Author: Peter McKenzie
Date: 00:25:53 10/08/00
Go up one level in this thread
On October 07, 2000 at 23:45:01, Ricardo Gibert wrote: >On October 07, 2000 at 22:51:43, Peter McKenzie wrote: > >>On October 07, 2000 at 19:32:18, Vincent Diepeveen wrote: >> >>>On October 07, 2000 at 15:16:17, Peter McKenzie wrote: >>> >>>>The position where the solution is most in doubt: >>>> >>>>[D]2k2K2/8/pp6/2p5/2P5/PP6/8/8 w - - >>>> >>>>The authors say that after 1.Ke8 Kc7 2.Ke7, black draws by 2...b5 with a >>>>stalemate motif after 3.Ke6 b4 4.a4 Kb6. >>> >>>nice motif for humans. peanut for the computer to see. >>>however, after 1.a4 i get a 0.00 score from diep initially, >>>now there are sure some bugs in this version, as i'm busy rewriting >>>its hashing to 64 bits (which asks for bugs of course), but 0.00 is >>>pretty hard. it is basically doubting between 0.50 and 0.00 on most >>>plies. where the stalemate position is 50 moves of shuffling around >>>with king and score +1.31. this version not showing +3.x scores weirdly. >>> >>>what is the win with a4 which i'm missing? and 20 plies of search too, >> >>Lines given start with: >> >>1.a4 b5 2.a5 >> >>1.a4 Kd7 (1..b5 2.a5) 2.a5 >>2...Kd6 (or b5 or bxa5) 3.Kf7 >>2...Ke6 (or d8) 3.axb6, 4.b7 >> >>I don't want to type lots of big variations, but if you think Diep has found a >>defence then please post it so we can analyse it. > > >I quickly generated the following with assistance from Fritz4: > >1.a4 Kd7 2.a5 Kd6 > >[2...Ke6? 3.axb6 Kd7 4.b7 Kc7 5.Ke7 Kxb7 6.Kd7 Kb6 7.Kc8 Kc6 8.Kb8 Kb6 9.Ka8 a5 >10.Kb8 a4 11.bxa4 Ka5 12.Kc7 Kxa4 13.Kd6 Kb4 14.Kd5+-] > >3.Kf7 > >[3.Ke8 bxa5 4.Kd8 a4 5.bxa4 Ke5 6.Kc7 Kd4 7.Kb6 Kxc4 8.Kxa6 Kb4 9.a5 c4 10.Kb6=; >3.axb6 Kc6 4.Ke7 Kxb6 5.Kd6 Ka5 6.Kxc5=] > >3...Kd7 4.axb6 Kc6 5.Ke7 Kxb6 6.Kd6 Ka5= > >[7.Kc6? Kb4 8.Kb6 a5 9.Kc6 Kxb3-+] Instead of 4.axb6, the book gives the following line: 4.Kf6 Kd6 5.Kf5 Kc7 (5...Ke7 6.axb6 Kd6 7.b7 Kc7 8.Ke6 Kxb7 9.Kd7, 5...Kd7 6.Ke5 Kc6 7.Ke6) 6.Ke6 Kc6 7.Ke7 Kc7 8.Ke8 Kc8 9.axb6 Kb7 10.Kd7 Kxb6 11.Kc8 and apparently black is in zugzwang. <snip>
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