Author: pete
Date: 13:32:21 04/21/00
Game : Crafty17.10 (winboard)- Junior6 on 2 computers ( rest really irrelevant
); crafty played with the "official" book.bin .
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3
Bb7 10.d4 Re8 11.Ng5 Rf8 12.Nf3 Re8 13.Ng5 Rf8 14.Nf3
Here crafty claimed draw by repetition !?
Part of crafty-logfile :
Black(13): time 462484
time remaining: 77:04 (crafty).
Black(13): otim 447395
time remaining: 74:33 (opponent).
Black(13): e8f8
predicted move made.
time=5:41 cpu=99% mat=0 n=67749325 fh=90% nps=198567
ext-> checks=777869 recaps=260250 pawns=28570 1rep=59721 thrt:1500
predicted=14 nodes=67749325 evals=22514617
endgame tablebase-> probes done=0 successful=0
time used: 1:38
White(14): Nf3
time used: 4:03
game is a draw by repetition.
1/2-1/2 {Drawn by 3-fold repetition}
+---+---+---+---+---+---+---+---+
8 | *R| | | *Q| | *R| *K| |
+---+---+---+---+---+---+---+---+
7 | | *B| *P| | *B| *P| *P| *P|
+---+---+---+---+---+---+---+---+
6 | *P| | *N| *P| | *N| | |
+---+---+---+---+---+---+---+---+
5 | | *P| | | *P| | | |
+---+---+---+---+---+---+---+---+
4 | | | | P | P | | | |
+---+---+---+---+---+---+---+---+
3 | | B | P | | | N | | P |
+---+---+---+---+---+---+---+---+
2 | P | P | | | | P | P | |
+---+---+---+---+---+---+---+---+
1 | R | N | B | Q | R | | K | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
puzzling over a move to ponder.
clearing hash tables
nss depth time score variation (1)
6-> 0.83 0.00 14. ... Re8
7 0.83 0.00 14. ... Re8
Black(14): Re8 [pondering]
clearing hash tables
time limit 2:42 (16:15)
nss depth time score variation (1)
Black(14): result 1/2-1/2 {Drawn by 3-fold repetition}
Black(14): force
Black(14): quit
LearnBook() executed
execution complete.
This seems to be a bug to me . As far as I understand the rule the 1st one who
could claim draw here is black when he plans Re8 which is btw not forced at all
.
Minor issue is that I have seen this special opening line in a few computer
programs opening books now and I remember a few that won't avoid the draw by
simply choosing something else .
happy easter.
pete
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