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Subject: Re: Ruffian 1.0.0 can't mate with KR v K??

Author: José de Jesús García Ruvalcaba

Date: 11:28:16 09/27/02

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On September 26, 2002 at 09:44:11, Severi Salminen wrote:

>>Ruffiah seams to be a modern engine. It uses the null-move heuristic heavily.
>>Since the endgame is all about zugzwang it is no surprise that Ruffian will fail
>>to to properly in that area. Tablebases resolve this partially.
>>So why don't you use them??
>>Showing bad results when you criple the engine dosn't say anything about the
>>engine, it says something about the user.
>
>Nullmoves have nothing to do with winning KR-K endings - no zugzwangs involved
>at all.

KR vs K is only about Zugzwang. Two critical positions:
[D]3k4/8/4K3/2R5/8/8/8/8 b
[D]1k6/7R/2K5/8/8/8/8 b

>The knowledge needed to win many types of basic endings is very easy to
>code and works in _many_ positions: drive the opposing king to a corner.
>
>Severi



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