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Merge commit 'f00d91f8ac72de8d201f8b50968bb66b1235dc9a' into cluster

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This commit is contained in:
Steinar H. Gunderson
2025-12-25 20:00:51 +01:00
parent 6653af1549 f00d91f8ac
commit 0eb376ce8d
1 changed files with 7 additions and 6 deletions
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src/search.cpp
+7 -6
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@@ -910,7 +910,7 @@ Value Search::Worker::search(
// If we have a good enough capture (or queen promotion) and a reduced search
// returns a value much above beta, we can (almost) safely prune the previous move.
probCutBeta = beta + 174 - 56 * improving;
if (depth > 3
if (depth >= 3
&& !is_decisive(beta)
// If value from transposition table is lower than probCutBeta, don't attempt
// probCut there and in further interactions with transposition table cutoff
@@ -921,6 +921,7 @@ Value Search::Worker::search(
assert(probCutBeta < VALUE_INFINITE && probCutBeta > beta);
MovePicker mp(pos, ttData.move, probCutBeta - ss->staticEval, &thisThread->captureHistory);
Depth probCutDepth = std::max(depth - 4, 0);
while ((move = mp.next_move()) != Move::none())
{
@@ -949,9 +950,9 @@ Value Search::Worker::search(
value = -qsearch<NonPV>(pos, ss + 1, -probCutBeta, -probCutBeta + 1);
// If the qsearch held, perform the regular search
if (value >= probCutBeta)
value =
-search<NonPV>(pos, ss + 1, -probCutBeta, -probCutBeta + 1, depth - 4, !cutNode);
if (value >= probCutBeta && probCutDepth > 0)
value = -search<NonPV>(pos, ss + 1, -probCutBeta, -probCutBeta + 1, probCutDepth,
!cutNode);
pos.undo_move(move);
@@ -959,8 +960,8 @@ Value Search::Worker::search(
{
// Save ProbCut data into transposition table
Distributed::save(tt, threads, thisThread, ttWriter, posKey,
value_to_tt(value, ss->ply), ss->ttPv, BOUND_LOWER, depth - 3,
move, unadjustedStaticEval, tt.generation());
value_to_tt(value, ss->ply), ss->ttPv, BOUND_LOWER,
probCutDepth + 1, move, unadjustedStaticEval, tt.generation());
if (!is_decisive(value))
return value - (probCutBeta - beta);