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Subject: Re: annoying en passant x-ray

Author: Sune Fischer

Date: 17:24:04 11/30/03

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On November 30, 2003 at 20:03:47, Georg v. Zimmermann wrote:

>
>>The only advantage that I can see, is that the move list might become 1-2 moves
>>shorter and therefore a bit faster to score and order, but for me the legality
>>checking of ~30 moves is more expensive.
>
>one more small advantage. If I am in check, I see immediatelly how many legal
>moves I have left, and can extend if it is only 1 or 2 or whatever my flavor of
>forcing check extension.

Yes that is one advantage to a dedicated in-check generator, but the frequency
of illegal moves in such a position is usually quite high so it's a good
investment in any case, IMO.

>While with your type of legal move generation, the first move I try might be
>indeed singular, but I dont know that yet since I falsely believe I have two
>legal moves.

I think the conventional keyword in this case is a one-reply extension, a
singular move usually means that one move is better than the others by some
margin.
Of course one-reply could fit into that category, YMMV :)

>This is of course far less relevant if I do singular extensions or something
>such which , of course, produces its own overhead
>
>Georg

-S.



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