Author: Mike Byrne
Date: 19:18:25 10/16/03
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On October 16, 2003 at 18:50:32, William Kerr wrote: > >Worlds toughest until someone finds a tougher one. > >After timing engines solving many mates in four, this one was by far the >toughest. > >[D] 8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3;id #1097 mate in 4 >very-very tough; > >This is a composed mate in 4 problem from Benko's Baffler's #1097. > >Most engines take a very long time to find the mate in 4. > >For PC programs with no CPU speed mentioned were run on a P2 300 Mhz. >Morphy was from the Great Game system 6502 at 2 Mhz. > >m6 = anounced mate in 6 >no solve is usually 10 minutes > >Chessmaster 9000 6:14 m11, 8:51 m6, 9:59 m4 >crafty no solve >pocket fritz < 44 sec >yace < 7 min m11, 26:30 m4 >ruffian 1.0.0 no solve >bringer 15 min no solve >rebel10 17 sec m6, 37 sec m4 >uscf 5 sec >morphy 5:27 >rebel12 no solve 7:00 >ruffian 1.0.1 1:53 m11 >fritz532 3:21 m8 Nc3 >pocket genius 3 min no solve >pocket grandmaster 6 min Ne3 +12.26 12/51 >extreme 2:54 m6 16/34 >doctor3 15 sec m4 >sargon4 5 sec m4 (old PC chess program) >lg2kv2.7 10 min no solve >wkchess 33 sec >yacepdb 30 sec m4 >Novag sapphire ii 1:33 m5 >Novag star diamond 0:55 m5 >Chessmaster 9000 1.7 Ghz AMD 0:42 m11, 0:59 m6, 1:06 m4 > >Post a tougher one than this if you know of one. > >Bill Dell Axim (o/c 472 Mhz) Pocket Chess Genius 1.5 16 MB Hash 4,628,616 positions 84,156 nps The position below took Pocket Chess Genius 48 minutes on the same unit. [d]5rk1/pprbbp2/2np3Q/4p1P1/4P3/2qBB3/P1P3P1/3R1R1K w - - 0 27 Even "The King" took 1 minute and 6 seconds on my machine 1.7 Ghz P4 Xeon == to about 1.2 Ghz P3 for Chess (ss=12) The position came from this game - using the Trojan Horse trap (Ng5 followed by h5 after h6) against Genius [Event "Game/5"] [Site "Dell Axim 400 Mhz"] [Date "2003.10.16"] [Round "?"] [White "Michael Byrne"] [Black "Chess Genius"] [Result "1-0"] 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4 Nc6 7. Nf3 Qa5 8. Bd3 Be7 9. O-O Qc5+ 10. Kh1 O-O 11. Qe1 Qh5 12. Be2 Qa5 13. Bd2 Qc5 14. Rd1 Bd7 15. Bd3 Rac8 16. Be3 Qb4 17. Ng5 h6 18. h4 hxg5 19. hxg5 Ng4 20. Bd2 e5 21. f5 Qxb2 22. Qh4 Ne3 23. Bxe3 Qxc3 24. f6 Rc7 25. fxg7 Kxg7 26. Qh6+ Kg8 27. Rf6 Be8 28. Rdf1 Qe1 29. g6 Qh4+ 30. Qxh4 fxg6 31. Bc4+ d5 32. Bxd5+ Rf7 33. Rxg6+ Kf8 34. Qh8# 1-0 I actually did not see I had mate until I played Bc4+. I belive this position is easier for humans. One - he is behind and has to do something. Two, Bxf6 is out of the question and allows Rdf1 which is a real problem.
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