Author: Enrique Irazoqui
Date: 13:44:12 09/03/00
Go up one level in this thread
On September 03, 2000 at 16:20:24, Uri Blass wrote:
>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
I'm trying with F6b, Goliath light and CM6k. The best line I got so far is a
mate in 12: 31. f3 Bd6 32. f5 c5 33. Rg4 Bf4 34. Qxf4 Qd8 35. Rg1 c4 36. Bd4 Qb6
37.
Rxg7 Rxg7 38. Bxg7+ Kg8 39. Bh6 Qd8 40. Qg3+ Qg5 41. Qxg5+ Kh8 42. Qd8# 1-0
But I am forcing the moves, so I can't be sure that there is not a better line.
Enrique
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