Author: Normand M. Blais
Date: 10:08:10 09/19/03
Go up one level in this thread
On September 19, 2003 at 12:35:58, Matthew White wrote:
>Hi all,
>[D]8/8/p7/P6p/1B3pk1/1P6/2b2K2/8 b - - 0 1
> Here is an interesting endgame test position for your engine. The key move is
>...h4! White has just made the move Bxb4, and the natural recapture Bxb3 leads
>to a long draw due to the wrong bishop. h4, however, leads to a win for black.
>The actual game (Weinstein - Seirawan, Quebec, 1977) proceeded:
>
>1... h4 2. Bd2 h3 3. Kg1 Kg3 4. Be1+ Kf3 5. Bd2 Bf5 6. b4 Bc8 7. Kh2 Ke4 8. Bc1
>Bd7 9. Kg1 f3 10. Bg5 Kd3 11. Bf4 Ke2 12. Bg3 f2+ 13. Bxf2 h2+ 14. Kg2 h1=Q+ {
>and white resigns in light of:} 15. Kxh1 Kxf2 16. Kh2 Bc8 17. Kh1 Bb7+ 18. Kh2
>Bg2 19. b5 axb5 20. a6 b4 21. a7 b3 22. a8=Q Bxa8 *
>
>Many engines start off with h4, but change to Bxb3... How does your favorite do?
>
>Matt
ALEX 1.41.46
Winboard Chess engine
Normand M. Blais July 2002 - September 2003
Reading configuration file: "c:\chess\alex009\Alex.ini"
Loading opening database
23673 records
book_size = 23673
Main hash table: 32 meg
Pawn hash table: 5 meg
White[1]:sb 8/8/p7/P6p/1B3pk1/1P6/2b2K2/8 b - - 0 1
8 . . . . . . . .
7 . . . . . . . .
6 p . . . . . . .
5 P . . . . . . p
4 . B . . . p k .
3 . P . . . . . .
2 . . b . . K . .
1 . . . . . . . .
a b c d e f g h
Black[1]:sd 14
Black[1]:go
1 ++ 0 1 c2b3!
1 3.69 0 15 c2b3
2 3.59 0 68 c2b3 f2e2
3 3.85 0 540 c2b3 f2e2 h5h4
4 3.80 0 1709 c2b3 b4c3 h5h4 f2e2
5 4.06 0 9951 h5h4 f2e2 h4h3 b4c3 c2b3
6 4.01 0 20423 h5h4 b4c3 c2b3 c3d4 h4h3 f2e2
7 4.24 2 62728 h5h4 b4c3 c2b3 f2e2 h4h3 e2d3 f4f3
8 4.39 3 114433 h5h4 f2g1 c2b3 b4c3 h4h3 c3d4 f4f3 g1f2
9 4.37 10 350355 h5h4 b4c5 c2b3 f2e2 h4h3 c5g1 b3d5 g1d4 h3h2
10 4.44 23 762508 h5h4 b4c5 c2b3 f2e1 h4h3 c5g1 b3c4 g1h2 f4f3 h2e5
11 4.62 57 1951012 h5h4 b4c5 c2b3 f2e2 h4h3 c5g1 g4g3 e2d3 h3h2 g1h2
g3h2 d3e4
12 4.62 112 3807030 h5h4 b4c5 c2b3 f2e2 h4h3 c5g1 g4g3 e2d3 h3h2
13 4.69 231 8031311 h5h4 b4c5 c2b3 f2g2 h4h3 g2h2 f4f3 c5d4 b3e6 d4e3
g4f5 h2g1 f5e4 g1f2
14 4.69 430 14597746 h5h4 f2g1 h4h3 g1f2 g4f5 f2g1 c2b3 g1h2 f5g4
1. ... h5h4
NMB
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