Author: Bernhard Bauer
Date: 06:28:15 02/24/99
Hallo,
I came across a position from W. Chenkin,1960 in a book of J. Averbach.
Here is the position:
+---+---+---+---+---+---+---+---+
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+
7 | | | | | | | | |
+---+---+---+---+---+---+---+---+
6 | | | | | | | | |
+---+---+---+---+---+---+---+---+
5 | | | | | | | | |
+---+---+---+---+---+---+---+---+
4 | | | | | | | | |
+---+---+---+---+---+---+---+---+
3 | | | | | | | Q | |
+---+---+---+---+---+---+---+---+
2 | K | *P| | | | *R| | |
+---+---+---+---+---+---+---+---+
1 | | | | | | *K| | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
FEN: 8/8/8/8/8/6Q/Kp3r/5k
For white to move Crafty gives:
White(1): end-game phase
clearing hash tables
time surplus 0.00 time limit 10:00 (10:00)
depth time score variation (1)
1 0.13 1.80 1. Qe3
1-> 0.14 1.80 1. Qe3
2 0.14 1.78 1. Qe3 Re2
2 0.24 ++ 1. Qd3+!!
2 0.24 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
2-> 0.25 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
3 0.25 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
3-> 0.28 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
4 0.32 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
4-> 0.41 Mat51 1. Qd3+ Kg2 2. Qe4+ <EGTB>
time=0.86 cpu=32% mat=3 n=643 fh=85% nps=747
ext-> checks=101 recaps=0 pawns=0 1rep=4
predicted=0 nodes=643 evals=72
endgame tablebase-> probes done=135 successful=131 plimit=6
hashing-> trans/ref=33% pawn=99% used=0%
SMP-> split=0 stop=0 data=0/64 cpu=0.28 elap=0.86
mate in 51 moves.
This may be not enough to win due to the 50 moves rule.
When I do a search for the move that J. Awerbach gives in his book, Qg4!
Crafty gives some different output:
White(1): White(1): end-game phase
clearing hash tables
time surplus 0.00 time limit 10:00 (10:00)
depth time score variation (1)
1 0.11 1.70 1. Qg4
1-> 0.11 1.70 1. Qg4
2 0.11 1.68 1. Qg4 Rd2
2-> 0.11 1.68 1. Qg4 Rd2
3 0.21 ++ 1. Qg4!!
3 0.24 Mat41 1. Qg4 Rd2 2. Qf4+ <EGTB>
3-> 0.24 Mat41 1. Qg4 Rd2 2. Qf4+ <EGTB>
4 0.24 Mat41 1. Qg4 Rd2 2. Qf4+ <EGTB>
4-> 0.24 Mat41 1. Qg4 Rd2 2. Qf4+ <EGTB>
time=0.69 cpu=20% mat=3 n=275 fh=82% nps=398
ext-> checks=69 recaps=0 pawns=0 1rep=0
predicted=0 nodes=275 evals=69
endgame tablebase-> probes done=62 successful=62 plimit=7
hashing-> trans/ref=32% pawn=99% used=0%
SMP-> split=0 stop=0 data=0/64 cpu=0.14 elap=0.69
mate in 41 moves.
This would suffice for a win.
So may question is simply weather Crafty could be improved in that area.
Kind regards
Bernhard
This page took 0.01 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.