Author: Roy Eassa
Date: 11:28:35 05/07/02
Go up one level in this thread
On May 07, 2002 at 14:18:50, Dann Corbit wrote: >On May 05, 2002 at 13:55:00, Heiner Marxen wrote: > >>On April 28, 2002 at 22:00:22, Heiner Marxen wrote: >> >>>On April 28, 2002 at 18:18:38, Heiner Marxen wrote: >>> >>>>On April 28, 2002 at 08:00:15, Vincent Vega wrote: >>>> >>>>>Simplified position to show the bug: >>>>>[D]8/8/8/8/8/8/4KP2/R1Qn3k w - - 0 1 >>>>> >>>>>This is a mate in 2 (1. Qxd1+). >>>>> >>>>>But CHEST says: >>>>> >>>>>CHEST version 3.19, 18-Dec-1999 >>>>>Input file: 'xx' >>>>>Reading job: >>>>># xx >>>>>W: Ke2 Qc1 Ra1 Pf2 (4) >>>>>B: Kh1 Nd1 (2) >>>>>FEN: 8/8/8/8/8/8/4KP2/R1Qn3k w - - >>>>>analysing (mate in 2 moves): >>>>>No solution in 2 moves. >>>>>refu 1: Qxd1+ -- [ 1-] M2: move >>>>>refu 2: Qc6+ -- [ 1-] M2: move >>>>>refu 3: Qh6+ Kg1 [ 1-] >>>>>refu 4: f3 -- [ 1-] M2: move >>>>>refu 5: f4 -- [ 1-] M2: move >>>>>refu 6: Rb1 -- [ 1-] M2: move >>>>>refu 7: Ra2 -- [ 1-] M2: move >>>>>refu 8: Ra3 -- [ 1-] M2: move >>>>>refu 9: Ra4 -- [ 1-] M2: move >>>>>refu 10: Ra5 -- [ 1-] M2: move >>>>>refu 11: Ra6 -- [ 1-] M2: move >>>>>refu 12: Ra7 -- [ 1-] M2: move >>>>>refu 13: Ra8 -- [ 1-] M2: move >>>>>refu 14: Qb1 -- [ 1-] M2: move >>>>>refu 15: Qc2 -- [ 1-] M2: move >>>>>refu 16: Qc3 -- [ 1-] M2: move >>>>>refu 17: Qc4 -- [ 1-] M2: move >>>>>refu 18: Qc5 -- [ 1-] M2: move >>>>>refu 19: Qc7 Kg1 [ 1-] >>>>>refu 20: Qc8 -- [ 1-] M2: move >>>>>refu 21: Qd2 -- [ 1-] M2: move >>>>>refu 22: Qe3 -- [ 1-] M2: move >>>>>refu 23: Qf4 Kg1 [ 1-] >>>>>refu 24: Qg5 -- [ 1-] M2: move >>>>>refu 25: Qb2 -- [ 1-] M2: move >>>>>refu 26: Qa3 -- [ 1-] M2: move >>>>>refu 27: Kd2 -- [ 1-] M2: move >>>>>refu 28: Ke1 -- [ 1-] M2: move >>>>>refu 29: Kf3 -- [ 1-] M2: move >>>>>refu 30: Kxd1 -- [ 1-] M2: move >>>>>refu 31: Kf1 Ne3+ [ 1-] >>>>>refu 32: Kd3 -- [ 1-] M2: move >>>>>Time (virt) = 0.000 sec >>>> >>>>Sadly, I have to confirm this fact: this is a bug in Chest. >>>>If I specify option "-2" to suppress the "2-mate-heuristic", it finds the >>>>mate in 2: >>>> >>>> Qxd1+ Kh2 Qh1# >>>> Kg2 Qh1# >>>> >>>>Hence, the bug is in the "mate2" module. Since that one is a really complex >>>>one, it will take some time to track it down. >>>>When I have found it, I will report under what circumstances it does appear. >>> >>>Fortunately, I could track down this bug. >> >>[snip] >>>It is quite easy to correct this bug, and within the next week I will >>>provide a corrected source module. >>>It will be announced here, and be available through my web page. >> >> http://www.drb.insel.de/~heiner/Chess/chest.html >> >>contains a reference to the corrected source code "mate2.c": >> >> http://www.drb.insel.de/~heiner/Chess/mate2.c >> >>>Hopefully Dann will then provide a corrected win32 executable. >>>Since the circumstances for the bug to occur are not really very rare, >>>I'd recommend upgrading to the new version when available. >> >>I can't speak for Dann, but it would be very nice of him to offer >>an updated source package, and more importantly, a corrected binary. >>(I myself cannot compile for windows). > >Everything: >ftp://cap.connx.com/pub/chess-solvers/chest/ > >The package in a zip: >ftp://cap.connx.com/pub/chess-solvers/chest/CHEST319.ZIP > >The binary only: >ftp://cap.connx.com/pub/chess-solvers/chest/chest319.exe Still calling it version 3.19?
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