Author: Heiner Marxen
Date: 10:08:00 02/16/04
Go up one level in this thread
On February 16, 2004 at 12:25:54, F. Huber wrote: >Hi, > >I´ve just found out, that the last position in the included file ´Mate.epd´ >seems to have an error - there should be a white pawn at e4! > >So please delete this line and replace it with the following correct line: > >8/kPp5/2P3p1/p1P1p1P1/2PpPp2/3p1p2/3P1P2/5K2 w - - bm #50; 00:00 @ C-/K2/P2/X6; > >At the same time this corrected position is the new Chest record - >a mate in 50 in 0 sec! > >Try it with the following settings: >ProblemType=Special-Mate >ChecksOnly=off >KingMobility=2 >PieceLimit=2 >MaxMoves=6 > >ChestUCI Ver.3.3 UCI: > >CPU: Celeron 400MHz >FEN: 8/kPp5/2P3p1/p1P1p1P1/2PpPp2/3p1p2/3P1P2/5K2 w - - >Search for Special-Mate [C-/K2/P2/X6] in 50 ... (Hash=48MB) >50 00:01 M50 1.Ke1 >Search completed ... (Time=0.93s) >Special-Mate in 50 found ! (00:00) >1.Ke1 Kb8 2.Kd1 Ka7 3.Kc1 Kb8 4.Kb1 Ka7 5.Kb2 Kb8 6.Kb3 Ka7 7.Ka4 Kb8 >8.Kxa5 Ka7 9.Ka4 Kb8 10.Ka3 Ka7 11.Kb2 Kb8 12.Kc1 Ka7 13.Kd1 Kb8 14.Ke1 Ka7 >15.Kf1 Kb8 16.Kg1 Ka7 17.Kh2 Kb8 18.Kh3 Ka7 19.Kg4 Kb8 20.Kxf3 Ka7 21.Kg2 Kb8 >22.Kf1 Ka7 23.Ke1 Kb8 24.Kd1 Ka7 25.Kc1 Kb8 26.Kb2 Ka7 27.Kb3 Kb8 28.Kb4 Ka7 >29.Kb5 Kb8 30.Ka6 f3 31.Ka5 Ka7 32.Kb5 Kb8 33.Kb4 Ka7 34.Kb3 Kb8 35.Kb2 Ka7 >36.Kc1 Kb8 37.Kd1 Ka7 38.Ke1 Kb8 39.Kf1 Ka7 40.Kg1 Kb8 41.Kh2 Ka7 42.Kg3 Kb8 >43.Kxf3 Ka7 44.Kg4 Kb8 45.f4 Ka7 46.fxe5 Kb8 47.e6 Ka7 48.e7 Ka6 49.b8Q Ka5 >50.Qb5# >1 Solution (Special-Mate in 50) > >Regards, >Franz. Wow! I'm impressed! The normal brute force search (currently) is completely hopeless here: it reaches depths around 25 but nothing remotely near the needed 50. Although it already uses a special heuristic, invented for exactly _this_ very problem. Thanks for making Chest look much more powerful! :-) Cheers, Heiner
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