opelly/Stockfish
1
0
Fork 0
mirror of https://github.com/opelly27/Stockfish.git synced 2026-05-20 10:57:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'master' into sf-nnue-update

Browse Source
This commit is contained in:
joergoster
2020-07-11 12:03:17 +02:00
parent d6e8089f50 1f3bd968bb
commit db0615eed9
11 changed files with 177 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+40 -21
View File
@@ -263,10 +263,10 @@ void MainThread::search() {
Thread* bestThread = this;
if (int(Options["MultiPV"]) == 1 &&
!Limits.depth &&
!(Skill(Options["Skill Level"]).enabled() || int(Options["UCI_LimitStrength"])) &&
rootMoves[0].pv[0] != MOVE_NONE)
if ( int(Options["MultiPV"]) == 1
&& !Limits.depth
&& !(Skill(Options["Skill Level"]).enabled() || int(Options["UCI_LimitStrength"]))
&& rootMoves[0].pv[0] != MOVE_NONE)
bestThread = Threads.get_best_thread();
bestPreviousScore = bestThread->rootMoves[0].score;
@@ -596,7 +596,7 @@ namespace {
Key posKey;
Move ttMove, move, excludedMove, bestMove;
Depth extension, newDepth;
Value bestValue, value, ttValue, eval, maxValue;
Value bestValue, value, ttValue, eval, maxValue, probcutBeta;
bool ttHit, ttPv, formerPv, givesCheck, improving, didLMR, priorCapture;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning,
ttCapture, singularQuietLMR;
@@ -662,7 +662,7 @@ namespace {
// search to overwrite a previous full search TT value, so we use a different
// position key in case of an excluded move.
excludedMove = ss->excludedMove;
posKey = pos.key() ^ (Key(excludedMove) << 48); // Isn't a very good hash
posKey = excludedMove == MOVE_NONE ? pos.key() : pos.key() ^ make_key(excludedMove);
tte = TT.probe(posKey, ttHit);
ttValue = ttHit ? value_from_tt(tte->value(), ss->ply, pos.rule50_count()) : VALUE_NONE;
ttMove = rootNode ? thisThread->rootMoves[thisThread->pvIdx].pv[0]
@@ -670,7 +670,11 @@ namespace {
ttPv = PvNode || (ttHit && tte->is_pv());
formerPv = ttPv && !PvNode;
if (ttPv && depth > 12 && ss->ply - 1 < MAX_LPH && !priorCapture && is_ok((ss-1)->currentMove))
if ( ttPv
&& depth > 12
&& ss->ply - 1 < MAX_LPH
&& !priorCapture
&& is_ok((ss-1)->currentMove))
thisThread->lowPlyHistory[ss->ply - 1][from_to((ss-1)->currentMove)] << stat_bonus(depth - 5);
// thisThread->ttHitAverage can be used to approximate the running average of ttHit
@@ -867,23 +871,33 @@ namespace {
}
}
probcutBeta = beta + 176 - 49 * improving;
// Step 10. ProbCut (~10 Elo)
// 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 > 4
&& abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
&& abs(beta) < VALUE_TB_WIN_IN_MAX_PLY
&& !( ttHit
&& tte->depth() >= depth - 3
&& ttValue != VALUE_NONE
&& ttValue < probcutBeta))
{
Value raisedBeta = beta + 176 - 49 * improving;
assert(raisedBeta < VALUE_INFINITE);
MovePicker mp(pos, ttMove, raisedBeta - ss->staticEval, &captureHistory);
if ( ttHit
&& tte->depth() >= depth - 3
&& ttValue != VALUE_NONE
&& ttValue >= probcutBeta
&& ttMove
&& pos.capture_or_promotion(ttMove))
return probcutBeta;
assert(probcutBeta < VALUE_INFINITE);
MovePicker mp(pos, ttMove, probcutBeta - ss->staticEval, &captureHistory);
int probCutCount = 0;
while ( (move = mp.next_move()) != MOVE_NONE
&& probCutCount < 2 + 2 * cutNode
&& !( move == ttMove
&& tte->depth() >= depth - 4
&& ttValue < raisedBeta))
&& probCutCount < 2 + 2 * cutNode)
if (move != excludedMove && pos.legal(move))
{
assert(pos.capture_or_promotion(move));
@@ -901,16 +915,21 @@ namespace {
pos.do_move(move, st);
// Perform a preliminary qsearch to verify that the move holds
value = -qsearch<NonPV>(pos, ss+1, -raisedBeta, -raisedBeta+1);
value = -qsearch<NonPV>(pos, ss+1, -probcutBeta, -probcutBeta+1);
// If the qsearch held, perform the regular search
if (value >= raisedBeta)
value = -search<NonPV>(pos, ss+1, -raisedBeta, -raisedBeta+1, depth - 4, !cutNode);
if (value >= probcutBeta)
value = -search<NonPV>(pos, ss+1, -probcutBeta, -probcutBeta+1, depth - 4, !cutNode);
pos.undo_move(move);
if (value >= raisedBeta)
if (value >= probcutBeta)
{
tte->save(posKey, value_to_tt(value, ss->ply), ttPv,
BOUND_LOWER,
depth - 3, move, ss->staticEval);
return value;
}
}
}
@@ -1486,8 +1505,8 @@ moves_loop: // When in check, search starts from here
// Initialize a MovePicker object for the current position, and prepare
// to search the moves. Because the depth is <= 0 here, only captures,
// queen promotions and checks (only if depth >= DEPTH_QS_CHECKS) will
// be generated.
// queen and checking knight promotions, and other checks(only if depth >= DEPTH_QS_CHECKS)
// will be generated.
MovePicker mp(pos, ttMove, depth, &thisThread->mainHistory,
&thisThread->captureHistory,
contHist,