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Subject: Single-response extension

Author: Jeff GAZET

Date: 07:35:37 09/14/04

Good morning,

in the main search, before the moves loop, i have the basic "In Check" extension
(which add one ply).
If there is only one legal move and the king is in check, this is interesting to
extend one more ply. But i read that this is a bad idea to extend more than one
ply, so i limit to one ply max.
Then, "Single-response extension" is useless in this case :

search(depth,alpha,beta)
	{
	int extend=0;
	...
	if(InCheck=incheck(side)) extend+=ONEPLY;
	if(InCheck && side_has_only_one_legal_move) extend+=ONEPLY;

	// limit extensions
	if(extend>ONEPLY) extend=ONEPLY;

	for(each move) {...}
	...
	}

How is it possible to use both "Incheck" and "Single-response" extensions ?

Thanks.

• Re: Single-response extension Uri Blass 08:22:24 09/14/04
• Re: Single-response extension Robert Hyatt 08:18:58 09/14/04
  • Re: Single-response extension Jeff GAZET 09:20:47 09/14/04
    • Re: Single-response extension Robert Hyatt 14:07:50 09/14/04
    • Re: Single-response extension Rick Bischoff 09:57:06 09/14/04
• Re: Single-response extension Renze Steenhuisen 08:01:04 09/14/04
  • Re: Single-response extension Uri Blass 08:27:35 09/14/04

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