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In razor qsearch use corrected beta

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Correct beta by razor margin when callin qsearch

After 1019 games on Joona's QUAD

Mod - Orig: 524 - 495 (+10 elo)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-18 09:30:02 +01:00
parent 87507121d5
commit 989833205f
1 changed files with 3 additions and 2 deletions
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src/search.cpp
+3 -2
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@@ -1360,8 +1360,9 @@ namespace {
&& ttMove == MOVE_NONE && ttMove == MOVE_NONE
&& !pos.has_pawn_on_7th(pos.side_to_move())) && !pos.has_pawn_on_7th(pos.side_to_move()))
{ {
Value v = qsearch(pos, ss, beta-1, beta, Depth(0), ply, threadID); Value rbeta = beta - RazorMargins[int(depth) - 2];
if (v < beta - RazorMargins[int(depth) - 2]) Value v = qsearch(pos, ss, rbeta-1, rbeta, Depth(0), ply, threadID);
if (v < rbeta)
return v; return v;
} }