Author: John Merlino
Date: 14:42:40 05/21/05
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On May 21, 2005 at 11:16:37, Steven Edwards wrote: >On May 21, 2005 at 10:54:12, David Dahlem wrote: > >>What's the shortest forced mate from this position, and can any engine find it >>without tablebases? >> >>[D]2KB4/1P6/2k5/8/8/8/7b/8 w - - 0 1 > >1. Bg5 Kb5 2. Be3 Ka6 3. Bc5 Be5 4. Be7 Kb5 5. Bd8 Kc6 6. Bf6 Bc7 7. Bd4 Bd6 8. >Ba7 Be5 9. Bb8 Bd4 10. Bc7 Ba7 11. Bf4 Kb5 12. Be3 Bxe3 13. b8=Q+ Kc4 14. Kd7 >Kd5 15. Qb3+ Kd4 16. Ke6 Bd2 17. Qa4+ Kd3 18. Kd5 Bc3 19. Qa3 Kd2 20. Kc4 Bf6 >21. Qd3+ Ke1 22. Qc2 Kf1 23. Kd3 Bb2 24. Ke3 Bc1+ 25. Kf3 Bd2 26. Qxd2 Kg1 27. >Qg2# 1-0 Both 1.Bg5 and 1.Bh4 lead to a mate in 27. Here's how Chessmaster plays it out: [White "Chessmaster"] [Black "Chessmaster"] [Result "1-0"] [Setup "1"] [FEN "2KB4/1P6/2k5/8/8/8/7b/8 w - - 0 1"] 1.Bh4 Kb5 2.Bf2 Ka6 3.Bc5 Bg3 4.Be7 Kb5 5.Bd8 Kc6 6.Bh4 Bf4 7.Bf2 Bd6 8.Ba7 Be5 9.Bb8 Bd4 10.Bc7 Ba7 11.Bf4 Kb5 12.Be3 Bxe3 13.b8=Q+ Kc4 14.Kd7 Kd5 15.Qd6+ Ke4 16.Ke6 Bd4 17.Qb4 Kd3 18.Kd5 Bf6 19.Qd6 Bg7 20.Qg3+ Ke2 21.Qxg7 Kf3 22.Qe5 Kf2 23.Qf4+ Ke1 24.Qh2 Kf1 25.Ke4 Ke1 26.Ke3 Kf1 27.Qh1# 1-0 jm
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