+---+---+---+ | . | | B | Q | K | B | S | | +---+---+---+---+---+---+---+---+ SPG 19.0 (3 bR) Solutions SG46 (Apr-Jun 2009) ----------------------------- R0149 - Petrovic 1. Bg7xe5(Pe7) e7 2. Se4 e6 3. Sf6xe4(Pe7) e5 4. Bh6 [It is easy to conclude that hxQg1(Qd1) opens the cage. However, to free the queen, Pa2 must be drawn out by bxPa6(Pa2) and then Qe2xPg2(Pg7) must occur. Therefore, let's realise the following plan: 1) to shift Pc7 to the a-file and 2) to shift e-pawn to the g-file] e7 5. Se4 e6 6. Sd2xe4(Pe7) e5 7. Sb1 d7xSe6(Sb1) 8. Sg5 e6 9. Se4 e7 10. Sd6xe4(Pe7) e5 11. Se4xd6(Pd7) e7! 12. Sf6xe4(Pe7) e5 13. Sd5 d7 14. Sf6xd5(Pd7) e6 15. Se4 e7 16. Sd2xe4(Pe7) e5 17. Sb1 cxSd5(Sb1) 18. Sf6 e6 19. Se4 e7 20. Sd2xe4(Pe7) e5 [We have troubles now. The next step cannot be bxSc6 and there is no way to uncapture the b-pawn on b5. The white bishop is useless also. We need a white pawn on b5. Yes, the Bf8 must go to b8 to unpromote himself!] 21. Sb1 e6 22. Bd6! d7xSc6(Sb1) [The e-pawn went to c6 to activate the Pc7!] 23. Se5xc6(Pc7) e7 24. Bb8xd6(Pd7) d7 25. Sf7xe5(Pe7) e6 26. Sd6 e7 27. Se4xd6(Pd7) d7 28. Sf6xe4(Pe7) e5 29. b7 e6 30. Se4 e7 31. Sf6xe4(Pe7) e5 32. b6 e6 33. Se4 e7 34. Sd2xe4(Pe7) e5 35. Sb1 e6 36. b5 b7xSc6(Sb1) 37. Se5 e7 38. Sf7xe5(Pe7) e6 39. Sd6 e7 40. Se4xd6(Pd7) d7 41. Sd2xe4(Pe7) e5 42. Sb1 e6 43. a4xb5(Pb7) a6xSb5(Sb1) [Finally the black pawn crossed the b-file] 44. Sd6 bxa6(Pa2) 45. Sa2 Sc1 46. Se4xd6(Pd7) e7 47. Sd2xe4(Pe7) e5 48. Sb1 e6 [At this moment we have a problem to cross the f-file. Although the Rf2 is free it cannot help. The Bh6 is useless too. Yes, the second unpromotion of the bishop must occur!] 49. Bf8 Se2 50. f7 Sc1 51. f6 Se2 52. f5 f7xSe6(Sb1) 53. Sg5 Sc1 54. Se4 Se2 55. Sd2 Sc1 56. Sb1 Se2 57. exf5(Pf7) g6xSf5(Sb1) 58. Se7 Sc1 59. Rd2 g7 60. Qe2xg2(Pg7) d7 61. Qd1 h4xQg3(Qd1) R0150 - Petrovici 1. Sc8-d6 2. Bh2-b8 3. c7-c8=S & 1. c8=B 2. Bd7 3. Bc6 Qc6# R0151 - Petrovici 1. Se7-g8 2. Sc8-e7 3. c7-c8=S & 1. c8=B 2. Bf5 3. Bc2 Ra1# R0152 - Wenda/Weeth Main plan: -1. Ba2xBb1[Bf1]? Kc2xQd1[Ke8] -2. Qh1xQf3[Qd1] Q~-f3 -3. Rd1-d6 & 1. Re1 Qd3#, but black parries with the forward defense -2... Qh3-f3! & 1...Qh5[Qd8] 2. Qh5#. So white first needs to block h3: -1. Bf1xBg2[Bf1] Bh3-g2 -2. Ba2xBb1[Bf1] Kc2xQd1[Ke8] -3. Qh1xQf3[Qd1] Qg3-f3 -4. Rd1-d6 & 1. Re1! Qd3# (-4. Sd3-c1? & 1. Se1 Qd3 2. Rd8!) Calvet is needed to exclude the defense -2...Kd1xQc2(Ke8)! P0244 - Soliman 1. c4 d5 2. Qa4+ Nd7 3. Qc6 Nf6 4. a4 Ne4 5. Ra3 Nc5 6. Rf3 Na6 7. d3 Nb8 8. Bh6 gxh6 9. g3 Bg7 10. Bh3 O-O 11. Rxf7 Nf6 12. Bxc8 Kh8 13. g4 Ng8 P0245 - Soliman 1. h4 a5 2. h5 a4 3. h6 a3 4. hxg7 axb2 5. gxh8=B bxc1=N 6. Bb2 Nxe2 7. Bc1 Nxg1 8. Qh5 Rxa2 9. Qa5 f5 10. Na3 f4 11. Rb1 f3 12. Rb5 fxg2 13. f4 gxf1=N 14. Kf2 Nxd2 15. Kg3 Nb1 P0246 - Prentos/Soliman 1. Nf3 Nc6 2. Nd4 Ne5 3. Nc6 dxc6 4. Nc3 Bg4 5. Ne4 e6 6. Ng5 Bb4 7. Nxf7 Bc3 8. bxc3 Qf6 9. Ba3 Rd8 10. Bf8 Ne7 11. Bxg7 Rg8 12. Bh6 Rg5 13. Bf8 N5g6 14. Ne5 Rd4 15. Nf3 Ra5 16. Ng1 Nd5 17. Ba3 c5 18. Bc1 P0247 - Soliman 1. Nc3 Nf6 2. Nd5 Ne4 3. Nf6+ exf6 4. Nf3 Bd6 5. Nd4 Bg3 6. Nc6 dxc6 7. hxg3 Be6 8. Rh6 Bb3 9. Rg6 hxg6 10. axb3 Rh5 11. Ra6 Rc5 12. Rb6 Rc3 13. dxc3 axb6 14. Bf4 Ra5 15. Bd6 Rf5 16. Bf8 Rf3 17. exf3 Nd2 18. Ke2 Nb1 19. Qd2 P0248 - Lois/Osorio 1. e4 h5 2. Qg4 hxg4 3. c4 Rh3 4. c5 Rc3 5. c6 dxc6 6. h4 Bf5 7. h5 e6 8. h6 Bd6 9. h7 Bh2 10. h8=Q g3 11. Qh5 Rxc1+ 12. Qd1 Rc4 13. Qb3 Bxe4 14. Qb6 axb6 15. a4 Ra5 16. Na3 Rh5 17. a5 Rh8 18. a6 Bh7 19. a7 f5 20. a8=Q Kf7 21. Qa4 Kg6 22. Qd1 Ra4 23. Nc2 Ra8 P0249 - Baier 1. d4 h5 2. Bf4 h4 3. Bg3 hxg3 4. Nd2 Rh4 5. Nb3 Rg4 6. h4 Nh6 7. h5 Nf5 8. h6 a5 9. h7 a4 10. Rh6 axb3 11. Rc6 dxc6 12. h8=R Qd5 13. Rh1 Qb5 14. d5 Raa4 15. d6 Rad4 16. a4 Be6 17. a5 Bd5 18. a6 e6 19. d7+ Ke7 20. a7 Kd6 21. a8=N Kc5 22. Nb6 Bd6 23. Nc4 Be5 24. Na3 Kb6 25. d8=B Ka6 26. Bg5 f6 27. Bc1 Ne3 28. Nb1+ From mario at velucchi.org Sun Oct 4 13:15:50 2009 From: mario at velucchi.org (Mario Velucchi) Date: Sun, 4 Oct 2009 19:15:50 +0200 Subject: [Retros] Maths & Unusual Chess Mathematics, Chess Problems, ChessBoard Puzzles, Math Chess and unusual aspects of the chess world... In-Reply-To: <29b3a48a0910040434m4bb6194fp5021f089121baf8b@mail.gmail.com> References: <29b3a48a0910040434m4bb6194fp5021f089121baf8b@mail.gmail.com> Message-ID: <29b3a48a0910041015h1483ac73wae566238d207d00a@mail.gmail.com> Maths & Unusual Chess Mathematics, Chess Problems, ChessBoard Puzzles, Math Chess and unusual aspects of the chess world... http://www.velucchi.org/blog2.php -- best .marioV -- Mario Velucchi via Emlia, 106 I-56121 Pisa ? 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URL: From abrobecker at yahoo.com Wed Oct 7 03:56:15 2009 From: abrobecker at yahoo.com (Alain BROBECKER) Date: Wed, 7 Oct 2009 00:56:15 -0700 (PDT) Subject: [Retros] Thierry Le Gleuher 50th birthday Jubilee In-Reply-To: Message-ID: <24720.74096.qm@web56206.mail.re3.yahoo.com> Dear retro-friends Thierry Le Gleuher celebrates his 50th birthday this year. On this occasion he organises a retrograde analysis composing tourney with the following theme: Add one or several pieces on the chessboard. You can find more informations and examples at the following adress: http://abrobecker.free.fr/chess/TLG50.htm Problems shall be sent before 1st of june 2010 to: Alain Brobecker, apt 49, 22 rue Gay Lussac, 02300 CHAUNY, FRANCE or send a document (.txt, .rtf or .pdf, but not .doc) to the electronic adress abrobecker at yahoo.com with TLG50 in the title. The stipulation and the solution of the problem must be in English or French. Alain Brobecker (abrobecker at yahoo.com) |_ _ _ |_ http://abrobecker.free.fr/ |_)(_|(_|| ) of Arm's Tech From joost at sanguis.xs4all.nl Tue Oct 13 08:07:33 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Tue, 13 Oct 2009 14:07:33 +0200 Subject: [Retros] Die Schwalbe Heft 239, oct. 2009 Message-ID: <4AD46D85.6090500@sanguis.xs4all.nl> 14241 - Andrei Frolkin ksRQqB2/2K1rpp1/PrpRp3/bp1p4/1p6/1S6/1PP1PPP1/S4B2 (14+13) +---+---+---+---+---+---+---+---+ |*K |*S | R | Q |*Q | B | | . | +---+---+---+---+---+---+---+---+ | . | | K | |*R |*P |*P | | +---+---+---+---+---+---+---+---+ | P |*R |*P | R |*P | . | | . | +---+---+---+---+---+---+---+---+ |*B |*P | . |*P | . | | . | | +---+---+---+---+---+---+---+---+ | |*P | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | S | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | P | P | . | P | P | P | . | +---+---+---+---+---+---+---+---+ | S | | . | | . | B | . | | +---+---+---+---+---+---+---+---+ Release the position 14242 - Andrei Frolkin 1ksRBB2/1P1K1rp1/bRrPppp1/Qpppp3/8/8/P1P5/8 (10+13) +---+---+---+---+---+---+---+---+ | |*K |*S | R | B | B | | . | +---+---+---+---+---+---+---+---+ | . | P | . | K | . |*R |*P | | +---+---+---+---+---+---+---+---+ |*B | R |*R | P |*P |*P |*P | . | +---+---+---+---+---+---+---+---+ | Q |*P |*P |*P |*P | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | P | . | P | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ Release the position 14243 - Andrei Frolkin 1qKRQB2/p2pRPP1/1p1kppp1/1bbrp3/1r1pP3/2P5/1PP5/8 (11+14) +---+---+---+---+---+---+---+---+ | |*Q | K | R | Q | B | | . | +---+---+---+---+---+---+---+---+ |*P | | . |*P | R | P | P | | +---+---+---+---+---+---+---+---+ | |*P | |*K |*P |*P |*P | . | +---+---+---+---+---+---+---+---+ | . |*B |*B |*R |*P | | . | | +---+---+---+---+---+---+---+---+ | |*R | |*P | P | . | | . | +---+---+---+---+---+---+---+---+ | . | | P | | . | | . | | +---+---+---+---+---+---+---+---+ | | P | P | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ Last 8 single moves? 14244 - Dmitri Baibikov 8/p3p3/8/6PP/4PPrQ/1P1PRKpp/2PRpbBr/4kb2 (12+10) +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ |*P | | . | |*P | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | P | P | +---+---+---+---+---+---+---+---+ | | . | | . | P | P |*R | Q | +---+---+---+---+---+---+---+---+ | . | P | . | P | R | K |*P |*P | +---+---+---+---+---+---+---+---+ | | . | P | R |*P |*B | B |*R | +---+---+---+---+---+---+---+---+ | . | | . | |*K |*B | . | | +---+---+---+---+---+---+---+---+ -10 & #1, Proca retractor 14245 - Unto Heinonen rsb1k3/p1p1pp1p/8/8/8/8/P4PPP/R1BQK1SR (10+9) +---+---+---+---+---+---+---+---+ |*R |*S |*B | . |*K | . | | . | +---+---+---+---+---+---+---+---+ |*P | |*P | |*P |*P | . |*P | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | P | . | | . | | P | P | P | +---+---+---+---+---+---+---+---+ | R | | B | Q | K | | S | R | +---+---+---+---+---+---+---+---+ SPG 9.5 14246 - Alfred Pfeiffer qrk2S2/Ppp1p2p/2P3Pr/2Sp2pB/8/4P3/1PP3PP/BRJ3RQ (16+10) +---+---+---+---+---+---+---+---+ |*Q |*R |*K | . | | S | | . | +---+---+---+---+---+---+---+---+ | P |*P |*P | |*P | | . |*P | +---+---+---+---+---+---+---+---+ | | . | P | . | | . | P |*R | +---+---+---+---+---+---+---+---+ | . | | S |*P | . | |*P | B | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | P | | . | | +---+---+---+---+---+---+---+---+ | | P | P | . | | . | P | P | +---+---+---+---+---+---+---+---+ | B | R | J | | . | | R | Q | +---+---+---+---+---+---+---+---+ #3, Fischer Random Chess 14247 - Bernd Gr?frath rsbqkbsr/ppp2ppp/8/4p3/5P2/8/PPP1S1PP/RSBQ1RK1 (13+15) +---+---+---+---+---+---+---+---+ |*R |*S |*B |*Q |*K |*B |*S |*R | +---+---+---+---+---+---+---+---+ |*P |*P |*P | | . |*P |*P |*P | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | |*P | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | P | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | P | P | P | . | S | . | P | P | +---+---+---+---+---+---+---+---+ | R | S | B | Q | . | R | K | | +---+---+---+---+---+---+---+---+ Proofgame in exactly 7.5 moves, Duellist 14248 - Ivan Antonov rsbqkbsr/p1ppppp1/8/7B/8/2B5/8/1R2K1SR (6+14) +---+---+---+---+---+---+---+---+ |*R |*S |*B |*Q |*K |*B |*S |*R | +---+---+---+---+---+---+---+---+ |*P | |*P |*P |*P |*P |*P | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | B | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | B | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | R | . | | K | | S | R | +---+---+---+---+---+---+---+---+ SPG 12.5 14249 - Werner Keym q4b2/ppppp1pp/8/8/8/8/1PPP4/2KR3k (5+10) +---+---+---+---+---+---+---+---+ |*Q | . | | . | |*B | | . | +---+---+---+---+---+---+---+---+ |*P |*P |*P |*P |*P | |*P |*P | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | P | P | P | | . | | . | +---+---+---+---+---+---+---+---+ | . | | K | R | . | | . |*K | +---+---+---+---+---+---+---+---+ How many squares could the pieces now present on the board have visited maximally, if none of these pieces visited a square more than once? [Wie viele Felder konnten die vorhandenen Steine h?chstens betreten, wenn jeder dieser Steine kein Feld mehrmals betrat?] 14250 - Per Grevlund bernd ellinghoven zum Geburtstag 2r1k3/8/2P5/8/8/2K5/2SP4/8 (4+2) +---+---+---+---+---+---+---+---+ | | . |*R | . |*K | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | P | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | K | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | S | P | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ ser-#9, how many solutions? 14251 - Bernd Schwarzkopf Illegal cluster with wK, bK, 3 wR. The kings are on same-coloured squares, and one rook has only empty neighbouring squares. [Illegal Cluster mit wK, bK, 3 wT. Die K?nige stehen auf derselben Felderfarbe; ein Turm hat nur leere Nachbarfelder.] 14252 - Stephan Dietrich A white knight is placed on a1. On the board are further seven white rooks. (8+0) a) How many positions like this exist with no piece guarding another? b) Generalise for an nxn board with (n-1) rooks (n >= 3) [Auf einem Schachbrett steht auf a1 ein wei?er Springer. Auf dem restlichen Schachbrett stehen 7 wei?e T?rme. a) Wie viele derartige Stellungen gibt es, bei denen keine Figur eine andere deckt? b) Wie viele Stellungen ergeben sich bei einer Verallgemeinerung der Aufgabestellung auf ein nxn Brett (n >= 3) mit wSa1 und n-1 wei?en T?rmen?] Duellist: if legally possible, a move must be made with the piece that moved previously (the duellist). If not possible, a new duellist must be chosen. Take & make: As part of the move, a piece that captures must make one move like the captured piece. If this move isn't possible, the capture isn't legal. Pawns promote only after their 'make' move, and may not end up on their base rank. Checks are orthodox. Fischer Random Chess: At the beginning of the game, the pieces are (symmetrically) shuffled. The king must be between the rooks, and the bishops must be on different square colours. White and black start with the same position of the pieces. Kingside castling is done by moving the king to g1/g8 and the rook that was east of the king to f1/f8, queenside castling is done by moving the king to c1/c8 and the rook that was west of the king to d1/d8. [JdH: For the exact FIDE rules: http://www.fide.com/fide/handbook?id=125&view=article, section F] In 14246, white kingside castling would result in Kc1->g1, Rg1->f1, white queenside castling would result in Kc1->c1 (doesn't move), Rb1->d1, and black queenside castling would result in Kc8->c8 (doesn't move), Rb8->d8. From sdowd367 at gmail.com Tue Oct 13 08:21:26 2009 From: sdowd367 at gmail.com (Steve Dowd) Date: Tue, 13 Oct 2009 07:21:26 -0500 Subject: [Retros] Die Schwalbe Heft 239, oct. 2009 In-Reply-To: <4AD46D85.6090500@sanguis.xs4all.nl> References: <4AD46D85.6090500@sanguis.xs4all.nl> Message-ID: <77afe97a0910130521m2c283c41p13817676ec40466c@mail.gmail.com> Hello Joost and list, unless I am missing something the Pfeffer diagram doesn't have a WK. Is that intentional? On Tue, Oct 13, 2009 at 7:07 AM, Joost de Heer wrote: > 14241 - Andrei Frolkin > ksRQqB2/2K1rpp1/PrpRp3/bp1p4/1p6/1S6/1PP1PPP1/S4B2 (14+13) > +---+---+---+---+---+---+---+---+ > |*K |*S | R | Q |*Q | B | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | K | ? |*R |*P |*P | ? | > +---+---+---+---+---+---+---+---+ > | P |*R |*P | R |*P | . | ? | . | > +---+---+---+---+---+---+---+---+ > |*B |*P | . |*P | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? |*P | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | S | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | P | P | . | P | P | P | . | > +---+---+---+---+---+---+---+---+ > | S | ? | . | ? | . | B | . | ? | > +---+---+---+---+---+---+---+---+ > Release the position > > 14242 - Andrei Frolkin > 1ksRBB2/1P1K1rp1/bRrPppp1/Qpppp3/8/8/P1P5/8 (10+13) > +---+---+---+---+---+---+---+---+ > | ? |*K |*S | R | B | B | ? | . | > +---+---+---+---+---+---+---+---+ > | . | P | . | K | . |*R |*P | ? | > +---+---+---+---+---+---+---+---+ > |*B | R |*R | P |*P |*P |*P | . | > +---+---+---+---+---+---+---+---+ > | Q |*P |*P |*P |*P | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | P | . | P | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > Release the position > > 14243 - Andrei Frolkin > 1qKRQB2/p2pRPP1/1p1kppp1/1bbrp3/1r1pP3/2P5/1PP5/8 (11+14) > +---+---+---+---+---+---+---+---+ > | ? |*Q | K | R | Q | B | ? | . | > +---+---+---+---+---+---+---+---+ > |*P | ? | . |*P | R | P | P | ? | > +---+---+---+---+---+---+---+---+ > | ? |*P | ? |*K |*P |*P |*P | . | > +---+---+---+---+---+---+---+---+ > | . |*B |*B |*R |*P | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? |*R | ? |*P | P | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | P | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | P | P | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > Last 8 single moves? > > 14244 - Dmitri Baibikov > 8/p3p3/8/6PP/4PPrQ/1P1PRKpp/2PRpbBr/4kb2 (12+10) > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > |*P | ? | . | ? |*P | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | P | P | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | P | P |*R | Q | > +---+---+---+---+---+---+---+---+ > | . | P | . | P | R | K |*P |*P | > +---+---+---+---+---+---+---+---+ > | ? | . | P | R |*P |*B | B |*R | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? |*K |*B | . | ? | > +---+---+---+---+---+---+---+---+ > -10 & #1, Proca retractor > > 14245 - Unto Heinonen > rsb1k3/p1p1pp1p/8/8/8/8/P4PPP/R1BQK1SR (10+9) > +---+---+---+---+---+---+---+---+ > |*R |*S |*B | . |*K | . | ? | . | > +---+---+---+---+---+---+---+---+ > |*P | ? |*P | ? |*P |*P | . |*P | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | P | . | ? | . | ? | P | P | P | > +---+---+---+---+---+---+---+---+ > | R | ? | B | Q | K | ? | S | R | > +---+---+---+---+---+---+---+---+ > SPG 9.5 > > 14246 - Alfred Pfeiffer > qrk2S2/Ppp1p2p/2P3Pr/2Sp2pB/8/4P3/1PP3PP/BRJ3RQ (16+10) > +---+---+---+---+---+---+---+---+ > |*Q |*R |*K | . | ? | S | ? | . | > +---+---+---+---+---+---+---+---+ > | P |*P |*P | ? |*P | ? | . |*P | > +---+---+---+---+---+---+---+---+ > | ? | . | P | . | ? | . | P |*R | > +---+---+---+---+---+---+---+---+ > | . | ? | S |*P | . | ? |*P | B | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | P | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | P | P | . | ? | . | P | P | > +---+---+---+---+---+---+---+---+ > | B | R | J | ? | . | ? | R | Q | > +---+---+---+---+---+---+---+---+ > #3, Fischer Random Chess > > 14247 - Bernd Gr?frath > rsbqkbsr/ppp2ppp/8/4p3/5P2/8/PPP1S1PP/RSBQ1RK1 (13+15) > +---+---+---+---+---+---+---+---+ > |*R |*S |*B |*Q |*K |*B |*S |*R | > +---+---+---+---+---+---+---+---+ > |*P |*P |*P | ? | . |*P |*P |*P | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? |*P | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | P | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | P | P | P | . | S | . | P | P | > +---+---+---+---+---+---+---+---+ > | R | S | B | Q | . | R | K | ? | > +---+---+---+---+---+---+---+---+ > Proofgame in exactly 7.5 moves, Duellist > > 14248 - Ivan Antonov > rsbqkbsr/p1ppppp1/8/7B/8/2B5/8/1R2K1SR (6+14) > +---+---+---+---+---+---+---+---+ > |*R |*S |*B |*Q |*K |*B |*S |*R | > +---+---+---+---+---+---+---+---+ > |*P | ? |*P |*P |*P |*P |*P | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | B | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | B | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | R | . | ? | K | ? | S | R | > +---+---+---+---+---+---+---+---+ > SPG 12.5 > > 14249 - Werner Keym > q4b2/ppppp1pp/8/8/8/8/1PPP4/2KR3k (5+10) > +---+---+---+---+---+---+---+---+ > |*Q | . | ? | . | ? |*B | ? | . | > +---+---+---+---+---+---+---+---+ > |*P |*P |*P |*P |*P | ? |*P |*P | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | P | P | P | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | K | R | . | ? | . |*K | > +---+---+---+---+---+---+---+---+ > How many squares could the pieces now present on the board have visited > maximally, if none of these pieces visited a square more than once? > [Wie viele Felder konnten die vorhandenen Steine h?chstens betreten, > wenn jeder dieser Steine kein Feld mehrmals betrat?] > > 14250 - Per Grevlund > bernd ellinghoven zum Geburtstag > 2r1k3/8/2P5/8/8/2K5/2SP4/8 (4+2) > +---+---+---+---+---+---+---+---+ > | ? | . |*R | . |*K | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | P | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | ? | . | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | K | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > | ? | . | S | P | ? | . | ? | . | > +---+---+---+---+---+---+---+---+ > | . | ? | . | ? | . | ? | . | ? | > +---+---+---+---+---+---+---+---+ > ser-#9, how many solutions? > > 14251 - Bernd Schwarzkopf > Illegal cluster with wK, bK, 3 wR. The kings are on same-coloured > squares, and one rook has only empty neighbouring squares. > [Illegal Cluster mit wK, bK, 3 wT. Die K?nige stehen auf derselben > Felderfarbe; ein Turm hat nur leere Nachbarfelder.] > > 14252 - Stephan Dietrich > A white knight is placed on a1. On the board are further seven white > rooks. (8+0) > a) How many positions like this exist with no piece guarding another? > b) Generalise for an nxn board with (n-1) rooks (n >= 3) > [Auf einem Schachbrett steht auf a1 ein wei?er Springer. Auf dem > restlichen Schachbrett stehen 7 wei?e T?rme. > a) Wie viele derartige Stellungen gibt es, bei denen keine Figur eine > andere deckt? > b) Wie viele Stellungen ergeben sich bei einer Verallgemeinerung der > Aufgabestellung auf ein nxn Brett (n >= 3) mit wSa1 und n-1 wei?en T?rmen?] > > Duellist: if legally possible, a move must be made with the piece that moved > previously (the duellist). If not possible, a new duellist must be chosen. > Take & make: As part of the move, a piece that captures must make one move > like the captured piece. If this move isn't possible, the capture isn't > legal. Pawns promote only after their 'make' move, and may not end up on > their base rank. Checks are orthodox. > Fischer Random Chess: At the beginning of the game, the pieces are > (symmetrically) shuffled. The king must be between the rooks, and the > bishops must be on different square colours. White and black start with the > same position of the pieces. Kingside castling is done by moving the king to > g1/g8 and the rook that was east of the king to f1/f8, queenside castling is > done by moving the king to c1/c8 and the rook that was west of the king to > d1/d8. [JdH: For the exact FIDE rules: > http://www.fide.com/fide/handbook?id=125&view=article, section F] > In 14246, white kingside castling would result in Kc1->g1, Rg1->f1, white > queenside castling would result in Kc1->c1 (doesn't move), Rb1->d1, and > black queenside castling would result in Kc8->c8 (doesn't move), Rb8->d8. > _______________________________________________ > Retros mailing list > Retros at janko.at > http://www.pairlist.net/mailman/listinfo/retros > From joost at sanguis.xs4all.nl Tue Oct 13 08:30:30 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Tue, 13 Oct 2009 14:30:30 +0200 Subject: [Retros] Die Schwalbe Heft 239, oct. 2009 In-Reply-To: <4AD46D85.6090500@sanguis.xs4all.nl> References: <4AD46D85.6090500@sanguis.xs4all.nl> Message-ID: <4AD472E6.9030909@sanguis.xs4all.nl> > 14246 - Alfred Pfeiffer > qrk2S2/Ppp1p2p/2P3Pr/2Sp2pB/8/4P3/1PP3PP/BRJ3RQ (16+10) > +---+---+---+---+---+---+---+---+ > |*Q |*R |*K | . | | S | | . | > +---+---+---+---+---+---+---+---+ > | P |*P |*P | |*P | | . |*P | > +---+---+---+---+---+---+---+---+ > | | . | P | . | | . | P |*R | > +---+---+---+---+---+---+---+---+ > | . | | S |*P | . | |*P | B | > +---+---+---+---+---+---+---+---+ > | | . | | . | | . | | . | > +---+---+---+---+---+---+---+---+ > | . | | . | | P | | . | | > +---+---+---+---+---+---+---+---+ > | | P | P | . | | . | P | P | > +---+---+---+---+---+---+---+---+ > | B | R | J | | . | | R | Q | > +---+---+---+---+---+---+---+---+ > #3, Fischer Random Chess The J is of course not a Joker, but a King. Correct FEN: qrk2S2/Ppp1p2p/2P3Pr/2Sp2pB/8/4P3/1PP3PP/BRK3RQ From joost at sanguis.xs4all.nl Wed Oct 14 18:44:11 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Thu, 15 Oct 2009 00:44:11 +0200 Subject: [Retros] Solutions Die Schwalbe Heft 236 Message-ID: <4AD6543B.9080909@sanguis.xs4all.nl> 14060 - Frolkin White pawns captured four times, black pawns twice, so the black h-pawn promoted without capturing. Retro: -1. Sb8-d7# Bh4-g3 [Check avoidance #1] -2. b2xQa3 Qh3-a3 -3. e3-e4 Qc8-h3 [Check avoidance #2] -4. Sd7-b8 Qb8-c8 -5. Sc5-d7 Qc8-b8 -6. Se4-c5 Bg3-h4 -7. Sd6-e4 Qg4-c8 -8. Sc8-d6+ Bh4-g3 [Check avoidance #3] -9. Rb8-a8 Qh3-g4 -10. Ra8-b8 Qh1-h3 -11. Rb8-a8 h2-h1=Q -12. Ra8-b8 h3-h2 -13. Rb8-a8 Bg3-h4 -14. Ra8-b8 h4-h3 -15. Rb8-a8 h5-h4 -16. Ra8-b8 h6-h5 -17. h5x(S|Q)g6 etc *14061 - Wenda To avoid a cook, the condition is changed to 'Anticirce Cheylan'. -1. Ke1-f2? illegal! -1. g2xSh3[Ph2]! Sf4-h3? -2. Ke1-f2 Qh8-h1 -3. Kb1xBb2[Ke1] Qg8-h8 -4. Ka1-b1 Qh8-g8 -5. b5xPa6ep[Pa2] a7-a5 -6. Kb1-a1 Qg8-h8 -7. Ka1-b1 Qh8-g8 -8. Kb1-a1 Qg8-h8 -9. Ka1-b1 Ba2xSb1[Bc8]/a2xSb1=B[Bc8] (Forced to avoid triple repetition, a knight must be uncaptured because it's the only piece that can explain the check by the white queen) -10. Sb8xPd7[Sb1] Qh8-g8 -11. Be7-c5 & 1. Sa6# -1. g2xSh3[Ph2]! Sg1-h3!! Now the mainplan doesn't work, because c7 isn't guarded anymore. So a new pendulum is created to remove Sg1: -2. b5xPa6ep[Pa2] a7-a5 -3. Kf3-f2 Sh3-g1 -4. Kf2-f3 Sg1-h3 -5. Kf3-f2 Sh3-g1 -6. Kf2-f3 Sf4-h3 (Forced to avoid triple repetition). And now the mainplan with a slight modification: -7. Ke1-f2 Qh8-h1 -8. Kb1xBb2[Ke1] Qg8-h8 -9. Ka1-b1 Qh8-g8 -10. f5xPe6ep[Pe2] e7-e5 -11. Kb1-a1 Qg8-h8 -12. Ka1-b1 Qh8-g8 -13. Kb1-a1 Qg8-h8 -14. Ka1-b1 Ba2xSb1[Bc8]/a2xSb1=B[Bc8] (Forced to avoid triple repetition, a knight must be uncaptured because it's the only piece that can explain the check by the white queen) -15. Sb8xPd7[Sb1] (must be a pawn, other pieces can interfere on the queen line, or block d1 in the forward play) Qh8-g8 -16. Bb6-c5 & 1. Sa6# Further tries: -8. Kb1xRb2[Ke1]? .. -14... a2xSb1=B[Bc8]! -15. Sb8xBd7[Sb1] (must be a bishop because the missing pawns are needed for the promoted knight and rook) ... 1. Sa6 Bc8! -10. d5xPe6[Pe2]? -14... Ba2xSb1=B[Bc8]! ... 1. Sa6 Bxd5[Bc8]! 14062 - Keym There are three cases: - Only wOOO and bOO are allowed (#3 with 1. Rf1!) - Only wOO and bOOO are allowed (#3 with 1. Rd1!) - No white castling, both black castlings are allowed. No mate in 3. 14063 - Gr?frath 1. e3 d5 2. Bc4 d4 3. Bd5 Qxd5 4. Nf3 Qxf3 5. O-O Qxd1 6. f3 Qxc1 7. Kf2 Qxb1 8. Ke2 Qxa2 9. Rae1 e6 10. Kd1 Bd6 11. Kc1 Ne7 12. Rd1 O-O White has castled... kingside! 14064 - Dupont 1. a4 c5 2. a5 Qb6 3. axb6 a5 4. h4 a4 5. h5 a3 6. h6 a2 7. hxg7 h5 8. Na3 h4 9. Rb1 a1=N 10. b4 Nb3 11. cxb3 h3 12. Nc2 h2 13. Na1 Rh3 14. Qc2 Rf3 15. exf3 c4 16. Ke2 c3 17. Kd3 cxd2 18. Qc5 d1=B 19. Bf4 d5 20. Bg3 d4 21. Ke4 d3 22. f4 Bf3+ 23. gxf3 d2 24. Ne2 d1=Q 25. Rg1 h1=R 26. Bg2 Rh8 27. Bh1 Qd8 AUW: Queen and rook Pronkin, bishop and knight Ceriani-Frolkin. 14065 - Gr?frath 1. e4 Na6 2. Bxa6 Nf6 3. Bc4 Nh5 4. Qxh5 g5 5. Ne2 Bh6 6. Qxh6 Rf8 7. Bxf7+ Kxf7 8. Qh5+ Kg8 9. O-O Black pseudo-castling. 14066 - Petrovic -1. Se7*Sg8 a7-a6 -2. Bc8xSd7[Sg8] Sb8-d7 -3. Bd7*Bc8 Sa6-b8 -4. g2xBh3[Bc8] Sb8-a6 -5. Sc8xSe7[Sb8] Sg8-e7 -6. Se7-c8 Sf3xPg5[Pg2] -7. Bc8xSd7[Sg8] Sb8-d7 -8. Bd7-c8 [Now the white bishop and knight keep on uncapturing the knight, which oscillates between b8 and g8, while black prepares the retraction of g2xSh3] Bf1xPh3[Ph2] -9. Sc8xSe7[Sb8] Sg8-e7 -10. Se7-c8 Se1-f3 -11. Bc8xSd7[Sg8] Sb8-d7 -12. Bd7-c8 Sc2-e1 -13. Sc8xSe7[Sb8] Sg8-e7 -14. Se7-c8 Sb4-c2 -15. Bc8xSd7[Sg8] Sb8-d7 -16. Bd7-c8 Sa6-b4 -17. Sc8xSe7[Sg8] Sg8-e7 -18. Se7-c8 Sb8-a6 -19. g2xSh3[Sg8] (and from now on, only the relevant uncapturing moves are given): -27... Sf1xPg3[Pg2] -36. f2xSg3[Sb8] -44... Se1xPf3[Pf2] -51. e2xSf3[Sg8] -59... Sc2xPe3[Pe2] -64. d2xSe3[Sb8] -66... Bc4xPd3[Pd2] -75. c2xSd3[Sg8] -77... Ba6xPc4[Pc2] -78. b3xSc4[Sg8] -79. a2xPb3[Pb7] and the position is finally released. *14077 - Shankar Intention: -1. Sd7-f8 OOO -2. Kh8-g8! [tempo] d4-d3 -3. Kg7-h8 d5-d4 -4. Kf6-g7 d6-d5 -5. Sb8-d7 d7-d6 -6. b7-b8=S and 1. ba8=Q/R# But b7-b8=S is an illegal retraction, as black has no last move. Mario Richter proposes to add a black pawn on g6 as correction, since black can't take back -2... g7-g6 because it'd trap the king. 14078 - Keym a) Ke1 Pe2 Pe3 - Ke8: Sum of distances to homesquares is sqrt(2). b) Ke1 Pe2 Qe3 - Ke8: Sum of distances to homesquares is sqrt(5). c) Try: Ke1 Be2 Qe3 - Ke8: sum of distances to homesquares is sqrt(2)+sqrt(5) ~~ 3.6. But there is a better solution: Ke1 Sb1 Rh1 - Ke5 where the distance is 3. From joost at sanguis.xs4all.nl Wed Oct 21 04:25:27 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Wed, 21 Oct 2009 10:25:27 +0200 Subject: [Retros] Champagne 2009 Message-ID: <4ADEC577.3040904@sanguis.xs4all.nl> http://ubp.org.br/wccc2009/composing/Champagne.pdf From joost at sanguis.xs4all.nl Fri Oct 23 04:41:02 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Fri, 23 Oct 2009 10:41:02 +0200 Subject: [Retros] PCCC meeting decisions Message-ID: <4AE16C1E.7030108@sanguis.xs4all.nl> http://www.saunalahti.fi/~stniekat/pccc/dec09.htm For retro-composers the following is of importance: "The last sentence in paragraph 3 of Article 16 of the Codex was modified." New article 16: Article 16 - Castling and En-passant capture (1) Castling convention. Castling is permitted unless it can be proved that it is not permissible. (2) En-passant convention. An en-passant capture on the first move is permitted only if it can be proved that the last move was the double step of the pawn which is to be captured [20]. (3) Partial Retrograde Analysis (PRA) convention. Where the rights to castle and/or to capture en-passant are mutually dependent, the solution consists of several mutually exclusive parts. All possible combinations of move rights, taking into account the castling convention and the en-passant convention, form these mutually dependent parts. If in the case of mutual dependency of castling rights a solution is not possible according to the PRA convention, then the Retro-Strategy (RS) convention should be applied: whichever castling is executed first is deemed to be permissible. (4) Other conventions should be expressly stipulated, for example if in the course of the solution an en-passant capture has to be legalised by subsequent castling (a posteriori convention AP). (Does anyone know what changed *exactly*?) From liskov at im.bas-net.by Sun Oct 25 07:31:30 2009 From: liskov at im.bas-net.by (liskov at im.bas-net.by) Date: Sun, 25 Oct 2009 13:31:30 +0200 Subject: [Retros] PCCC meeting decisions In-Reply-To: <4AE16C1E.7030108@sanguis.xs4all.nl> References: <4AE16C1E.7030108@sanguis.xs4all.nl> Message-ID: <1256470290.4ae43712ce014@im.bas-net.by> Below is the Proposal for Completion of Article 16 of the Codex prepared by W.Keym and presented at the Meeting of PCCC in Rio (diagrams are replaced with brackets by me - VL). ==== start Paragraph 3 of article 16 of the ?Codex for Chess Composition? of September 4th, 2008 runs as follows: (3) Partial Retrograde Analysis (PRA) convention. Where the rights to castle and/or to capture en passant are mutually dependent, the solution consists of several mutually exclusive parts. All possible combinations of move rights, taking into account the castling convention and the en passant convention, form these mutually exclusive parts. IN THE SPECIAL CASE WHERE WHITE?S RIGHT TO CASTLE EXCLUDES BLACK?S RIGHT TO CASTLE (AND VICE VERSA), AN ALTERNATIVE IS POSSIBLE: THE PARTY EXERCISING THIS RIGHT FIRST IS ENTITLED TO CASTLE (RETRO STRATEGY (RS) CONVENTION). In this paragraph there is a gap concerning certain types of helpmates (see A?C), as Valery Liskovets found out. A Armand Lapierre `?? 1937 [PDB P0533945] H#2. 1.Bc5! 0-0-0. B Classic example Original [W Kc6 Rc1; B Ke8 Ra8 Rh8] H#1,5. 1.Ra1! 0-0-0 C Luigi Ceriani ?The Problemist? 1931 [PDB P0001878] H#3. Either 1.0-0! or 1.R:h2! In A, White moved last, therefore w0-0-0 and w0-0 exclude each other. If w0-0-0 is permitted, then the solution is 1.Bc5! 0-0-0 2.0-0 Rdg1#; if w0-0 is permitted, then no solution exists. According to the current codex A is incorrect. In B, Black moved last, therefore b0-0-0 and b0-0 exclude each other. If 0-0-0 is permitted, then the solution is 1.Ra1! 0-0-0 2.Ra8#; if 0-0 is permitted, then no solution exists. According to the current codex B is incorrect. In C, w0-0-0 and b0-0 exclude each other. If 0-0 is permitted, then the solution is 1.0-0 a4 2.Kh8 Ra3 3.Rg8 Rh3#; if 0-0-0 is permitted, then the solution is 1.R:h2 0-0-0 2.R:e2 Rh1 3.Re7 Rh8#. Should this problem be solved according to the PRA convention? In that case there is one solution which consists of the two parts 1.0-0 or 1.R:h2. Or should it be solved according to the RS convention? In that case there is the solution 1.0-0, as Black castles first. Who decides: the author by stating an additional stipulation or, if he does not do so, the solver by reference? To fill this gap and to complete article 16, it is proposed to the PCCC that the following reformulation be substituted for the sentences underlined above: IF IN THE CASE OF MUTUAL DEPENDENCY OF CASTLING RIGHTS A SOLUTION IS NOT POSSIBLE ACCORDING TO THE PRA CONVENTION, THEN THE RETRO-STRATEGY (RS) CONVENTION SHOULD BE APPLIED: WHICHEVER CASTLING IS EXECUTED FIRST IS DEEMED TO BE PERMISSIBLE. This reformulation results in a logical ORDER: in problems with mutually exclusive castling rights the PRA convention is applied first. If that does not lead to a solution according to the PRA convention, the RS convention should be applied. A has no second partial solution, so it is not a PRA problem. Therefore the RS convention is applied, with the result that A is a correct RS problem with the solution 1.Bc5. It is the same in the case of B. This is a correct RS problem with the solution 1.Ra1. C has two partial solutions (either 1.0-0 or 1.R:h2) and is a correct PRA problem. Conclusion: This reformulation brings nothing but advantages. All cases (w/w, w/b & b/b castling) are taken into consideration. All PRA and RS problems remain correct. Treacherous additional stipulations such as PRA or RS become superfluous. ==== finish I don't know whether it was published as an article in Die Schwalbe. WK sent it to me with the following title and foreword (in German): Vorschlag zur Vervollstandigung des Artikels 16 des Kodex ?Nach der Aenderung des Artikels 16 (?Rochade und En-passant-Schlag?) des ?Kodex fuer Schachkomposition? am 4.9.2008 in Jurmala machte Valery Liskovets (Minsk) mich auf positive wie negative Folgen fuer bestimmte Hilfmattprobleme mit einander ausschliessenden Rochaden aufmerksam. Nach einer Eroerterung mit Retro-Freunden auf der Schwalbe-Tagung am 3.10.2008 und nach intensivem Gedankenaustausch zwischen Valery Liskovets und mir glauben wir, eine Loesung und Neuformulierung gefunden zu haben, die den geltenden Artikel 16 vervollstaendigt, indem sie alle vorhandenen Faelle widerspruchsfrei integriert, naemlich einander ausschliessende weiss-weisse, weiss-schwarze und schwarz-schwarze Rochaden im direkten Mattproblem und im Hilfsmattproblem." V.Liskovets Joost de Heer wrote: > http://www.saunalahti.fi/~stniekat/pccc/dec09.htm > > For retro-composers the following is of importance: > > "The last sentence in paragraph 3 of Article 16 of the Codex was modified." > > ... > > (Does anyone know what changed *exactly*?) From liskov at im.bas-net.by Sun Oct 25 08:44:25 2009 From: liskov at im.bas-net.by (liskov at im.bas-net.by) Date: Sun, 25 Oct 2009 14:44:25 +0200 Subject: [Retros] PCCC meeting decisions: comments, history In-Reply-To: <4AE16C1E.7030108@sanguis.xs4all.nl> References: <4AE16C1E.7030108@sanguis.xs4all.nl> Message-ID: <1256474665.4ae4482949625@im.bas-net.by> Dear retro-funs, 1. In my opinion, this current wording of Art.16(3) of the Codex (Rio de Janeiro, Oct 2009) is a great leap in "justifying" controversial retro-genres. It is a very pleasant surprise for me that Werner Keym (in cooperation with other experts) has managed to push this correction of Jurmala's 2008 formulation (which has finally justified PRA as an uncoditional orthodox genre!). 2. Frankly speaking, I'm not fully satisfied still: AP does remain a conditional genre whereas it deserves to be (and can quite easily be, at least in its classic form a la' Keeble - Petrovic) incorporated in a naturally extended genre hierarchy in a similar way. Besides, retro-strategy is too narrowly restricted to incompatible castlings. Well, let these tasks stay for the future. 3. Btw, since RS is now (after Jurmala) strictly defined, in all SIMILAR but DIFFERENT cases (mainly in fairy retro) I offer, once again, to use the term "PF" (post factum) instead of it ("subordination" also suits): RS is a particular case of PF but, unlike the latter, it doesn't need to be stipulated expressly. 4. Several details on the pre-history. The unlucky consequence of Jurmala's wording of Art.16(3) overlooked by its authors and explained in the proposal of W.Keym was indicated in my article ?Retrovariants in helpmates with two white castlings", `StrateGems?, No.19, 2002, where I wrote: ?... there are two dozens of h#-problems ... that possess formally the features of pRA (no last move preserves both castlings) but whose solutions do not depend on the answer: which castling is legal. These problems would become unsound under pRA; thus, we cannot reinterpret them retroanalytically" (p.159). Two such examples are reproduced in the article. Of course, this elementary fact was well known long ago (but perhaps not in written form?). In this forum I first mentioned such an undesirable consequence in my mail of 19 Sep 2008 (illustrating this by the problem P0534191 of Orlik). That time WK and I began to intensively discuss this situation. 5. MOST importantly, the very idea to use an appropriate ordering of controversial genres for the recognition by the solver of the genuine genre of a problem was proposed by me in the article ?An order in controversial retro-genres", `Shakhm. Kompoz.?, 1993, No.6, 58-60 (in Russian). Later on, I described or mentioned this idea several times in the Retros mailing list (for the first time in my mail of 4 Dec 1996). This global "hierarchical" proposal included 4 genres (in the prescribed order): 1. AL(=ad libitum; "typ Keym") 2. AP(=a posteriori) 3. PF (subordination) 4. PR ("typ Oeffner"). Now, A PROBLEM IS ASSUMED TO BELONG TO THE LEAST GENRE IN WHICH IT HAS A (full) SOLUTION! W.Keym significantly simplified this natural idea (now I think that the differentiation between AL and PR inside PRA is NOT essential indeed...). Apparently, of particular attractivity for adherents of PRA is the fact that such a suitable hierarchy begins with PRA rather than with RS; for me, on the contrary, this does not matter: any order that ensures identifying properly the genre of a controversial problem in the process of solving is equally acceptable. Valery Liskovets Joost de Heer wrote: > http://www.saunalahti.fi/~stniekat/pccc/dec09.htm > > For retro-composers the following is of importance: > > "The last sentence in paragraph 3 of Article 16 of the Codex was modified." > From joost at sanguis.xs4all.nl Sun Oct 25 19:13:01 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Mon, 26 Oct 2009 00:13:01 +0100 Subject: [Retros] Lecture in Rio Message-ID: <4AE4DB7D.6080604@sanguis.xs4all.nl> From the bulletin: LECTURES, OCT 12 A Proofgame inspired by Antonio Carlos Jobim Roberto OSORIO (Argentina) What was this lecture about? Roberto, do you have an electronic version of the lecture? From retromode at web.de Mon Oct 26 02:47:32 2009 From: retromode at web.de (=?iso-8859-15?Q?Bernd_Gr=E4frath?=) Date: Mon, 26 Oct 2009 07:47:32 +0100 Subject: [Retros] Lecture in Rio Message-ID: <1881418853@web.de> Hello, I do not know Roberto's lecture; but I guess that it refers to problem no. 14190 in Die Schwalbe 238 (August 2009), which is "inspired by A.C. Jobim". By the way: When I saw the problem (and the solution), I thought that a dedication to Albert Einstein (="One-Stone") might also have been appropriate... Have a nice week! Bernd > -----Urspr?ngliche Nachricht----- > Von: "Joost de Heer" > Gesendet: 26.10.09 00:13:15 > An: The Retrograde Analysis Mailing List > Betreff: [Retros] Lecture in Rio > From the bulletin: > > LECTURES, OCT 12 > A Proofgame inspired by Antonio Carlos Jobim > Roberto OSORIO (Argentina) > > What was this lecture about? Roberto, do you have an electronic version > of the lecture? > _______________________________________________ > Retros mailing list > Retros at janko.at > http://www.pairlist.net/mailman/listinfo/retros > ______________________________________________________ GRATIS f?r alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de From raosorio at fibertel.com.ar Mon Oct 26 19:30:01 2009 From: raosorio at fibertel.com.ar (raosorio at fibertel.com.ar) Date: Mon, 26 Oct 2009 20:30:01 -0300 Subject: [Retros] Lecture in Rio / A Proofgame inspired by Antonio Carlos Jobim Message-ID: <822f1c381ab41.4ae606c9@fibertel.com.ar> Hi Joost, Bernd is wright. This Lecture was about the problem published as no. 14190 in Die Schwalbe 238 (August 2009). It was presented there since it was published as "dedicated to the Rio Meeting" (the comments explain why). The PG is, ------------------------------------------------------------------------------------------------- Roberto Osorio & Jorge Lois Argentine Inspired by Antonio Carlos Jobim, dedicated to Enzo Minerva and to the Rio 2009 Meeting k5n1/pppp1ppp/bRn5/2bP4/q1B5/1NrP1N1Q/PPPB1PP1/R4r1K PG in 19.0 moves CIRCE ------------------------------------------------------------------------------------------------- I'm including at the end of this message the solution and comments (Thomas will surely excuse me). I do recomend to listen first the Jobim's song which the PG is inspired in (as it was presented in Rio), http://www.youtube.com/watch?v=h_sHT_LdgNk Best, Roberto Solution ---------------------------------------------------------------------------------------- 1.h4, g5 2.hxg5(g2), b6 3.Rh6, Ba6 4.Rxb6(b7), h5 5.e4, Rh6 6.Qxh5(h7), Rc6 7.Nf3, Rc3 8.Bf4, d5 9.d3, Qd7 10.Nd2, Qa4 11.Nb3, Nc6 12.Bd2, O-O-O 13.Qh3+, f5 14.gxf5 e.p(f7), Kb8 15.fxe7, Ka8 16.e8=R, Rxa8(Rh1) 17.O-O, Bc5 18.exd5(d7), Re1 19.Kh1, Rxf1+ --------------------------------------------------------------------------------------- Authors, "One man Valladao". The h2 pawn shows all the special chess moves: Pawn double step, e.p. capture, promotion and castling. We got into the Valladao theme thanks to the Minerva's Jubilee (2008/09). This rendition in particular was inspired by an Antonio Carlos Jobim's song. Jobim is an emblematic brazilian composser, having songs like "The girl from Ipanema", "Corcovado",etc, that were interpretated for, for instance, Frank Sinatra, Ella Fitzgerald, Andy Williams, etc. One of his most famous songs is "Samba de uma nota so" (One note Samba), where the melody is notably displayed by the same note taking care of all the job. This PG would be "Valladao de uma peza so"(One man Valladao). A problem dedicated to the Rio 2009 Meeting. From joost at sanguis.xs4all.nl Tue Oct 27 09:29:45 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Tue, 27 Oct 2009 14:29:45 +0100 Subject: [Retros] Probleemblad 3-2009 (Jul-Sep) Message-ID: <4AE6F5C9.4090703@sanguis.xs4all.nl> R352 - Unto Heinonen rs1qk1sr/p1pp3p/4p2B/6P1/5p2/2P2P2/3P1PP1/Rb2K1S1 (10+13) +---+---+---+---+---+---+---+---+ |*R |*S | |*Q |*K | . |*S |*R | +---+---+---+---+---+---+---+---+ |*P | |*P |*P | . | | . |*P | +---+---+---+---+---+---+---+---+ | | . | | . |*P | . | | B | +---+---+---+---+---+---+---+---+ | . | | . | | . | | P | | +---+---+---+---+---+---+---+---+ | | . | | . | |*P | | . | +---+---+---+---+---+---+---+---+ | . | | P | | . | P | . | | +---+---+---+---+---+---+---+---+ | | . | | P | | P | P | . | +---+---+---+---+---+---+---+---+ | R |*B | . | | K | | S | | +---+---+---+---+---+---+---+---+ SPG 12.0 R353 - Michel Caillaud rs1qks1r/ppp1pp1p/5p2/8/8/P1P1b2b/P2PPP2/RS2KBSR (12+15) +---+---+---+---+---+---+---+---+ |*R |*S | |*Q |*K |*S | |*R | +---+---+---+---+---+---+---+---+ |*P |*P |*P | |*P |*P | . |*P | +---+---+---+---+---+---+---+---+ | | . | | . | |*P | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | P | | P | |*B | | . |*B | +---+---+---+---+---+---+---+---+ | P | . | | P | P | P | | . | +---+---+---+---+---+---+---+---+ | R | S | . | | K | B | S | R | +---+---+---+---+---+---+---+---+ SPG 17.0 R354 - Silvio Baier 8/p4ppq/sb1pk1s1/p1p2pp1/3P4/3b1rr1/P1P2PP1/RSBQKBSR (13+16) +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ |*P | | . | | . |*P |*P |*Q | +---+---+---+---+---+---+---+---+ |*S |*B | |*P |*K | . |*S | . | +---+---+---+---+---+---+---+---+ |*P | |*P | | . |*P |*P | | +---+---+---+---+---+---+---+---+ | | . | | P | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . |*B | . |*R |*R | | +---+---+---+---+---+---+---+---+ | P | . | P | . | | P | P | . | +---+---+---+---+---+---+---+---+ | R | S | B | Q | K | B | S | R | +---+---+---+---+---+---+---+---+ SPG 24.5 R355 - Silvio Baier rsbqkbsr/p1p2pp1/2P2RR1/2Qp4/6P1/P1BPSP1S/P3KPP1/1B6 (16+13) +---+---+---+---+---+---+---+---+ |*R |*S |*B |*Q |*K |*B |*S |*R | +---+---+---+---+---+---+---+---+ |*P | |*P | | . |*P |*P | | +---+---+---+---+---+---+---+---+ | | . | P | . | | R | R | . | +---+---+---+---+---+---+---+---+ | . | | Q |*P | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | P | . | +---+---+---+---+---+---+---+---+ | P | | B | P | S | P | . | S | +---+---+---+---+---+---+---+---+ | P | . | | . | K | P | P | . | +---+---+---+---+---+---+---+---+ | . | B | . | | . | | . | | +---+---+---+---+---+---+---+---+ SPG 25.0 R356 - Harry Goldsteen 8/8/7p/PP1P4/kr1rP3/BbKpRP2/S2PppP1/qSqRbB2 (14+11) +---+---+---+---+---+---+---+---+ | | . | | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | | . | | . | | . | | +---+---+---+---+---+---+---+---+ | | . | | . | | . | |*P | +---+---+---+---+---+---+---+---+ | P | P | . | P | . | | . | | +---+---+---+---+---+---+---+---+ |*K |*R | |*R | P | . | | . | +---+---+---+---+---+---+---+---+ | B |*B | K |*P | R | P | . | | +---+---+---+---+---+---+---+---+ | S | . | | P |*P |*P | P | . | +---+---+---+---+---+---+---+---+ |*Q | S |*Q | R |*B | B | . | | +---+---+---+---+---+---+---+---+ Mate? R357 - Wolfgang Dittmann kS1s4/ppB5/1pP5/1P6/p6p/1P3K1P/5PP1/s5b1 (9+9) +---+---+---+---+---+---+---+---+ |*K | S | |*S | | . | | . | +---+---+---+---+---+---+---+---+ |*P |*P | B | | . | | . | | +---+---+---+---+---+---+---+---+ | |*P | P | . | | . | | . | +---+---+---+---+---+---+---+---+ | . | P | . | | . | | . | | +---+---+---+---+---+---+---+---+ |*P | . | | . | | . | |*P | +---+---+---+---+---+---+---+---+ | . | P | . | | . | K | . | P | +---+---+---+---+---+---+---+---+ | | . | | . | | P | P | . | +---+---+---+---+---+---+---+---+ |*S | | . | | . | |*B | | +---+---+---+---+---+---+---+---+ -9 & #1 Proca retractor, Anticirce (R352-R355 are C+) SOLUTIONS 2008-4 R345 - Faybish 1. e3 a6 2. Bb5 axb5 3. c4 Rxa2 4. Nc3 Ra8 5. Ra6 bxa6 6. Qa4 bxa4 7. Nb5 axb5 8. cxb5 Na6 9. bxa6 This is not an SPG: 1. e3 a6 2. Bb5 axb5 3. c4 Rxa2 4. Na3 Rxa3 5. cxb5 Ra8 6. Ra6 Nxa6 7. bxa6 b5 8. Qa4 bxa4 R346 - Dupont 1. h4 c5 2. Rh3 Qb6 3. Rg3 Qb3 4. Rg6 hxg6 5. axb3 Rh5 6. Ra6 Rd5 7. Rc6 a5 8. h5 a4 9. h6 a3 10. h7 a2 11. h8=R a1=Q 12. Rh1 Qa5 13. Rxc8+ Qd8 14. Rc6 Qc7 15. Nh3 Qh2 16. f4 Qg1 17. Nf2 Qxf1+ 18. Rxf1 A Pronkin (Qd8) captured by a Pronkin (Rh1). R347 - Baier 1. a4 c6 2. a5 Qb6 3. axb6 d5 4. Ra5 Bh3 5. Rb5 a5 6. gxh3 a4 7. h4 a3 8. Nh3 a2 9. Rg1 Ra3 10. Rg5 Rc3 11. dxc3 a1=R 12. Qd4 Ra8 13. Qc5 d4 14. Bf4 d3 15. e3 d2+ 16. Ke2 d1=B+ 17. Kd3 Bg4 18. Bc7 Bc8 19. Re5 g5 20. Kc4 g4 21. Kb4 g3 22. Bc4 g2 23. Ba2 g1=Q 24. b3 Qd1 25. Ng1 Qd8 Pronkin qrb. R348 - Goldsteen The white pawns captured 5 times (bxc5, cxb, exd, fxe3 and gxf3), the black at least twice (exd, dxc1). The black h-pawn is also captured by a white pawn, or is still on the board as a promoted piece. So the third black capture is hxg. The black g-pawn also promoted on g1, without capture. So white can't take back g2xf3 until black unpromoted twice. Solution: Last move was d2xQc1=Q#. Start from 8/p2p4/k7/2P5/PPpP1S2/rp1PPP2/SRQprp1P/1KBqb3 (14+11) and play 1. b5+ Ka5 2. Nc3 Kb4 3. a5 Ra4 4. Nfd5+ Ka3 5. Ka1 Rb4 6. Nb1+ Ka4 7. Qc3 Qc2 8. Na3 Qd1 9. Rb1 Qc2 10. Bb2 Qd1 11. Nc2 Qc1 12. Ba3 Qd1 13. Qb2 Qc1 14. Qa2 Qd1 15. Kb2 Qc1+ 16. Kc3 Qd1 17. Rb2 Qb1 18. Qa1 Qa2 19. Qd1 Qb1 20. Na1 Qa2 21. Rc2 Qb1 22. Bc1 Qa2 23. Rb2 Ka3 24. Qc2 Ra4 25. Nb4 Qb1 26. Na2 Rb4 27. Qd1 Ka4 28. Nc2 Qa1 29. Na3 Qb1 30. Rc2 Qa1+ 31. Bb2 Qc1 32. Ba1 Qb1 33. Rb2 Qc1+ 34. Qc2 Qd1 35. Qb1 Qc1+ 36. Rc2 Qd1 37. Bb2 Qc1 38. Qa1 Qb1 39. Nc1 Qa2 40. Qb1 Qa1 41. Qa2 Qb1 42. Ba1 b2 43. Nb3 Qc1 44. Qb1 Qd1 45. Rc1 d6 46. Qc2 d5 47. Rb1 a6 48. Qc1 dxc1=Q# Try: Last move was d2xRc1=Q#. Further retroplay: -2. Rc2-c1 a7-a6 -3. Sc1-b3 b3-b2 -4. Sa2-c1 Qc1-d1 -5. Bb2-a1 Qd1-c1 -6. Ra1-b1 Qb1-d1 -7. Sc1-a2 Qa2-b1 -8. Rb1-a1 Qa1-a2 -9. Sa2-c1 d6-d5 -10. Rd1-b1 Qb1-a1 -11. Sc1-a2 Qa2-b1 -12. Ba1-b2 Qb1-a2 -13. Rb2-c2 Qa2-b1 -14. Sc2-a3 Qa3-a2 -15. Rb1-b2 Qa2-a3 -16. Bb2-a1 Qa1-a2 -17. Ba3-b2 Qa2-a1 -18. Rb2-b1 Qa1-a2 -19. Sa2-c1 Qc1-a1 -20. Sa1-c2 Qb1-c1 -21. Rc2-b2 Qc1-b1 -22. Bb2-a3 Qb1-c1 -23. Bc1-b2 Ka3-a4 -24. Rb2-c2 Ra4-b4 -25. Sb4-a2 d7-d6 -26. Sd5-b4 and black has no retromove, so the try fails on one black retro-tempo. From nbeluhov at abv.bg Thu Oct 29 14:01:15 2009 From: nbeluhov at abv.bg (=?UTF-8?B?0J3QuNC60L7Qu9Cw0Lkg0JHQtdC70YPRhdC+0LI=?=) Date: Thu, 29 Oct 2009 20:01:15 +0200 (EET) Subject: [Retros] The Case of the Mysterious Moves Message-ID: <1204766671.170437.1256839275238.JavaMail.apache@mail72.abv.bg> Dear retro-friends, I would like to present to you a translation of one interesting short story found in one old issue of a Russian chess composition magazine (and the issue itself was found in the cabinet of my math teacher, but this is a completely different story, really). It deals with one quite bizarre and interesting chess puzzle - not exactly orthodox retroanalysis, but something along the lines of an unusual proof game. I hope you will enjoy it as much as I did! Just in case there is some problem with the attached file, here are two backup files in different filehosting sites: http://ifolder.ru/14737510 http://www.mediafire.com/file/uhmkmjecmka/The_Case_of_the_Mysterious_Moves.pdf Please write to me at "nbeluhov(at)abv.bg" with any notes, corrections, similar puzzles, etc. Best wishes, Nikolai ----------------------------------------------------------------- ?????? ???????? ?? ????? ????? ? ??????????????????? ????????????? http://pay.kabinata.com/go.php?r=4809&i=10 -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: The_Case_of_the_Mysterious_Moves.pdf Type: application/pdf Size: 89200 bytes Desc: not available Url : From g.wilts at mnet-online.de Fri Oct 30 18:56:07 2009 From: g.wilts at mnet-online.de (Gerd Wilts) Date: Fri, 30 Oct 2009 23:56:07 +0100 Subject: [Retros] The Case of the Mysterious Moves In-Reply-To: <1204766671.170437.1256839275238.JavaMail.apache@mail72.abv.bg> Message-ID: Dear Nikolai, this is indeed a very interesting puzzle, thank you for posting it! But I must have missed some important point: why isn't the following also a solution: 1. c3 d5 2. Qa4+ b5 3. e4 dxe4 4. Qxa7 Dxd2+ 5. Kxd2 e3+ 6. Ke1 exf2+ 7. Kxf2 e6 8. Bxb5+ c6 9. Bxc6+ Kd8 10. Qxa8 Sxc6 11. Lg5+ f6 12. Qxc8+ Ke7 13. Qxe6+ Kxe6 14. Sf3 Bc5+ 15. Sd4+ Sxd4 16. cxd4 h5 17. Lxf6 Rh6 18. Sa3 Rxf6+ 19. Kg1 Bxd4# There are many more similar solutions. Best wishes, Gerd -----Urspr?ngliche Nachricht----- Von: retros-bounces at janko.at [mailto:retros-bounces at janko.at]Im Auftrag von ??????? ??????? Gesendet: Donnerstag, 29. Oktober 2009 19:01 An: retros at janko.at Betreff: [Retros] The Case of the Mysterious Moves Dear retro-friends, I would like to present to you a translation of one interesting short story found in one old issue of a Russian chess composition magazine (and the issue itself was found in the cabinet of my math teacher, but this is a completely different story, really). It deals with one quite bizarre and interesting chess puzzle - not exactly orthodox retroanalysis, but something along the lines of an unusual proof game. I hope you will enjoy it as much as I did! Just in case there is some problem with the attached file, here are two backup files in different filehosting sites: http://ifolder.ru/14737510 http://www.mediafire.com/file/uhmkmjecmka/The_Case_of_the_Mysterious_Moves.pdf Please write to me at "nbeluhov(at)abv.bg" with any notes, corrections, similar puzzles, etc. Best wishes, Nikolai ----------------------------------------------------------------- ?????? ???????? ?? ????? ????? ? ??????????????????? ????????????? -------------- next part -------------- An HTML attachment was scrubbed... URL: From nbeluhov at abv.bg Sat Oct 31 12:50:44 2009 From: nbeluhov at abv.bg (=?UTF-8?B?0J3QuNC60L7Qu9Cw0Lkg0JHQtdC70YPRhdC+0LI=?=) Date: Sat, 31 Oct 2009 18:50:44 +0200 (EET) Subject: [Retros] The Case of the Mysterious Moves Message-ID: <1747150883.200213.1257007844353.JavaMail.apache@mail71.abv.bg> Dear Gerd, I don't believe that you have missed a point - it is possible that the second puzzle is cooked. I myself only solved the easier one, which is incorporated into the story (and I was so impressed with it that I just took the author's word for the harder one). If this is indeed so, I sincerely apologize for posting an unsound problem! I don't think these two need to be the last problems of their kind; but it seems now (as I suspected, and you confirmed) that it is very hard indeed to create a completely determined game which does not make use of castling. Hopefully, some interested and skilled composer could accomplish this in the future - either by repairing the old mechanism or designing an entirely new one. Best wishes, Nikolai -------------- next part -------------- An HTML attachment was scrubbed... URL: From joost at sanguis.xs4all.nl Sat Oct 31 13:51:11 2009 From: joost at sanguis.xs4all.nl (Joost de Heer) Date: Sat, 31 Oct 2009 18:51:11 +0100 Subject: [Retros] The Case of the Mysterious Moves In-Reply-To: <1747150883.200213.1257007844353.JavaMail.apache@mail71.abv.bg> References: <1747150883.200213.1257007844353.JavaMail.apache@mail71.abv.bg> Message-ID: <4AEC790F.8080200@sanguis.xs4all.nl> The first game is slightly dualistic (e7-e6 could've been e7-e5 too), since Holmes couldn't have deduced that f5xe6 is an ep capture. Joost