Author: John Merlino
Date: 11:14:54 02/08/00
Go up one level in this thread
On February 07, 2000 at 15:06:06, Vincent Lejeune wrote: >3 hard positions, if you want to torture your favourite chessengine for long >minutes ... >White to play and win!, The keymove is unique for each one. >N°1 will cause serious problem for nullmover >Solution below ... > >Good work ! ;) > >[D] 2k1r3/3q4/8/8/8/8/5RK1/6Q1 w - - >[D] 8/8/1P3P2/8/8/8/8/b2nk2K w - - >[D] 7Q/3k2p1/6p1/8/1K2Np2/8/8/5q2 w - - > > > > > > >[Event "?"] >[Site "?"] >[Date "????.??.??"] >[Round "?"] >[White "1"] >[Black "?"] >[Result "*"] >[SetUp "1"] >[FEN "2k1r3/3q4/8/8/8/8/5RK1/6Q1 w - - 0 10"] >[PlyCount "21"] > >10. Rc2+ Kb8 11. Rb2+ Ka8 12. Qa1+ Qa7 13. Qh1 $3 Rb8 14. Kh2+ Rb7 15. Qd5 Qb8+ >16. Kg2 Qc7 17. Ra2+ Kb8 18. Qg8+ Qc8 19. Ra8+ Kxa8 20. Qxc8+ * > > >[Event "?"] >[Site "?"] >[Date "????.??.??"] >[Round "?"] >[White "2"] >[Black "?"] >[Result "*"] >[SetUp "1"] >[FEN "8/8/1P3P2/8/8/8/8/b2nk2K w - - 0 1"] >[PlyCount "10"] > >1. f7 Kf1 2. Kh2 Nf2 3. Kg3 Ne4+ 4. Kf4 Nc5 5. b7 Nd7 * > > >[Event "?"] >[Site "?"] >[Date "????.??.??"] >[Round "?"] >[White "3"] >[Black "?"] >[Result "*"] >[SetUp "1"] >[FEN "7Q/3k2p1/6p1/8/1K2Np2/8/8/5q2 w - - 0 1"] >[PlyCount "35"] > >1. Nc5+ Kd6 2. Qb8+ Kd5 3. Qg8+ Kd4 4. Qe6 Qh1 5. Qd6+ Ke3 6. Qe5+ Kf2 7. Nd3+ >Kg2 8. Nxf4+ Kg3 9. Qg5+ Kf2 10. Qc5+ Kg3 11. Ne2+ Kg4 12. Qd4+ Kh3 13. Qe3+ >Kg2 14. Nf4+ Kf1 15. Qe2+ Kg1 16. Qe1+ Kh2 17. Qf2+ Qg2 18. Qxg2# * Chessmaster's opinion is as follows: -- On number 1, Chessmaster finds a different move for Black that is a more difficult win for White. Instead of 13...Rb8, The King chooses 13...Qe3. I let Chessmaster think for about 27 minutes (to a depth of 7/10 -- admittedly, not very far) on my P2-400 on the position following 13...Qe3, and the result was: 14. Kh2+ Re4 15.Ra2+ Kb7 16.Qb1+ Kc7 17.Rc2+ Kd6 18.Qb8+ ...which is a win for white (18...Ke7 19.Rc7+ Ke6 20.Qe8+ Kf5 21.Qh5+ Qg5 22.Rc5+ Re5 23.Rxe5 Kxe5 24. Qxg5+ etc...). So, in a sense, Chessmaster found the win, but preferred a different reply for black. -- On Number 2, Chessmaster finds the winning combination in about 10 seconds. -- On Number 3, Chessmaster first sees the obvious Qxg7+, but after 2:08 switches to the winning combination. jm
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