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Subject: It is a nullmove killer (zugzwang)

Author: Rémi Coulom

Date: 06:28:30 11/05/99

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On November 05, 1999 at 08:46:59, Bernhard Bauer wrote:

>On November 05, 1999 at 06:31:49, Howard Exner wrote:
>>1. b5+ Qxb5 2. Nd3 Qxc4+ 3. Nf4 Qxe2 4. Nxe2
>>Input this into Crafty and where it goes.
>>White has to take care not to fall into a drawn ending with the
>>eventually advanced black rook pawn. Also the KQN vs kq should be avoided.
>>I tried what looked like good defenses for black but always came up a move
>>or two short
>>of drawing. If black just goes ahead and advances the a pawn white will
>>capture the g7 pawn with the king and win by one tempo. Those endgame tablebases
>>should come in handy.
>Thank you for your explanation. The line you give seams good.
>A human analysis is still better than anyone done by a computer.
>Anyway it would be interesting to know what other programs think.
>Kind regards

After 1. b5+ Qxb5 2. Nd3, black is in zugzwang. A program that does not do the
null move should find 1. b5+ at depth 5 or so.


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