Author: Jason Williamson
Date: 23:18:21 04/21/00
Go up one level in this thread
This is the "drawing" line of the Zaitsev opening. Basicly, the reason the
repetition occurs is black has no better move then Re8 (in theory) after Nf3.
As to the fact its a repetion, the position after 10.d4 Re8 is repeated a 3rd
time after Nf3. The rules of chess the its the repetition of POSITION not
moves. That might be the source of your confusion.
Jason
On April 21, 2000 at 16:32:21, pete wrote:
>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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