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VVLTC search tune
Parameters were tuned in 2 stages: 1. 127k games at VVLTC: https://tests.stockfishchess.org/tests/view/6649f8dfb8fa20e74c39f52a. 2. 106k games at VVLTC: https://tests.stockfishchess.org/tests/view/664bfb77830eb9f886615a9d. Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/664e8dd9928b1fb18de4e410 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 20466 W: 5340 L: 5093 D: 10033 Ptnml(0-2): 0, 1796, 6397, 2037, 3 Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/664eb4aa928b1fb18de4e47d LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 15854 W: 4186 L: 3934 D: 7734 Ptnml(0-2): 1, 1367, 4938, 1621, 0 closes https://github.com/official-stockfish/Stockfish/pull/5286 Bench: 1558110
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1 changed files with 44 additions and 44 deletions
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@ -60,9 +60,9 @@ static constexpr double EvalLevel[10] = {0.981, 0.956, 0.895, 0.949, 0.913,
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// Futility margin
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// Futility margin
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Value futility_margin(Depth d, bool noTtCutNode, bool improving, bool oppWorsening) {
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Value futility_margin(Depth d, bool noTtCutNode, bool improving, bool oppWorsening) {
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Value futilityMult = 127 - 48 * noTtCutNode;
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Value futilityMult = 129 - 43 * noTtCutNode;
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Value improvingDeduction = 65 * improving * futilityMult / 32;
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Value improvingDeduction = 56 * improving * futilityMult / 32;
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Value worseningDeduction = 334 * oppWorsening * futilityMult / 1024;
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Value worseningDeduction = 336 * oppWorsening * futilityMult / 1024;
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return futilityMult * d - improvingDeduction - worseningDeduction;
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return futilityMult * d - improvingDeduction - worseningDeduction;
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}
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}
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@ -74,15 +74,15 @@ constexpr int futility_move_count(bool improving, Depth depth) {
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// Add correctionHistory value to raw staticEval and guarantee evaluation does not hit the tablebase range
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// Add correctionHistory value to raw staticEval and guarantee evaluation does not hit the tablebase range
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Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos) {
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Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos) {
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auto cv = w.correctionHistory[pos.side_to_move()][pawn_structure_index<Correction>(pos)];
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auto cv = w.correctionHistory[pos.side_to_move()][pawn_structure_index<Correction>(pos)];
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v += cv * std::abs(cv) / 6047;
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v += cv * std::abs(cv) / 5435;
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return std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
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return std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
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}
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}
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// History and stats update bonus, based on depth
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// History and stats update bonus, based on depth
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int stat_bonus(Depth d) { return std::clamp(187 * d - 288, 17, 1548); }
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int stat_bonus(Depth d) { return std::clamp(205 * d - 283, 18, 1544); }
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// History and stats update malus, based on depth
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// History and stats update malus, based on depth
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int stat_malus(Depth d) { return (d < 4 ? 630 * d - 281 : 1741); }
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int stat_malus(Depth d) { return (d < 4 ? 767 * d - 275 : 1911); }
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// Add a small random component to draw evaluations to avoid 3-fold blindness
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// Add a small random component to draw evaluations to avoid 3-fold blindness
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Value value_draw(size_t nodes) { return VALUE_DRAW - 1 + Value(nodes & 0x2); }
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Value value_draw(size_t nodes) { return VALUE_DRAW - 1 + Value(nodes & 0x2); }
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@ -312,12 +312,12 @@ void Search::Worker::iterative_deepening() {
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// Reset aspiration window starting size
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// Reset aspiration window starting size
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Value avg = rootMoves[pvIdx].averageScore;
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Value avg = rootMoves[pvIdx].averageScore;
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delta = 10 + avg * avg / 9828;
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delta = 9 + avg * avg / 10502;
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alpha = std::max(avg - delta, -VALUE_INFINITE);
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alpha = std::max(avg - delta, -VALUE_INFINITE);
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beta = std::min(avg + delta, VALUE_INFINITE);
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beta = std::min(avg + delta, VALUE_INFINITE);
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// Adjust optimism based on root move's averageScore (~4 Elo)
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// Adjust optimism based on root move's averageScore (~4 Elo)
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optimism[us] = 116 * avg / (std::abs(avg) + 84);
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optimism[us] = 122 * avg / (std::abs(avg) + 92);
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optimism[~us] = -optimism[us];
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optimism[~us] = -optimism[us];
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// Start with a small aspiration window and, in the case of a fail
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// Start with a small aspiration window and, in the case of a fail
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@ -507,7 +507,7 @@ void Search::Worker::clear() {
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h->fill(-60);
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h->fill(-60);
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for (size_t i = 1; i < reductions.size(); ++i)
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for (size_t i = 1; i < reductions.size(); ++i)
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reductions[i] = int((21.69 + std::log(size_t(options["Threads"])) / 2) * std::log(i));
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reductions[i] = int((19.90 + std::log(size_t(options["Threads"])) / 2) * std::log(i));
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refreshTable.clear(networks);
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refreshTable.clear(networks);
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}
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}
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@ -740,7 +740,7 @@ Value Search::Worker::search(
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// Use static evaluation difference to improve quiet move ordering (~9 Elo)
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// Use static evaluation difference to improve quiet move ordering (~9 Elo)
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if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture)
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if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture)
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{
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{
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int bonus = std::clamp(-11 * int((ss - 1)->staticEval + ss->staticEval), -1729, 1517);
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int bonus = std::clamp(-11 * int((ss - 1)->staticEval + ss->staticEval), -1592, 1390);
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bonus = bonus > 0 ? 2 * bonus : bonus / 2;
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bonus = bonus > 0 ? 2 * bonus : bonus / 2;
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thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus;
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thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus;
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if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
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if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
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@ -762,7 +762,7 @@ Value Search::Worker::search(
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// Step 7. Razoring (~1 Elo)
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// Step 7. Razoring (~1 Elo)
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// If eval is really low check with qsearch if it can exceed alpha, if it can't,
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// If eval is really low check with qsearch if it can exceed alpha, if it can't,
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// return a fail low.
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// return a fail low.
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if (eval < alpha - 474 - 324 * depth * depth)
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if (eval < alpha - 501 - 305 * depth * depth)
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{
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{
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value = qsearch<NonPV>(pos, ss, alpha - 1, alpha);
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value = qsearch<NonPV>(pos, ss, alpha - 1, alpha);
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if (value < alpha)
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if (value < alpha)
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@ -771,23 +771,23 @@ Value Search::Worker::search(
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// Step 8. Futility pruning: child node (~40 Elo)
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// Step 8. Futility pruning: child node (~40 Elo)
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// The depth condition is important for mate finding.
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// The depth condition is important for mate finding.
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if (!ss->ttPv && depth < 11
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if (!ss->ttPv && depth < 12
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&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving, opponentWorsening)
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&& eval - futility_margin(depth, cutNode && !ss->ttHit, improving, opponentWorsening)
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- (ss - 1)->statScore / 252
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- (ss - 1)->statScore / 248
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>= beta
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>= beta
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&& eval >= beta && eval < VALUE_TB_WIN_IN_MAX_PLY && (!ttMove || ttCapture))
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&& eval >= beta && eval < VALUE_TB_WIN_IN_MAX_PLY && (!ttMove || ttCapture))
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return beta > VALUE_TB_LOSS_IN_MAX_PLY ? (eval + beta) / 2 : eval;
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return beta > VALUE_TB_LOSS_IN_MAX_PLY ? (eval + beta) / 2 : eval;
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// Step 9. Null move search with verification search (~35 Elo)
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// Step 9. Null move search with verification search (~35 Elo)
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if (!PvNode && (ss - 1)->currentMove != Move::null() && (ss - 1)->statScore < 15246
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if (!PvNode && (ss - 1)->currentMove != Move::null() && (ss - 1)->statScore < 13999
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&& eval >= beta && ss->staticEval >= beta - 21 * depth + 366 && !excludedMove
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&& eval >= beta && ss->staticEval >= beta - 21 * depth + 390 && !excludedMove
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&& pos.non_pawn_material(us) && ss->ply >= thisThread->nmpMinPly
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&& pos.non_pawn_material(us) && ss->ply >= thisThread->nmpMinPly
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&& beta > VALUE_TB_LOSS_IN_MAX_PLY)
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&& beta > VALUE_TB_LOSS_IN_MAX_PLY)
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{
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{
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assert(eval - beta >= 0);
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assert(eval - beta >= 0);
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// Null move dynamic reduction based on depth and eval
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// Null move dynamic reduction based on depth and eval
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Depth R = std::min(int(eval - beta) / 152, 6) + depth / 3 + 5;
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Depth R = std::min(int(eval - beta) / 177, 6) + depth / 3 + 5;
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ss->currentMove = Move::null();
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ss->currentMove = Move::null();
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ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];
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ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];
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@ -845,7 +845,7 @@ Value Search::Worker::search(
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// Step 11. ProbCut (~10 Elo)
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// Step 11. ProbCut (~10 Elo)
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// If we have a good enough capture (or queen promotion) and a reduced search returns a value
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// If we have a good enough capture (or queen promotion) and a reduced search returns a value
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// much above beta, we can (almost) safely prune the previous move.
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// much above beta, we can (almost) safely prune the previous move.
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probCutBeta = beta + 176 - 65 * improving;
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probCutBeta = beta + 185 - 60 * improving;
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if (
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if (
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!PvNode && depth > 3
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!PvNode && depth > 3
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&& std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY
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&& std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY
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@ -901,7 +901,7 @@ Value Search::Worker::search(
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moves_loop: // When in check, search starts here
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moves_loop: // When in check, search starts here
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// Step 12. A small Probcut idea, when we are in check (~4 Elo)
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// Step 12. A small Probcut idea, when we are in check (~4 Elo)
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probCutBeta = beta + 440;
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probCutBeta = beta + 361;
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if (ss->inCheck && !PvNode && ttCapture && (tte->bound() & BOUND_LOWER)
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if (ss->inCheck && !PvNode && ttCapture && (tte->bound() & BOUND_LOWER)
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&& tte->depth() >= depth - 4 && ttValue >= probCutBeta
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&& tte->depth() >= depth - 4 && ttValue >= probCutBeta
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&& std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY && std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
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&& std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY && std::abs(beta) < VALUE_TB_WIN_IN_MAX_PLY)
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@ -985,15 +985,15 @@ moves_loop: // When in check, search starts here
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// Futility pruning for captures (~2 Elo)
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// Futility pruning for captures (~2 Elo)
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if (!givesCheck && lmrDepth < 7 && !ss->inCheck)
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if (!givesCheck && lmrDepth < 7 && !ss->inCheck)
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{
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{
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Value futilityValue = ss->staticEval + 276 + 256 * lmrDepth
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Value futilityValue = ss->staticEval + 283 + 235 * lmrDepth
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+ PieceValue[capturedPiece] + captHist / 7;
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+ PieceValue[capturedPiece] + captHist / 7;
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if (futilityValue <= alpha)
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if (futilityValue <= alpha)
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continue;
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continue;
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}
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}
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// SEE based pruning for captures and checks (~11 Elo)
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// SEE based pruning for captures and checks (~11 Elo)
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int seeHist = std::clamp(captHist / 32, -177 * depth, 175 * depth);
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int seeHist = std::clamp(captHist / 32, -183 * depth, 162 * depth);
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if (!pos.see_ge(move, -183 * depth - seeHist))
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if (!pos.see_ge(move, -166 * depth - seeHist))
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continue;
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continue;
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}
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}
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else
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else
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@ -1004,18 +1004,18 @@ moves_loop: // When in check, search starts here
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+ thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()];
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+ thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()];
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// Continuation history based pruning (~2 Elo)
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// Continuation history based pruning (~2 Elo)
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if (lmrDepth < 6 && history < -4076 * depth)
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if (lmrDepth < 6 && history < -4427 * depth)
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continue;
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continue;
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history += 2 * thisThread->mainHistory[us][move.from_to()];
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history += 2 * thisThread->mainHistory[us][move.from_to()];
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lmrDepth += history / 4401;
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lmrDepth += history / 3670;
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Value futilityValue =
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Value futilityValue =
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ss->staticEval + (bestValue < ss->staticEval - 53 ? 151 : 57) + 140 * lmrDepth;
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ss->staticEval + (bestValue < ss->staticEval - 51 ? 149 : 55) + 141 * lmrDepth;
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// Futility pruning: parent node (~13 Elo)
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// Futility pruning: parent node (~13 Elo)
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if (!ss->inCheck && lmrDepth < 10 && futilityValue <= alpha)
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if (!ss->inCheck && lmrDepth < 11 && futilityValue <= alpha)
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{
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{
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if (bestValue <= futilityValue && std::abs(bestValue) < VALUE_TB_WIN_IN_MAX_PLY
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if (bestValue <= futilityValue && std::abs(bestValue) < VALUE_TB_WIN_IN_MAX_PLY
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&& futilityValue < VALUE_TB_WIN_IN_MAX_PLY)
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&& futilityValue < VALUE_TB_WIN_IN_MAX_PLY)
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@ -1049,11 +1049,11 @@ moves_loop: // When in check, search starts here
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// margins scale well.
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// margins scale well.
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if (!rootNode && move == ttMove && !excludedMove
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if (!rootNode && move == ttMove && !excludedMove
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&& depth >= 4 - (thisThread->completedDepth > 35) + ss->ttPv
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&& depth >= 4 - (thisThread->completedDepth > 38) + ss->ttPv
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&& std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY && (tte->bound() & BOUND_LOWER)
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&& std::abs(ttValue) < VALUE_TB_WIN_IN_MAX_PLY && (tte->bound() & BOUND_LOWER)
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&& tte->depth() >= depth - 3)
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&& tte->depth() >= depth - 3)
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{
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{
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Value singularBeta = ttValue - (57 + 50 * (ss->ttPv && !PvNode)) * depth / 64;
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Value singularBeta = ttValue - (58 + 64 * (ss->ttPv && !PvNode)) * depth / 64;
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Depth singularDepth = newDepth / 2;
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Depth singularDepth = newDepth / 2;
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ss->excludedMove = move;
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ss->excludedMove = move;
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if (value < singularBeta)
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if (value < singularBeta)
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{
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{
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int doubleMargin = 298 * PvNode - 209 * !ttCapture;
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int doubleMargin = 304 * PvNode - 203 * !ttCapture;
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int tripleMargin = 117 + 252 * PvNode - 270 * !ttCapture + 111 * ss->ttPv;
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int tripleMargin = 117 + 259 * PvNode - 296 * !ttCapture + 97 * ss->ttPv;
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int quadMargin = 471 + 343 * PvNode - 281 * !ttCapture + 217 * ss->ttPv;
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int quadMargin = 486 + 343 * PvNode - 273 * !ttCapture + 232 * ss->ttPv;
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extension = 1 + (value < singularBeta - doubleMargin)
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extension = 1 + (value < singularBeta - doubleMargin)
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+ (value < singularBeta - tripleMargin)
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+ (value < singularBeta - tripleMargin)
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+ (value < singularBeta - quadMargin);
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+ (value < singularBeta - quadMargin);
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depth += ((!PvNode) && (depth < 15));
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depth += ((!PvNode) && (depth < 16));
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}
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}
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// Multi-cut pruning
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// Multi-cut pruning
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@ -1101,7 +1101,7 @@ moves_loop: // When in check, search starts here
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else if (PvNode && move == ttMove && move.to_sq() == prevSq
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else if (PvNode && move == ttMove && move.to_sq() == prevSq
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&& thisThread->captureHistory[movedPiece][move.to_sq()]
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&& thisThread->captureHistory[movedPiece][move.to_sq()]
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[type_of(pos.piece_on(move.to_sq()))]
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[type_of(pos.piece_on(move.to_sq()))]
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> 3748)
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> 3988)
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extension = 1;
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extension = 1;
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}
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}
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@ -1157,10 +1157,10 @@ moves_loop: // When in check, search starts here
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ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
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ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
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+ (*contHist[0])[movedPiece][move.to_sq()]
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+ (*contHist[0])[movedPiece][move.to_sq()]
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+ (*contHist[1])[movedPiece][move.to_sq()] - 5266;
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+ (*contHist[1])[movedPiece][move.to_sq()] - 5169;
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// Decrease/increase reduction for moves with a good/bad history (~8 Elo)
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// Decrease/increase reduction for moves with a good/bad history (~8 Elo)
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r -= ss->statScore / (14519 - std::min(depth, 15) * 103);
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r -= ss->statScore / (12219 - std::min(depth, 13) * 120);
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// Step 17. Late moves reduction / extension (LMR, ~117 Elo)
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// Step 17. Late moves reduction / extension (LMR, ~117 Elo)
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if (depth >= 2 && moveCount > 1 + rootNode)
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if (depth >= 2 && moveCount > 1 + rootNode)
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{
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{
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// Adjust full-depth search based on LMR results - if the result
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// Adjust full-depth search based on LMR results - if the result
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// was good enough search deeper, if it was bad enough search shallower.
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// was good enough search deeper, if it was bad enough search shallower.
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const bool doDeeperSearch = value > (bestValue + 40 + 2 * newDepth); // (~1 Elo)
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const bool doDeeperSearch = value > (bestValue + 36 + 2 * newDepth); // (~1 Elo)
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const bool doShallowerSearch = value < bestValue + newDepth; // (~2 Elo)
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const bool doShallowerSearch = value < bestValue + newDepth; // (~2 Elo)
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newDepth += doDeeperSearch - doShallowerSearch;
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newDepth += doDeeperSearch - doShallowerSearch;
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@ -1340,9 +1340,9 @@ moves_loop: // When in check, search starts here
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// Bonus for prior countermove that caused the fail low
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// Bonus for prior countermove that caused the fail low
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else if (!priorCapture && prevSq != SQ_NONE)
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else if (!priorCapture && prevSq != SQ_NONE)
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{
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{
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int bonus = (depth > 4) + (depth > 5) + (PvNode || cutNode) + ((ss - 1)->statScore < -13241)
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int bonus = (depth > 4) + (depth > 5) + (PvNode || cutNode) + ((ss - 1)->statScore < -14144)
|
||||||
+ ((ss - 1)->moveCount > 10) + (!ss->inCheck && bestValue <= ss->staticEval - 127)
|
+ ((ss - 1)->moveCount > 9) + (!ss->inCheck && bestValue <= ss->staticEval - 115)
|
||||||
+ (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 74);
|
+ (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 81);
|
||||||
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
|
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
|
||||||
stat_bonus(depth) * bonus);
|
stat_bonus(depth) * bonus);
|
||||||
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()]
|
thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()]
|
||||||
|
@ -1513,7 +1513,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
|
||||||
if (bestValue > alpha)
|
if (bestValue > alpha)
|
||||||
alpha = bestValue;
|
alpha = bestValue;
|
||||||
|
|
||||||
futilityBase = ss->staticEval + 264;
|
futilityBase = ss->staticEval + 279;
|
||||||
}
|
}
|
||||||
|
|
||||||
const PieceToHistory* contHist[] = {(ss - 1)->continuationHistory,
|
const PieceToHistory* contHist[] = {(ss - 1)->continuationHistory,
|
||||||
|
@ -1585,11 +1585,11 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
|
||||||
+ (*contHist[1])[pos.moved_piece(move)][move.to_sq()]
|
+ (*contHist[1])[pos.moved_piece(move)][move.to_sq()]
|
||||||
+ thisThread->pawnHistory[pawn_structure_index(pos)][pos.moved_piece(move)]
|
+ thisThread->pawnHistory[pawn_structure_index(pos)][pos.moved_piece(move)]
|
||||||
[move.to_sq()]
|
[move.to_sq()]
|
||||||
<= 4348)
|
<= 4181)
|
||||||
continue;
|
continue;
|
||||||
|
|
||||||
// Do not search moves with bad enough SEE values (~5 Elo)
|
// Do not search moves with bad enough SEE values (~5 Elo)
|
||||||
if (!pos.see_ge(move, -63))
|
if (!pos.see_ge(move, -67))
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -1655,7 +1655,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta,
|
||||||
|
|
||||||
Depth Search::Worker::reduction(bool i, Depth d, int mn, int delta) {
|
Depth Search::Worker::reduction(bool i, Depth d, int mn, int delta) {
|
||||||
int reductionScale = reductions[d] * reductions[mn];
|
int reductionScale = reductions[d] * reductions[mn];
|
||||||
return (reductionScale + 1147 - delta * 755 / rootDelta) / 1024 + (!i && reductionScale > 1125);
|
return (reductionScale + 1222 - delta * 733 / rootDelta) / 1024 + (!i && reductionScale > 1231);
|
||||||
}
|
}
|
||||||
|
|
||||||
// elapsed() returns the time elapsed since the search started. If the
|
// elapsed() returns the time elapsed since the search started. If the
|
||||||
|
@ -1758,7 +1758,7 @@ void update_all_stats(const Position& pos,
|
||||||
|
|
||||||
if (!pos.capture_stage(bestMove))
|
if (!pos.capture_stage(bestMove))
|
||||||
{
|
{
|
||||||
int bestMoveBonus = bestValue > beta + 165 ? quietMoveBonus // larger bonus
|
int bestMoveBonus = bestValue > beta + 176 ? quietMoveBonus // larger bonus
|
||||||
: stat_bonus(depth); // smaller bonus
|
: stat_bonus(depth); // smaller bonus
|
||||||
|
|
||||||
update_quiet_stats(pos, ss, workerThread, bestMove, bestMoveBonus);
|
update_quiet_stats(pos, ss, workerThread, bestMove, bestMoveBonus);
|
||||||
|
@ -1796,7 +1796,7 @@ void update_all_stats(const Position& pos,
|
||||||
// by moves at ply -1, -2, -3, -4, and -6 with current move.
|
// by moves at ply -1, -2, -3, -4, and -6 with current move.
|
||||||
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
|
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
|
||||||
|
|
||||||
bonus = bonus * 45 / 64;
|
bonus = bonus * 47 / 64;
|
||||||
|
|
||||||
for (int i : {1, 2, 3, 4, 6})
|
for (int i : {1, 2, 3, 4, 6})
|
||||||
{
|
{
|
||||||
|
|
Loading…
Add table
Reference in a new issue