Author: Dann Corbit
Date: 22:31:36 05/07/02
Go up one level in this thread
On May 07, 2002 at 15:09:57, Ernst Walet wrote: >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 > > >Dan, when accessing the first link, I immediately get attacked by a trojan >horse. This is the message drom my fire wall: > >Soket de Trois v1. Trojan horse at cap.connx.com (209.20.248.158) > >Maybe you should check your server? I shut down my ftp site, and I am running the virus scanner over all drives. Pretty strange that it did not get diagnosed. I have McAfee Virus Scan 4.5.1, and it gets updated over the net every night.
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