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Search parameters tune at 180+1.8

Browse source 
Passed VLTC: https://tests.stockfishchess.org/tests/view/65200c58ac577114367280bc
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 146180 W: 37407 L: 36988 D: 71785
Ptnml(0-2): 21, 14474, 43675, 14905, 15

Passed VLTC SMP: https://tests.stockfishchess.org/tests/view/652403da3125598fc7eb4b6d
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 57580 W: 15061 L: 14739 D: 27780
Ptnml(0-2): 2, 5001, 18460, 5327, 0

closes https://github.com/official-stockfish/Stockfish/pull/4826

Bench: 1099336
This commit is contained in:
Muzhen Gaming 2023-10-10 17:43:36 +02:00 • committed by Disservin
parent 7a4de96159
commit 002636362e
1 changed files with 39 additions and 39 deletions
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78
src/search.cpp
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@ -73,7 +73,7 @@ namespace {
// Futility margin
Value futility_margin(Depth d, bool noTtCutNode, bool improving) {
return Value((140 - 40 * noTtCutNode) * (d - improving));
return Value((126 - 42 * noTtCutNode) * (d - improving));
}
// Reductions lookup table initialized at startup
@ -81,8 +81,8 @@ namespace {
Depth reduction(bool i, Depth d, int mn, Value delta, Value rootDelta) {
int reductionScale = Reductions[d] * Reductions[mn];
return (reductionScale + 1372 - int(delta) * 1073 / int(rootDelta)) / 1024
+ (!i && reductionScale > 936);
return (reductionScale + 1560 - int(delta) * 945 / int(rootDelta)) / 1024
+ (!i && reductionScale > 791);
}
constexpr int futility_move_count(bool improving, Depth depth) {
@ -92,7 +92,7 @@ namespace {
// History and stats update bonus, based on depth
int stat_bonus(Depth d) {
return std::min(336 * d - 547, 1561);
return std::min(334 * d - 531, 1538);
}
// Add a small random component to draw evaluations to avoid 3-fold blindness
@ -174,7 +174,7 @@ namespace {
void Search::init() {
for (int i = 1; i < MAX_MOVES; ++i)
Reductions[i] = int((20.57 + std::log(Threads.size()) / 2) * std::log(i));
Reductions[i] = int((20.37 + std::log(Threads.size()) / 2) * std::log(i));
}
@ -359,12 +359,12 @@ void Thread::search() {
// Reset aspiration window starting size
Value prev = rootMoves[pvIdx].averageScore;
delta = Value(10) + int(prev) * prev / 15799;
delta = Value(10) + int(prev) * prev / 17470;
alpha = std::max(prev - delta,-VALUE_INFINITE);
beta = std::min(prev + delta, VALUE_INFINITE);
// Adjust optimism based on root move's previousScore (~4 Elo)
int opt = 109 * prev / (std::abs(prev) + 141);
int opt = 113 * prev / (std::abs(prev) + 109);
optimism[ us] = Value(opt);
optimism[~us] = -optimism[us];
@ -750,7 +750,7 @@ namespace {
// Use static evaluation difference to improve quiet move ordering (~4 Elo)
if (is_ok((ss-1)->currentMove) && !(ss-1)->inCheck && !priorCapture)
{
int bonus = std::clamp(-18 * int((ss-1)->staticEval + ss->staticEval), -1817, 1817);
int bonus = std::clamp(-18 * int((ss-1)->staticEval + ss->staticEval), -1812, 1812);
thisThread->mainHistory[~us][from_to((ss-1)->currentMove)] << bonus;
}
@ -767,7 +767,7 @@ namespace {
// If eval is really low check with qsearch if it can exceed alpha, if it can't,
// return a fail low.
// Adjust razor margin according to cutoffCnt. (~1 Elo)
if (eval < alpha - 456 - (252 - 200 * ((ss+1)->cutoffCnt > 3)) * depth * depth)
if (eval < alpha - 492 - (257 - 200 * ((ss+1)->cutoffCnt > 3)) * depth * depth)
{
value = qsearch<NonPV>(pos, ss, alpha - 1, alpha);
if (value < alpha)
@ -778,9 +778,9 @@ namespace {
// The depth condition is important for mate finding.
if ( !ss->ttPv
&& depth < 9
&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving) - (ss-1)->statScore / 306 >= beta
&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving) - (ss-1)->statScore / 321 >= beta
&& eval >= beta
&& eval < 24923 // smaller than TB wins
&& eval < 29462 // smaller than TB wins
&& !( !ttCapture
&& ttMove
&& thisThread->mainHistory[us][from_to(ttMove)] < 989))
@ -789,10 +789,10 @@ namespace {
// Step 9. Null move search with verification search (~35 Elo)
if ( !PvNode
&& (ss-1)->currentMove != MOVE_NULL
&& (ss-1)->statScore < 17329
&& (ss-1)->statScore < 17257
&& eval >= beta
&& eval >= ss->staticEval
&& ss->staticEval >= beta - 21 * depth + 258
&& ss->staticEval >= beta - 24 * depth + 281
&& !excludedMove
&& pos.non_pawn_material(us)
&& ss->ply >= thisThread->nmpMinPly
@ -801,7 +801,7 @@ namespace {
assert(eval - beta >= 0);
// Null move dynamic reduction based on depth and eval
Depth R = std::min(int(eval - beta) / 173, 6) + depth / 3 + 4;
Depth R = std::min(int(eval - beta) / 152, 6) + depth / 3 + 4;
ss->currentMove = MOVE_NULL;
ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];
@ -850,7 +850,7 @@ namespace {
&& !ttMove)
depth -= 2;
probCutBeta = beta + 168 - 61 * improving;
probCutBeta = beta + 168 - 70 * improving;
// Step 11. ProbCut (~10 Elo)
// If we have a good enough capture (or queen promotion) and a reduced search returns a value
@ -906,7 +906,7 @@ namespace {
moves_loop: // When in check, search starts here
// Step 12. A small Probcut idea, when we are in check (~4 Elo)
probCutBeta = beta + 413;
probCutBeta = beta + 416;
if ( ss->inCheck
&& !PvNode
&& ttCapture
@ -1000,12 +1000,12 @@ moves_loop: // When in check, search starts here
if ( !givesCheck
&& lmrDepth < 7
&& !ss->inCheck
&& ss->staticEval + 197 + 248 * lmrDepth + PieceValue[pos.piece_on(to_sq(move))]
&& ss->staticEval + 188 + 206 * lmrDepth + PieceValue[pos.piece_on(to_sq(move))]
+ captureHistory[movedPiece][to_sq(move)][type_of(pos.piece_on(to_sq(move)))] / 7 < alpha)
continue;
// SEE based pruning for captures and checks (~11 Elo)
if (!pos.see_ge(move, Value(-205) * depth))
if (!pos.see_ge(move, Value(-185) * depth))
continue;
}
else
@ -1016,24 +1016,24 @@ moves_loop: // When in check, search starts here
// Continuation history based pruning (~2 Elo)
if ( lmrDepth < 6
&& history < -3832 * depth)
&& history < -3232 * depth)
continue;
history += 2 * thisThread->mainHistory[us][from_to(move)];
lmrDepth += history / 7011;
lmrDepth += history / 5793;
lmrDepth = std::max(lmrDepth, -2);
// Futility pruning: parent node (~13 Elo)
if ( !ss->inCheck
&& lmrDepth < 12
&& ss->staticEval + 112 + 138 * lmrDepth <= alpha)
&& lmrDepth < 13
&& ss->staticEval + 115 + 122 * lmrDepth <= alpha)
continue;
lmrDepth = std::max(lmrDepth, 0);
// Prune moves with negative SEE (~4 Elo)
if (!pos.see_ge(move, Value(-31 * lmrDepth * lmrDepth)))
if (!pos.see_ge(move, Value(-27 * lmrDepth * lmrDepth)))
continue;
}
}
@ -1051,7 +1051,7 @@ moves_loop: // When in check, search starts here
// scaling. Their values are optimized to time controls of 180+1.8 and longer
// so changing them requires tests at this type of time controls.
if ( !rootNode
&& depth >= 4 - (thisThread->completedDepth > 22) + 2 * (PvNode && tte->is_pv())
&& depth >= 4 - (thisThread->completedDepth > 24) + 2 * (PvNode && tte->is_pv())
&& move == ttMove
&& !excludedMove // Avoid recursive singular search
/* && ttValue != VALUE_NONE Already implicit in the next condition */
@ -1059,7 +1059,7 @@ moves_loop: // When in check, search starts here
&& (tte->bound() & BOUND_LOWER)
&& tte->depth() >= depth - 3)
{
Value singularBeta = ttValue - (82 + 65 * (ss->ttPv && !PvNode)) * depth / 64;
Value singularBeta = ttValue - (64 + 57 * (ss->ttPv && !PvNode)) * depth / 64;
Depth singularDepth = (depth - 1) / 2;
ss->excludedMove = move;
@ -1073,11 +1073,11 @@ moves_loop: // When in check, search starts here
// Avoid search explosion by limiting the number of double extensions
if ( !PvNode
&& value < singularBeta - 21
&& value < singularBeta - 18
&& ss->doubleExtensions <= 11)
{
extension = 2;
depth += depth < 13;
depth += depth < 15;
}
}
@ -1095,7 +1095,7 @@ moves_loop: // When in check, search starts here
// If we are on a cutNode, reduce it based on depth (negative extension) (~1 Elo)
else if (cutNode)
extension = depth < 17 ? -3 : -1;
extension = depth < 19 ? -2 : -1;
// If the eval of ttMove is less than value, we reduce it (negative extension) (~1 Elo)
else if (ttValue <= value)
@ -1111,7 +1111,7 @@ moves_loop: // When in check, search starts here
else if ( PvNode
&& move == ttMove
&& move == ss->killers[0]
&& (*contHist[0])[movedPiece][to_sq(move)] >= 5168)
&& (*contHist[0])[movedPiece][to_sq(move)] >= 4194)
extension = 1;
}
@ -1139,7 +1139,7 @@ moves_loop: // When in check, search starts here
r -= cutNode && tte->depth() >= depth ? 3 : 2;
// Decrease reduction if opponent's move count is high (~1 Elo)
if ((ss-1)->moveCount > 8)
if ((ss-1)->moveCount > 7)
r--;
// Increase reduction for cut nodes (~3 Elo)
@ -1175,10 +1175,10 @@ moves_loop: // When in check, search starts here
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)]
- 4006;
- 3848;
// Decrease/increase reduction for moves with a good/bad history (~25 Elo)
r -= ss->statScore / (11124 + 4740 * (depth > 5 && depth < 22));
r -= ss->statScore / (10216 + 3855 * (depth > 5 && depth < 23));
// Step 17. Late moves reduction / extension (LMR, ~117 Elo)
// We use various heuristics for the sons of a node after the first son has
@ -1202,8 +1202,8 @@ moves_loop: // When in check, search starts here
{
// Adjust full-depth search based on LMR results - if the result
// was good enough search deeper, if it was bad enough search shallower
const bool doDeeperSearch = value > (bestValue + 64 + 11 * (newDepth - d));
const bool doEvenDeeperSearch = value > alpha + 711 && ss->doubleExtensions <= 6;
const bool doDeeperSearch = value > (bestValue + 51 + 10 * (newDepth - d));
const bool doEvenDeeperSearch = value > alpha + 700 && ss->doubleExtensions <= 6;
const bool doShallowerSearch = value < bestValue + newDepth;
ss->doubleExtensions = ss->doubleExtensions + doEvenDeeperSearch;
@ -1321,8 +1321,8 @@ moves_loop: // When in check, search starts here
// Reduce other moves if we have found at least one score improvement (~2 Elo)
if ( depth > 2
&& depth < 12
&& beta < 14362
&& value > -12393)
&& beta < 13828
&& value > -11369)
depth -= 2;
assert(depth > 0);
@ -1371,7 +1371,7 @@ moves_loop: // When in check, search starts here
// Bonus for prior countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE)
{
int bonus = (depth > 5) + (PvNode || cutNode) + (bestValue < alpha - 800) + ((ss-1)->moveCount > 12);
int bonus = (depth > 6) + (PvNode || cutNode) + (bestValue < alpha - 653) + ((ss-1)->moveCount > 11);
update_continuation_histories(ss-1, pos.piece_on(prevSq), prevSq, stat_bonus(depth) * bonus);
thisThread->mainHistory[~us][from_to((ss-1)->currentMove)] << stat_bonus(depth) * bonus / 2;
}
@ -1593,7 +1593,7 @@ moves_loop: // When in check, search starts here
continue;
// Do not search moves with bad enough SEE values (~5 Elo)
if (!pos.see_ge(move, Value(-95)))
if (!pos.see_ge(move, Value(-90)))
continue;
}
@ -1726,7 +1726,7 @@ moves_loop: // When in check, search starts here
if (!pos.capture_stage(bestMove))
{
int bestMoveBonus = bestValue > beta + 145 ? quietMoveBonus // larger bonus
int bestMoveBonus = bestValue > beta + 168 ? quietMoveBonus // larger bonus
: stat_bonus(depth); // smaller bonus
// Increase stats for the best move in case it was a quiet move