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Tweak probcut threshold

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Use better threshold for capture move generation.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 23265 W: 4415 L: 4188 D: 14662

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 36618 W: 5083 L: 4836 D: 26699

bench: 7030088
This commit is contained in:
Stefan Geschwentner
2016-08-28 12:39:49 +02:00
committed by Marco Costalba
parent b4f6728e61
commit 6aa9308f08
1 changed files with 3 additions and 4 deletions
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7
src/search.cpp
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@@ -788,9 +788,8 @@ namespace {
}
// Step 9. ProbCut (skipped when in check)
// If we have a very good capture (i.e. SEE > seeValues[captured_piece_type])
// and a reduced search returns a value much above beta, we can (almost)
// safely prune the previous move.
// If we have a good enough capture and a reduced search returns a value
// much above beta, we can (almost) safely prune the previous move.
if ( !PvNode
&& depth >= 5 * ONE_PLY
&& abs(beta) < VALUE_MATE_IN_MAX_PLY)
@@ -802,7 +801,7 @@ namespace {
assert((ss-1)->currentMove != MOVE_NONE);
assert((ss-1)->currentMove != MOVE_NULL);
MovePicker mp(pos, ttMove, PieceValue[MG][pos.captured_piece_type()]);
MovePicker mp(pos, ttMove, rbeta - ss->staticEval);
while ((move = mp.next_move()) != MOVE_NONE)
if (pos.legal(move))