Author: Angrim
Date: 13:40:28 07/07/01
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On July 06, 2001 at 18:30:08, Heiner Marxen wrote: <snip> >>>proved that move g5xg7 wins, 11 turns >>>PN2:2020634 evals, 39222 expands, 13.15 seconds >>> >>>pv starts with g5xg7+ f7xg7 c4g8+ g7xg8 b3xg8+ >>>Angrim >> >>I tried to verify this, but failed. I assume "11 turns" does mean a mate in >>11 moves. After the above 5 plies there is only one legal move left. >>Hence I started Chest after 1.Qxg7+ Q7xg7 2.Qg8+ Qxg8 3.Qbxg8+ Bxg8, searching >>for a mate in 8 (8 == 11-3). But according to Chest, there is no mate in 8 >>(K7/600, 350 MB hash, 435 secs). I have used this FEN: >>R1N1N2k/2qqqqbb/1nQ2q1r/2Q2qQ1/1nQ2q2/1QQQQq1r/1BB5/K5QR w - - starting with this fen, and applying the moves: 1.Qxg7+ Q7xg7 2.Qg8+ Qxg8 3.Qbxg8+ Bxg8 gives the position: fen R1N1N1bk/2qqq3/1nQ2q1r/2Q2q2/1n3q2/2QQQq1r/1BB5/K5QR w - - from which my program says that 4. Qxg8+ wins in 9 turns. blacks reply Kxg8 is then forced then 5. c8xe7+ is the next move. fen R3N1k1/2qqN3/1nQ2q1r/2Q2q2/1n3q2/2QQQq1r/1BB5/K6R b - - 0 2 then Kf7 is fairly forced then 6. c3xf6+ is the next move.(score win in 6 turns, don't check my math;) Hope you can find the win from here, otherwise one of our programs has a bug. Angrim > >There is not even one in 9 moves, here (again, according to Chest). > >Heiner > >>Where did I go wrong? Or did I misunderstand? >> >>Heiner
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