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Subject: Re: Mate in 7 moves - diagram

Author: Peter McKenzie

Date: 17:03:27 09/27/00

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On September 27, 2000 at 17:16:21, Andrew Williams wrote:

>On September 27, 2000 at 04:45:38, Eduard Nemeth wrote:
>
>>[D]8/8/p3R3/1p5p/1P5p/6rp/5K1p/7k w - - 0 1
>>
>>Shredder 4 and Fritz 6a this don't find !
>>
>>Eduard
>
>PostModernist finds this easily enough:
>
>9=  +M07     2    102865   1. Re1 Rg1 2. Rf1 a5 3. bxa5 b4 4. a6 b3 5. a7 Rxf1
>6. Kxf1 b2 7. a8=Q
>
>ie 2 seconds, 102865 nodes.

LambChop didn't find it, it looks like a nullmove problem to me.
After 1.Re1+ Rg1 2.Rf1 black just nullmoves, so the zugzwang is not detected.

I guess you don't nullmove in Rook endings?

>
>Andrew Williams



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