kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 00:33:09 +00:00
Code Issues Releases Wiki Activity

Less aggressive razoring

Browse source 
Use a margin to compare with beta so that positions
that after the verifying qsearch have gained a lot of points
are not discarded just becasue not above beta.

Also remove the second condition on depth <= OnePly, it
was too risky and added only a 2% more of pruned nodes.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-21 10:42:39 +01:00
parent b58ad355ca
commit 96d0501735
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/search.cpp
View file

@ -1237,11 +1237,11 @@ namespace {
} }
// Null move search not allowed, try razoring // Null move search not allowed, try razoring
else if ( !value_is_mate(beta) else if ( !value_is_mate(beta)
&& ( (approximateEval < beta - RazorMargin && depth < RazorDepth) && approximateEval < beta - RazorMargin
||(approximateEval < beta - PawnValueMidgame && depth <= OnePly))) && depth < RazorDepth)
{ {
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID); Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID);
if (v < beta) if (v < beta - RazorMargin / 2)
return v; return v;
} }