From edderiofer at hotmail.com Thu Oct 1 11:19:57 2020 From: edderiofer at hotmail.com (Edderiofer He) Date: Thu, 1 Oct 2020 15:19:57 +0000 Subject: [Retros] Discord Message-ID: Hi all, Otto recently posted about the Discord server I set up for chess problems. Just letting you all know that this Discord is for constructed chess problems of all sorts; mate problems, studies, retros, fairy problems, and anything else that I've forgotten about. My current aim is to grow the Discord, and I'll deal with spamming and other unkindliness as it happens. As such, this Discord is open to everybody and can be joined via this link: http://discord.me/chessproblems The reason I decided to set up this server is that I only know of two forums specifically for discussing chess problems, MatPlus.Net and ChessProblem.Net, and both require an administrator to activate one's account before allowing one to post. This makes it difficult for newcomers to properly participate in the forums (it took me a week of waiting and sending an email to the ChessProblem admin for me to be able to post there, and I'm still unable to post on MatPlus despite emailing the admin there). That's why my server aims to be fully accessible, to encourage newcomers into the problemist community. At the moment we actually have 20-something users already; there's some discussion every day with people posting either original problems or our favourite problems from other sources. However, most of us aren't that hardcore into problemism(?) and we would really appreciate some higher-level discussion regarding themes, construction techniques, etc. As for the puzzle server, that one I can confirm is invite-only. I was originally going to also post a synthetic puzzle I'd just composed myself, but turns out it's cooked. Regardless, how does one normally check if a synthetic puzzle (or other retro) is original? --Edd. -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Sun Oct 25 07:05:51 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Sun, 25 Oct 2020 12:05:51 +0100 Subject: [Retros] A single red unit Message-ID: <0325AF91-5DE5-4A02-9085-24586E69F084@skynet.be> Hello Retro fans, rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR Say a ? red ? unit is a chess unit that moved more than once during the game. What is the minimum number of moves needed to reach the above FEN diagram where only one of the 30 units is red? Best, ?. From markenfooyw at gmail.com Sun Oct 25 11:16:38 2020 From: markenfooyw at gmail.com (Marken Foo) Date: Sun, 25 Oct 2020 23:16:38 +0800 Subject: [Retros] A single red unit In-Reply-To: <0325AF91-5DE5-4A02-9085-24586E69F084@skynet.be> References: <0325AF91-5DE5-4A02-9085-24586E69F084@skynet.be> Message-ID: Hello all, It seems like a promoted unit has to be interpreted as a "fresh" non-red unit, so I have 13.0 moves: 1. a4 a5 2. Ra3 Ra6 3. Rb3 Rc6 4. Rb5 Rc4 5. Rxa5 Rb4 6. Rb5 Rc4 7. a5 Rb4 8. a6 Rc4 9. a7 Rb4 10. a8=R Rc4 11. Ra1 Rb4 12. Rba5 Ra4 13. Ra8 Rxa8 Sincerely, Marken On Sun, 25 Oct 2020 at 19:05, ?ric Angelini wrote: > Hello Retro fans, > > rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR > > Say a ? red ? unit is a chess unit that moved more than once during the > game. > > What is the minimum number of moves needed to reach the above FEN diagram > where only one of the 30 units is red? > > Best, > ?. > > > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Sun Oct 25 11:22:24 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Sun, 25 Oct 2020 16:22:24 +0100 Subject: [Retros] A single red unit In-Reply-To: References: Message-ID: <08B512E9-5C11-494E-AB24-C4DEF612F249@skynet.be> Yep! BTW, on a scale 0 to 10 (easy/ not easy) how would you judge this? (me: 2/10) Best, ?. Catapult? de mon aPhone > Le 25 oct. 2020 ? 16:17, Marken Foo a ?crit : > > ? > Hello all, > > It seems like a promoted unit has to be interpreted as a "fresh" non-red unit, so I have 13.0 moves: > 1. a4 a5 2. Ra3 Ra6 3. Rb3 Rc6 4. Rb5 Rc4 5. Rxa5 Rb4 > 6. Rb5 Rc4 7. a5 Rb4 8. a6 Rc4 9. a7 Rb4 > 10. a8=R Rc4 11. Ra1 Rb4 12. Rba5 Ra4 13. Ra8 Rxa8 > > Sincerely, > Marken > > >> On Sun, 25 Oct 2020 at 19:05, ?ric Angelini wrote: >> Hello Retro fans, >> >> rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR >> >> Say a ? red ? unit is a chess unit that moved more than once during the game. >> >> What is the minimum number of moves needed to reach the above FEN diagram where only one of the 30 units is red? >> >> Best, >> ?. >> >> >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros -------------- next part -------------- An HTML attachment was scrubbed... URL: From markenfooyw at gmail.com Sun Oct 25 11:30:11 2020 From: markenfooyw at gmail.com (Marken Foo) Date: Sun, 25 Oct 2020 23:30:11 +0800 Subject: [Retros] A single red unit In-Reply-To: <08B512E9-5C11-494E-AB24-C4DEF612F249@skynet.be> References: <08B512E9-5C11-494E-AB24-C4DEF612F249@skynet.be> Message-ID: Hi ?ric, A difficulty of 1 or 2 sounds right, since it's just playing with 4 out of 32 units... Sincerely, Marken On Sun, 25 Oct 2020, 23:22 ?ric Angelini, wrote: > Yep! > BTW, on a scale 0 to 10 (easy/ not easy) > how would you judge this? > (me: 2/10) > Best, > ?. > Catapult? de mon aPhone > > > Le 25 oct. 2020 ? 16:17, Marken Foo a ?crit : > > ? > Hello all, > > It seems like a promoted unit has to be interpreted as a "fresh" non-red > unit, so I have 13.0 moves: > 1. a4 a5 2. Ra3 Ra6 3. Rb3 Rc6 4. Rb5 Rc4 5. Rxa5 Rb4 > 6. Rb5 Rc4 7. a5 Rb4 8. a6 Rc4 9. a7 Rb4 > 10. a8=R Rc4 11. Ra1 Rb4 12. Rba5 Ra4 13. Ra8 Rxa8 > > Sincerely, > Marken > > > On Sun, 25 Oct 2020 at 19:05, ?ric Angelini > wrote: > >> Hello Retro fans, >> >> rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR >> >> Say a ? red ? unit is a chess unit that moved more than once during the >> game. >> >> What is the minimum number of moves needed to reach the above FEN diagram >> where only one of the 30 units is red? >> >> Best, >> ?. >> >> >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Sun Oct 25 11:45:43 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Sun, 25 Oct 2020 16:45:43 +0100 Subject: [Retros] A single red unit In-Reply-To: References: Message-ID: <8E79B092-5B38-4E72-BFB3-6F8D1662B991@skynet.be> Agree, thanks Marken! ?+ ?. Catapult? de mon aPhone > Le 25 oct. 2020 ? 16:30, Marken Foo a ?crit : > > ? > Hi ?ric, > > A difficulty of 1 or 2 sounds right, since it's just playing with 4 out of 32 units... > > Sincerely, > Marken > >> On Sun, 25 Oct 2020, 23:22 ?ric Angelini, wrote: >> Yep! >> BTW, on a scale 0 to 10 (easy/ not easy) >> how would you judge this? >> (me: 2/10) >> Best, >> ?. >> Catapult? de mon aPhone >> >> >>>> Le 25 oct. 2020 ? 16:17, Marken Foo a ?crit : >>>> >>> ? >>> Hello all, >>> >>> It seems like a promoted unit has to be interpreted as a "fresh" non-red unit, so I have 13.0 moves: >>> 1. a4 a5 2. Ra3 Ra6 3. Rb3 Rc6 4. Rb5 Rc4 5. Rxa5 Rb4 >>> 6. Rb5 Rc4 7. a5 Rb4 8. a6 Rc4 9. a7 Rb4 >>> 10. a8=R Rc4 11. Ra1 Rb4 12. Rba5 Ra4 13. Ra8 Rxa8 >>> >>> Sincerely, >>> Marken >>> >>> >>>> On Sun, 25 Oct 2020 at 19:05, ?ric Angelini wrote: >>>> Hello Retro fans, >>>> >>>> rnbqkbnr/1ppppppp/8/8/8/8/1PPPPPPP/RNBQKBNR >>>> >>>> Say a ? red ? unit is a chess unit that moved more than once during the game. >>>> >>>> What is the minimum number of moves needed to reach the above FEN diagram where only one of the 30 units is red? >>>> >>>> Best, >>>> ?. >>>> >>>> >>>> >>>> _______________________________________________ >>>> Retros mailing list >>>> Retros at janko.at >>>> https://pairlist1.pair.net/mailman/listinfo/retros >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros -------------- next part -------------- An HTML attachment was scrubbed... URL: From abrobecker at yahoo.com Tue Oct 27 14:27:54 2020 From: abrobecker at yahoo.com (Alain BROBECKER) Date: Tue, 27 Oct 2020 18:27:54 +0000 (UTC) Subject: [Retros] PG 4.0 for the game Polyssimo Challenge References: <3702226.338840.1603823274780.ref@mail.yahoo.com> Message-ID: <3702226.338840.1603823274780@mail.yahoo.com> Dear Retro-fans, Two years ago my game Polyssimo Challenge was published. It is a tactical/geometrical game with polyminoes for 2 to 4 players,you can have more infos (videos, strategy guide, solitaire challanges) here: http://abrobecker.free.fr/jeux/index.htm#polyssimochallenge I write to the retro mailing list because I just created a Proof Game for it,that you can find here:? http://abrobecker.free.fr/jeux/PolyssimoChallenge_ProofGames.pdf... and I thought it might interest some of you? Also you are welcome to create some more (PG 5.0 or more, different stipulations...),that I would be very happy to add in the .pdf! ;-) Best regards, Alain -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Wed Oct 28 13:51:14 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Wed, 28 Oct 2020 18:51:14 +0100 Subject: [Retros] Where are the 3 missing pawns Message-ID: Hello Retro?s fans, this is more a chess puzzle than a retro composition, please pardon me ? but the coming lockdown in Brussels has confused me, sorry (I hope the puzzle is sound though): r3k2r/8/8/8/8/PPPPPPPP/RNBQKBNR/8 The above FEN position was reached after ply 22.5 of an orthodox chess game. But 3 pawns are missing in the diagram: where are they? Best, ?. Catapult? de mon aPhone From eric.angelini at skynet.be Thu Oct 29 08:53:28 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Thu, 29 Oct 2020 13:53:28 +0100 Subject: [Retros] Cornice Chess fun Message-ID: Hello Retros? friends, more puzzles from lockdowned Brussels. ? Cornice Chess ? (CC) allows only movements that end on ranks 1 and 8 or columns a and h (the opening 1. Nc3 is forbidden but not the Sodium Attack 1. Na3) What is the length of the shortest CC game ending in: 1) 0-0 2) NxB 3) BxN 4) BxB Best, ?. From markenfooyw at gmail.com Thu Oct 29 13:35:03 2020 From: markenfooyw at gmail.com (Marken Foo) Date: Fri, 30 Oct 2020 01:35:03 +0800 Subject: [Retros] Cornice Chess fun In-Reply-To: References: Message-ID: Hi again ?ric, Not particularly sure on some parts, but I got: 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 Sincerely, Marken On Thu, 29 Oct 2020 at 20:53, ?ric Angelini wrote: > Hello Retros? friends, > more puzzles from lockdowned Brussels. > ? Cornice Chess ? (CC) allows only movements > that end on ranks 1 and 8 or columns a and h > (the opening 1. Nc3 is forbidden but not the > Sodium Attack 1. Na3) > > What is the length of the shortest CC game ending in: > 1) 0-0 > 2) NxB > 3) BxN > 4) BxB > Best, > ?. > > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From murtagh.jack at gmail.com Thu Oct 29 13:51:53 2020 From: murtagh.jack at gmail.com (Jack Murtagh) Date: Thu, 29 Oct 2020 13:51:53 -0400 Subject: [Retros] Cornice Chess fun In-Reply-To: References: Message-ID: Here is an improvement on part 1. A way to end on 0-0 in 7.0: 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rh5 Sh6 6.Rxh6 Bxh6 7. ~ 0-0 On Thu, Oct 29, 2020 at 1:35 PM Marken Foo wrote: > Hi again ?ric, > > Not particularly sure on some parts, but I got: > 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ > 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. > 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ > 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 > 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 > h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 > 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B > 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 > > Sincerely, > Marken > > On Thu, 29 Oct 2020 at 20:53, ?ric Angelini > wrote: > >> Hello Retros? friends, >> more puzzles from lockdowned Brussels. >> ? Cornice Chess ? (CC) allows only movements >> that end on ranks 1 and 8 or columns a and h >> (the opening 1. Nc3 is forbidden but not the >> Sodium Attack 1. Na3) >> >> What is the length of the shortest CC game ending in: >> 1) 0-0 >> 2) NxB >> 3) BxN >> 4) BxB >> Best, >> ?. >> >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Thu Oct 29 14:00:37 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Thu, 29 Oct 2020 19:00:37 +0100 Subject: [Retros] Cornice Chess fun Message-ID: ? ? ?Hi Marken, 1) is possible in 7.0 2) is possible in 9.5 3) is possible in 11.0 4) is the same as mine ... and now for: 5) earliest MATE 6) earliest DRAW 7) earliest MATE by a PAWN (I have 13.5 but it might be bettered) 8) earliest MATE by a KING (I have 13.5) ?+ ?. Catapult? de mon aPhone >> Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : > ? > Hi again ?ric, > > Not particularly sure on some parts, but I got: > 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. > 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 > 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 > 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 > > Sincerely, > Marken > >> On Thu, 29 Oct 2020 at 20:53, ?ric Angelini wrote: >> Hello Retros? friends, >> more puzzles from lockdowned Brussels. >> ? Cornice Chess ? (CC) allows only movements >> that end on ranks 1 and 8 or columns a and h >> (the opening 1. Nc3 is forbidden but not the >> Sodium Attack 1. Na3) >> >> What is the length of the shortest CC game ending in: >> 1) 0-0 >> 2) NxB >> 3) BxN >> 4) BxB >> Best, >> ?. >> >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros -------------- next part -------------- An HTML attachment was scrubbed... URL: From murtagh.jack at gmail.com Thu Oct 29 14:54:49 2020 From: murtagh.jack at gmail.com (Jack Murtagh) Date: Thu, 29 Oct 2020 14:54:49 -0400 Subject: [Retros] Cornice Chess fun In-Reply-To: References: Message-ID: Hi ?ric and Marken, Here's mate in 7.5: 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8# On Thu, Oct 29, 2020 at 2:00 PM ?ric Angelini wrote: > ? > ? > ?Hi Marken, > 1) is possible in 7.0 > 2) is possible in 9.5 > 3) is possible in 11.0 > 4) is the same as mine > ... and now for: > 5) earliest MATE > 6) earliest DRAW > 7) earliest MATE by a PAWN (I have 13.5 but > it might be bettered) > 8) earliest MATE by a KING (I have 13.5) > > ?+ > ?. > Catapult? de mon aPhone > > > Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : > > ? > Hi again ?ric, > > Not particularly sure on some parts, but I got: > 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ > 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. > 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ > 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 > 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 > h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 > 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B > 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 > > Sincerely, > Marken > > On Thu, 29 Oct 2020 at 20:53, ?ric Angelini > wrote: > >> Hello Retros? friends, >> more puzzles from lockdowned Brussels. >> ? Cornice Chess ? (CC) allows only movements >> that end on ranks 1 and 8 or columns a and h >> (the opening 1. Nc3 is forbidden but not the >> Sodium Attack 1. Na3) >> >> What is the length of the shortest CC game ending in: >> 1) 0-0 >> 2) NxB >> 3) BxN >> 4) BxB >> Best, >> ?. >> >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Thu Oct 29 15:21:39 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Thu, 29 Oct 2020 20:21:39 +0100 Subject: [Retros] Cornice Chess fun In-Reply-To: References: Message-ID: <1A7FA1FB-8BD4-4570-B965-0400430F7F26@skynet.be> Yep! ?+ ?. Catapult? de mon aPhone > Le 29 oct. 2020 ? 19:55, Jack Murtagh a ?crit : > > ? > Hi ?ric and Marken, > > Here's mate in 7.5: > > 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8# > >> On Thu, Oct 29, 2020 at 2:00 PM ?ric Angelini wrote: >> ? >> ? >> ?Hi Marken, >> 1) is possible in 7.0 >> 2) is possible in 9.5 >> 3) is possible in 11.0 >> 4) is the same as mine >> ... and now for: >> 5) earliest MATE >> 6) earliest DRAW >> 7) earliest MATE by a PAWN (I have 13.5 but >> it might be bettered) >> 8) earliest MATE by a KING (I have 13.5) >> >> ?+ >> ?. >> Catapult? de mon aPhone >> >> >>>> Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : >>>> >>> ? >>> Hi again ?ric, >>> >>> Not particularly sure on some parts, but I got: >>> 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. >>> 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 >>> 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 >>> 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 >>> >>> Sincerely, >>> Marken >>> >>>> On Thu, 29 Oct 2020 at 20:53, ?ric Angelini wrote: >>>> Hello Retros? friends, >>>> more puzzles from lockdowned Brussels. >>>> ? Cornice Chess ? (CC) allows only movements >>>> that end on ranks 1 and 8 or columns a and h >>>> (the opening 1. Nc3 is forbidden but not the >>>> Sodium Attack 1. Na3) >>>> >>>> What is the length of the shortest CC game ending in: >>>> 1) 0-0 >>>> 2) NxB >>>> 3) BxN >>>> 4) BxB >>>> Best, >>>> ?. >>>> >>>> >>>> _______________________________________________ >>>> Retros mailing list >>>> Retros at janko.at >>>> https://pairlist1.pair.net/mailman/listinfo/retros >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros -------------- next part -------------- An HTML attachment was scrubbed... URL: From markenfooyw at gmail.com Fri Oct 30 01:46:20 2020 From: markenfooyw at gmail.com (Marken Foo) Date: Fri, 30 Oct 2020 13:46:20 +0800 Subject: [Retros] Cornice Chess fun In-Reply-To: <1A7FA1FB-8BD4-4570-B965-0400430F7F26@skynet.be> References: <1A7FA1FB-8BD4-4570-B965-0400430F7F26@skynet.be> Message-ID: Hello again, 3) BxN in 11.0: 1.a4 ~ 2.Ra3 ~ 3.Rh3 ~ 4.Rxh7 Rxh7 5.h4 Rh8 6.h5 ~ 7.h6 ~ 8.h7 ~ 9.Rh6 gxh6 10.hxg8S ~ 11.S*h6 Bxh6 6) Stalemate in 7.5: 1.a4 h5 2.a5 h4 3.a6 Rh5 4.Ra4 Sh6 5.Rxh4 Ra5 6.Rxh6 Rh5 7.Rxh5 bxa6 8.Ra5= Earliest draw is technically 3-fold repetition (draw when white writes their 5th move - not black's 4th) or 5-fold repetition. 7) Mate by a pawn (if promotion counts) in 11.0: 1.h4 a5 2.h5 Ra6 3.h6 Rxh6 4. ~ Rxh1 5. ~ Rxg1 6. ~ Rxf1+ 7. Kxf1 h5 8. ~ h4 9. ~ h3 10. ~h2 11. ~ h1Q# 8) Mate by a king in 13.0: 1.a4 a5 2.Ra3 Ra7 3.Rh3 Ra6 4.Rxh7 Rh6 5.Rxh8 Rxh2 6.Rxg8 Rxh1 7.Rxf8+ Kxf8 8.Sa3 Rxg1 9.Sb1 Rxf1+ 10.Kxf1 Kg8 11.Kg1 Kh7 12.Kh2 Qh8 13.Qg1 Kg8# Marken On Fri, 30 Oct 2020 at 03:21, ?ric Angelini wrote: > Yep! > > ?+ > ?. > Catapult? de mon aPhone > > > Le 29 oct. 2020 ? 19:55, Jack Murtagh a ?crit : > > ? > Hi ?ric and Marken, > > Here's mate in 7.5: > > 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8# > > On Thu, Oct 29, 2020 at 2:00 PM ?ric Angelini > wrote: > >> ? >> ? >> ?Hi Marken, >> 1) is possible in 7.0 >> 2) is possible in 9.5 >> 3) is possible in 11.0 >> 4) is the same as mine >> ... and now for: >> 5) earliest MATE >> 6) earliest DRAW >> 7) earliest MATE by a PAWN (I have 13.5 but >> it might be bettered) >> 8) earliest MATE by a KING (I have 13.5) >> >> ?+ >> ?. >> Catapult? de mon aPhone >> >> >> Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : >> >> ? >> Hi again ?ric, >> >> Not particularly sure on some parts, but I got: >> 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ >> 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. >> 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ >> 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 >> 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 >> 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 >> 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B >> 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 >> >> Sincerely, >> Marken >> >> On Thu, 29 Oct 2020 at 20:53, ?ric Angelini >> wrote: >> >>> Hello Retros? friends, >>> more puzzles from lockdowned Brussels. >>> ? Cornice Chess ? (CC) allows only movements >>> that end on ranks 1 and 8 or columns a and h >>> (the opening 1. Nc3 is forbidden but not the >>> Sodium Attack 1. Na3) >>> >>> What is the length of the shortest CC game ending in: >>> 1) 0-0 >>> 2) NxB >>> 3) BxN >>> 4) BxB >>> Best, >>> ?. >>> >>> >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >>> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... URL: From eric.angelini at skynet.be Fri Oct 30 01:52:03 2020 From: eric.angelini at skynet.be (=?utf-8?Q?=C3=89ric_Angelini?=) Date: Fri, 30 Oct 2020 06:52:03 +0100 Subject: [Retros] Cornice Chess fun In-Reply-To: References: Message-ID: <5DA9D03F-D597-4AD9-A780-C42B412CF91A@skynet.be> Hello Marken, Mario Richter tells me CC is a rediscovery of the Edge-mover fairy condition: https://bit.ly/3mEX9vf He is currently computer-checking a few minimal lengths ? I will study your claims later today. Many thanks for yr post! Best, ?. > Le 30 oct. 2020 ? 06:46, Marken Foo a ?crit : > > ? > Hello again, > > 3) BxN in 11.0: 1.a4 ~ 2.Ra3 ~ 3.Rh3 ~ 4.Rxh7 Rxh7 5.h4 Rh8 6.h5 ~ 7.h6 ~ 8.h7 ~ 9.Rh6 gxh6 10.hxg8S ~ 11.S*h6 Bxh6 > 6) Stalemate in 7.5: 1.a4 h5 2.a5 h4 3.a6 Rh5 4.Ra4 Sh6 5.Rxh4 Ra5 6.Rxh6 Rh5 7.Rxh5 bxa6 8.Ra5= > Earliest draw is technically 3-fold repetition (draw when white writes their 5th move - not black's 4th) or 5-fold repetition. > 7) Mate by a pawn (if promotion counts) in 11.0: 1.h4 a5 2.h5 Ra6 3.h6 Rxh6 4. ~ Rxh1 5. ~ Rxg1 6. ~ Rxf1+ 7. Kxf1 h5 8. ~ h4 9. ~ h3 10. ~h2 11. ~ h1Q# > 8) Mate by a king in 13.0: 1.a4 a5 2.Ra3 Ra7 3.Rh3 Ra6 4.Rxh7 Rh6 5.Rxh8 Rxh2 6.Rxg8 Rxh1 7.Rxf8+ Kxf8 8.Sa3 Rxg1 9.Sb1 Rxf1+ 10.Kxf1 Kg8 11.Kg1 Kh7 12.Kh2 Qh8 13.Qg1 Kg8# > > Marken > > >> On Fri, 30 Oct 2020 at 03:21, ?ric Angelini wrote: >> Yep! >> >> ?+ >> ?. >> Catapult? de mon aPhone >> >> >>>> Le 29 oct. 2020 ? 19:55, Jack Murtagh a ?crit : >>>> >>> ? >>> Hi ?ric and Marken, >>> >>> Here's mate in 7.5: >>> >>> 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8# >>> >>>> On Thu, Oct 29, 2020 at 2:00 PM ?ric Angelini wrote: >>>> ? >>>> ? >>>> ?Hi Marken, >>>> 1) is possible in 7.0 >>>> 2) is possible in 9.5 >>>> 3) is possible in 11.0 >>>> 4) is the same as mine >>>> ... and now for: >>>> 5) earliest MATE >>>> 6) earliest DRAW >>>> 7) earliest MATE by a PAWN (I have 13.5 but >>>> it might be bettered) >>>> 8) earliest MATE by a KING (I have 13.5) >>>> >>>> ?+ >>>> ?. >>>> Catapult? de mon aPhone >>>> >>>> >>>>>> Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : >>>>>> >>>>> ? >>>>> Hi again ?ric, >>>>> >>>>> Not particularly sure on some parts, but I got: >>>>> 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. >>>>> 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 >>>>> 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 >>>>> 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 >>>>> >>>>> Sincerely, >>>>> Marken >>>>> >>>>>> On Thu, 29 Oct 2020 at 20:53, ?ric Angelini wrote: >>>>>> Hello Retros? friends, >>>>>> more puzzles from lockdowned Brussels. >>>>>> ? Cornice Chess ? (CC) allows only movements >>>>>> that end on ranks 1 and 8 or columns a and h >>>>>> (the opening 1. Nc3 is forbidden but not the >>>>>> Sodium Attack 1. Na3) >>>>>> >>>>>> What is the length of the shortest CC game ending in: >>>>>> 1) 0-0 >>>>>> 2) NxB >>>>>> 3) BxN >>>>>> 4) BxB >>>>>> Best, >>>>>> ?. >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Retros mailing list >>>>>> Retros at janko.at >>>>>> https://pairlist1.pair.net/mailman/listinfo/retros >>>>> _______________________________________________ >>>>> Retros mailing list >>>>> Retros at janko.at >>>>> https://pairlist1.pair.net/mailman/listinfo/retros >>>> _______________________________________________ >>>> Retros mailing list >>>> Retros at janko.at >>>> https://pairlist1.pair.net/mailman/listinfo/retros >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros -------------- next part -------------- An HTML attachment was scrubbed... URL: From markenfooyw at gmail.com Fri Oct 30 03:22:08 2020 From: markenfooyw at gmail.com (Marken Foo) Date: Fri, 30 Oct 2020 15:22:08 +0800 Subject: [Retros] Cornice Chess fun In-Reply-To: <5DA9D03F-D597-4AD9-A780-C42B412CF91A@skynet.be> References: <5DA9D03F-D597-4AD9-A780-C42B412CF91A@skynet.be> Message-ID: Hello again, I improved the stalemate to 7.0: 1.a4 h5 2.a5 Rh6 3.a6 Rxa6 4.Sa3 Rxa3 5.Ra2! Rh3 6.gxh3 h4 7.Ra6 Sxa6= Unfortunately the last 2.0 moves are not unique. Marken On Fri, 30 Oct 2020 at 13:52, ?ric Angelini wrote: > Hello Marken, > Mario Richter tells me CC is a rediscovery > of the Edge-mover fairy condition: > > https://bit.ly/3mEX9vf > > He is currently computer-checking a few > minimal lengths ? I will study your claims > later today. Many thanks for yr post! > Best, > ?. > > > Le 30 oct. 2020 ? 06:46, Marken Foo a ?crit : > > ? > Hello again, > > 3) BxN in 11.0: 1.a4 ~ 2.Ra3 ~ 3.Rh3 ~ 4.Rxh7 Rxh7 5.h4 Rh8 6.h5 ~ 7.h6 ~ > 8.h7 ~ 9.Rh6 gxh6 10.hxg8S ~ 11.S*h6 Bxh6 > 6) Stalemate in 7.5: 1.a4 h5 2.a5 h4 3.a6 Rh5 4.Ra4 Sh6 5.Rxh4 Ra5 6.Rxh6 > Rh5 7.Rxh5 bxa6 8.Ra5= > Earliest draw is technically 3-fold repetition (draw when white writes > their 5th move - not black's 4th) or 5-fold repetition. > 7) Mate by a pawn (if promotion counts) in 11.0: 1.h4 a5 2.h5 Ra6 3.h6 > Rxh6 4. ~ Rxh1 5. ~ Rxg1 6. ~ Rxf1+ 7. Kxf1 h5 8. ~ h4 9. ~ h3 10. ~h2 11. > ~ h1Q# > 8) Mate by a king in 13.0: 1.a4 a5 2.Ra3 Ra7 3.Rh3 Ra6 4.Rxh7 Rh6 5.Rxh8 > Rxh2 6.Rxg8 Rxh1 7.Rxf8+ Kxf8 8.Sa3 Rxg1 9.Sb1 Rxf1+ 10.Kxf1 Kg8 11.Kg1 Kh7 > 12.Kh2 Qh8 13.Qg1 Kg8# > > Marken > > > On Fri, 30 Oct 2020 at 03:21, ?ric Angelini > wrote: > >> Yep! >> >> ?+ >> ?. >> Catapult? de mon aPhone >> >> >> Le 29 oct. 2020 ? 19:55, Jack Murtagh a ?crit : >> >> ? >> Hi ?ric and Marken, >> >> Here's mate in 7.5: >> >> 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 ~ 5.Rxh7 Bh6 6.Rxh6 ~ 7.Rxh8 ~ 8.Rxg8# >> >> On Thu, Oct 29, 2020 at 2:00 PM ?ric Angelini >> wrote: >> >>> ? >>> ? >>> ?Hi Marken, >>> 1) is possible in 7.0 >>> 2) is possible in 9.5 >>> 3) is possible in 11.0 >>> 4) is the same as mine >>> ... and now for: >>> 5) earliest MATE >>> 6) earliest DRAW >>> 7) earliest MATE by a PAWN (I have 13.5 but >>> it might be bettered) >>> 8) earliest MATE by a KING (I have 13.5) >>> >>> ?+ >>> ?. >>> Catapult? de mon aPhone >>> >>> >>> Le 29 oct. 2020 ? 18:36, Marken Foo a ?crit : >>> >>> ? >>> Hi again ?ric, >>> >>> Not particularly sure on some parts, but I got: >>> 1) 0-0 in 9.0: e.g. 1.h4 ~ 2.h5 ~ 3.h6 gxh6 4.Rxh6 Sxh6 5.a4 ~ 6. Ra3 ~ >>> 7.Rh3~ 8.Rxh6 Bxh6 9. ~ 0-0. >>> 2) NxB in 10.0 e.g. 1.h4 ~ 2.Rh3 ~ 3.Ra3 ~ 4.Rxa7 Rxa7 5.a4 Ra8 6.a5 ~ >>> 7.a6 ~ 8.a7 Sa6 9. ~ Rb8 10.axb8B Sxb8 >>> 3) BxN in 12.0 e.g. 1.h4 a5 2.Rh3 Ra6 3.Ra3 Rh6 4.Rxa5 Rxh4 5.Ra8 Rh1 >>> 6.a4 h5 7.a5 h4 8.a6 h3 9.a7 h2 10.axb8S ~ 11.R8a6 bxa6 12.Sxa6 Bxa6 >>> 4) BxB in 13.5 e.g. Same first 9.0 as 3), then 10.Rxb8 Rxg1 11.a8B h1B >>> 12.Ra6 Rh3 13.gxh3 bxa6 14.Bxh1 >>> >>> Sincerely, >>> Marken >>> >>> On Thu, 29 Oct 2020 at 20:53, ?ric Angelini >>> wrote: >>> >>>> Hello Retros? friends, >>>> more puzzles from lockdowned Brussels. >>>> ? Cornice Chess ? (CC) allows only movements >>>> that end on ranks 1 and 8 or columns a and h >>>> (the opening 1. Nc3 is forbidden but not the >>>> Sodium Attack 1. Na3) >>>> >>>> What is the length of the shortest CC game ending in: >>>> 1) 0-0 >>>> 2) NxB >>>> 3) BxN >>>> 4) BxB >>>> Best, >>>> ?. >>>> >>>> >>>> _______________________________________________ >>>> Retros mailing list >>>> Retros at janko.at >>>> https://pairlist1.pair.net/mailman/listinfo/retros >>>> >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >>> >>> _______________________________________________ >>> Retros mailing list >>> Retros at janko.at >>> https://pairlist1.pair.net/mailman/listinfo/retros >>> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> >> _______________________________________________ >> Retros mailing list >> Retros at janko.at >> https://pairlist1.pair.net/mailman/listinfo/retros >> > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > > _______________________________________________ > Retros mailing list > Retros at janko.at > https://pairlist1.pair.net/mailman/listinfo/retros > -------------- next part -------------- An HTML attachment was scrubbed... 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