Author: Christophe Theron
Date: 05:21:19 08/10/98
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On August 10, 1998 at 04:59:04, Robert Hyatt wrote:
>Basically null-move fails whenever there is a zugzwang. Which means that
>not moving is the best move. There are few such positions when there are
>pieces on the board, but they do exist. And in such positions, each time
>such a situation arises, the null-move fails high, not because the position
>is good for the side on move, but because the position is so bad that doing
>nothing is actually the best move...
>
>and no amount of searching will get around that, unless the null-move
>algorithm is modified in some way... It is possible, however, to reduce
>the frequency of occurrences, but it means turning null-move off at selected
>nodes...
Here is a position where (I think) white is in zugzwang after Qd1!
Both sides have queen and bishop and many pawns, so it's quite unusual to be in
zugzwang here:
8/2b2pk1/6p1/p2p3p/P2P1P1P/2P3P1/2qB2QK/8 b - - ; Qd1!
The position is not quite clear, and it could be that Qxa4 is the best move
(Tiger finds it after 20 seconds, but I don't know if it is correct). Qd1 seems
to lead to a draw.
I would like to have the opinion of experts on Qd1. Is there really a zugzwang
here? Here there programs that fail to find Qd1 or Qxa4?
If you have a zugzwang position with a lot of material on the board, please post
them here. Thanks!
Christophe
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