[Retros] Twisted knights

[raosorio at fibertel.com.ar]

Hi NIcolas,
After seeing your PG I wonder if the length could be reduced accepting a promoted
piece on the board. Kindly note that in our first PG the thematic lenght is 15.5 too,
since the last move is just to benefit the diagram.

This is a logical task: to minimyze the thematic pìeces'movements and total lenght.

On the contrary, I want to remark that Gianni got the opposite record with his very good
entry to the Jorge Lois' 60th JT (12 knight moves without capture)

Gianni Donatti
JL60JT, Special Prize
1nqk1bnr/P1ppp1pp/QpRrR1BP/4N3/1K4P1/2PP1P2/1pNB2P1/8
15+14   Proof game in 28.0 moves

1.h4 f5  2.h5  f4  3.h6  f3  4.exf3  Nc6  5.Bd3  Ne5  6.Bg6+  Nf7  7.d3  a5  8.Kd2  a4  9.Kc3  a3  10.Bd2  axb2  
11.a4  Ra6  12.a5  Rd6  13.a6  Nf6  14.a7  Ng4  15.Ra6  Ne5  16.Na3 Nc6  17.Qa1  Nb8  18.Rc6  b6  19.Kb4  Ba6  20.c3  Bc4  21.Nc2  Be6  22.Qa6  Bg4  23.fxg4  Qc8  24.Nf3  Kd8  25.Re1   Ng5  26.Re6  Ne4  27.Ne5  Nf6  28.f3  Ng8

Interchange of Nb8 and Ng8, requiring 12 thematic moves.  There exists a pg with 14 thematic moves 
(P0000107 by Kornilov/Frolkin), but these moves include captures.  See also P0001572 by Frolkin with 
12 N moves with captures, and P0002337 by van Atten with 10 N moves without captures.  

Best,
Roberto

Nicolas Dupont wrote,
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Very interesting ! Mine is unpublishable (horrible visible promoted 
knight), unless if it is the shortest length record, but I doubt about 
that. 

1.Pd2-d3 Pc7-c5 2.Fc1-f4 Dd8-a5 3.Cb1-d2 Pb7-b6 
4.Pe2-e3 Fc8-b7 5.Cg1-e2 Fb7xg2 6.Th1-g1 Fg2-h3 
7.Tg1-g6 Pc5-c4 8.Tg6-f6 Pe7xf6 9.Ta1-b1 Ff8-a3 
10.Pb2xa3 Pc4-c3 11.Tb1-b2 Pc3xb2 12.Ce2-c3 Pb2-b1=C 
13.Cd2-f3 Cb1-d2 14.Cf3-g1 Cd2-f3 15.Re1-e2 Cf3-h4 
16.Cc3-b1 
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raosorio at fibertel.com.ar raosorio at fibertel.com.ar 
Fri May 2 23:17:02 EDT 2008 

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Hi Nicolas, 

We worked this matter during 2006 and published in Problem Paradise a couple 
of PGs, not focussed on shortest length record but in the 6 knight moves to get the 
sibling and the complementary play strategy. 

I reproduce here the sending to Satoshi, 

*********************************************************************************** 
We made a research on the PDB and found that there are 15 PGs that show 
a mutual sibling of knights. We made the following technical evaluation: 

a) The arguments of all of them to justify the siblings are a central pawn capture 
or check protection. 
b) In these PGs the knigths move 8-12 times. There are no antecedents in the PDB of 
mutual sibling using just 6 moves, wich could be named as the "standard 
mechanism" in the sense of WCCC Halkidiki 2004. 
c) The homebase position is, in some cases, reached by the sibling side but 
not the oposite one. 

The Pgs we are sending here make the sibling in the standard way (6 moves) and the 
argument is the oposite side promotion instead of captures or check protection. 

----------------------------------------------------------------------------------------------------------- 
Jorge Lois & Roberto Osorio 
Argentina 
rsbqkbsr/p1p1p1pp/B4Q2/8/2P1PP2/P1p3K1/P6P/RSB3SR 
32 single moves C+ 

Solution 
1.Pe2-e4 Pf7-f5 2.Bf1-a6 Pf5-f4 3.Pc2-c4 Pf4-f3 
4.Sb1-c3 Pf3xg2 5.Qd1-f3 Pb7-b5 6.Qf3-f6 Pb5-b4 
7.Pf2-f4 Pb4-b3 8.Sg1-f3 Pg2-g1=B 9.Sc3-e2 Bg1-c5 
10.Se2-g1 Bc5-a3 11.Pb2xa3 Pb3-b2 12.Ke1-f2 Pb2-b1=S 
13.Kf2-g3 Sb1-c3 14.Pd2xc3 Pd7-d5 15.Sf3-d2 Pd5-d4 
16.Sd2-b1 Pd4xc3 

Mutual NN sibling (6 moves) motivated by double Ceriani-Frolkin with promotions on 
the knights' home squares. Black side finished officer homebase. 

------------------------------------------------------------------------------------------------ 
Jorge Lois & Roberto Osorio 
Argentina 
1s1qb1sr/p1p2p1p/p2k1p1p/3p3r/8/2P5/PP2PP1P/RSBQKB1R 
39 single moves. 13 + 15 C+ 

Solution 
1.Pd2-d4 Sb8-c6 2.Qd1-d3 Ra8-b8 3.Qd3-a6 Pb7xa6 
4.Sg1-f3 Rb8-b5 5.Sf3-h4 Rb5-h5 6.Sh4-f5 Pd7-d5 
7.Sf5-h6 Pg7xh6 8.Pg2-g4 Bf8-g7 9.Pg4-g5 Bg7-e5 
10.Pg5-g6 Sg8-f6 11.Pg6-g7 Sf6-d7 12.Pg7-g8=S Sd7-b8 
13.Sg8-f6 Pe7xf6 14.Pd4xe5 Sc6-e7 15.Pe5-e6 Se7-g8 
16.Pe6-e7 Ke8-d7 17.Pe7-e8=Q Kd7-d6 18.Qe8-a4 Bc8-d7 
19.Pc2-c3 Bd7-e8 20.Qa4-d1 

Mutual NN sibling (6 moves) with Phenix/Ceriani-Frolkin and Pronkin. 
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