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Subject: Re: Extend on Check

Author: Volker Böhm

Date: 22:37:36 07/28/04

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Hi,

what do you "extend" in quiescese, only "check-evades" (king is in check - all
evades are done, not only captures) or checking moves (move that set king in
check) too?

What extends do you have you in total in normal search? (Make sure, that you
NEVER add extensions to add more than one depth at one position).

"Usual" Extend Algorithm for main search:

DoMove(Position, Move)
if (InCheck(Position)) Extend = 1; else Extend = 0;
// Usually limit extensions to the double of RootDepth (Depth value at root)
if (Ply + Depth + Extend > RootDepth * 2) Extend = 0;
PosVal = -Search(Position, -Beta, -Alpha, Depth - 1 + Extend, !Wtm);
UndoMove(Position, Move);

Do you use the same algorithm?

Greetings Volker

• Re: Extend on Check Stuart Cracraft 07:51:13 07/31/04
  • Re: Extend on Check Uri Blass 09:25:55 07/31/04
• Re: Extend on Check Uri Blass 23:08:09 07/28/04
  • Re: Extend on Check Volker Böhm 23:52:48 07/28/04

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