Author: Daniel Shawul
Date: 02:28:28 06/09/04
Hi
I read about the botvinnik-markoff extension in ccc archieve
I have two questions concerning the method
here is how i understood it
do_null
search(-beta+1,-beta,d-R-1)
undo_null
if(score > beta)
return score
else
{
if(score==-MATESCORE+ply+1)
matethreat extension
else if ( score < MARGIN)
{
threatmove = bestmove of ply+1
if(to(threatmove) == to(threatmove of ply-2)
bm extension
}
}
qn1. What is the value of margin. -2,-5 pawns?
Or should it be something like score < alpha - 2pawns
or score < material balance - 2pawns
qn2. Should i trigger the extension also when the piece being threatened
at ply-2 moves and the to square is now threatened?
best
daniel
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