Author: Uri Blass
Date: 13:20:24 09/03/00
Go up one level in this thread
On September 03, 2000 at 14:59:52, Enrique Irazoqui wrote:
>[D]5qrk/p1p1b1rp/4P2Q/1p6/5P2/8/P4P1P/B5RK w - b6 0 31
>
>Is there a program that can see a forced mate in this position? The main line is
>in the PGN score below, but 31... Bd6 offers more resistance. Most programs have
>trouble finding the first move, f3, let alone the mate line.
>
>Enrique
>
>[Event "corr"]
>[Site "?"]
>[Date "1879.??.??"]
>[Round "?"]
>[White "Chigorin, Mikhail"]
>[Black "Yakubovich"]
>[Result "1-0"]
>[SetUp "1"]
>[FEN "5qrk/p1p1b1rp/4P2Q/1p6/5P2/8/P4P1P/B5RK w - b6 0 31"]
>[PlyCount "11"]
>[EventDate "1879.??.??"]
>[Source "ChessBase"]
>
>31. f3 $1 c5 (31... Bd6 32. f5 Qe7 {(mate in 38, Fritz 6a)}) 32. f5 b4 33. Rg3
>c4 34. Qxh7+ $1 Kxh7 35. Rh3+ Bh4 36. Rxh4# 1-0
The mate in 38 is probably a bug in fritz.
I believe that tablebases are not relevant here and that Fritz does not search
more than 70 plies forward in all the lines so it cannot see mate in 38.
I also do not believe that hash tables can prove mate in 37(it is possible that
Fritz searches 40 plies forward and it remembers that the final position is mate
in 18 so the root position is mate in 38 but it seems more logical to me that
this long mate score is a bug).
I gave the position for chessmaster(ss=10).
I never saw chessmaster gives these strange mate scores.
Chessmaster shows main line that begins with 1.f3 Bd6 with 5.95 pawns for white
after 19 minutes and 14 seconds on pIII450(The score is going up every iteration
and maybe it can find the mate in the next iteration).
Uri
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