Author: Dann Corbit
Date: 11:18:50 05/07/02
Go up one level in this thread
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
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