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Take in account odd depths in razoring formula

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This is somewhat taken from Stockfish 1.2 Default,
only the razoring thresold are updated, not the
razoring depth.

At the end razoring is a bit more aggressive. Results
seems slightly positive.

After 999 games +239 =536 -224 Elo +5

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-01-05 12:41:27 +01:00
parent e828753a3a
commit dc4e2d8184
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1247,8 +1247,8 @@ namespace {
{ {
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 - RazorMargin - RazorMargin / 4) if ( (v < beta - RazorMargin - RazorMargin / 4)
|| (depth <= 2*OnePly && v < beta - RazorMargin) || (depth < 3*OnePly && v < beta - RazorMargin)
|| (depth <= OnePly && v < beta - RazorMargin / 2)) || (depth < 2*OnePly && v < beta - RazorMargin / 2))
return v; return v;
} }