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removed second killer move

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STC with movepicker rewrite:

LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 46656 W: 12208 L: 11995 D: 22453
Ptnml(0-2): 203, 5461, 11777, 5694, 193
https://tests.stockfishchess.org/tests/view/668d98a15034141ae5999e68

Earlier version passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 468896 W: 120999 L: 120054 D: 227843
Ptnml(0-2): 1207, 55209, 120639, 56218, 1175
https://tests.stockfishchess.org/tests/view/668b17d2cf91c430fca58630

Earlier version passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 550524 W: 139553 L: 139877 D: 271094
Ptnml(0-2): 333, 61646, 151616, 61346, 321
https://tests.stockfishchess.org/tests/view/668b2e04cf91c430fca586b1

closes https://github.com/official-stockfish/Stockfish/pull/5472

bench 1234309

Co-authored-by: rn5f107s2 <clemens.lerchl@gmail.com>
This commit is contained in:
yl25946
2024-07-10 23:49:16 -05:00
committed by Joost VandeVondele
parent 6135a0e2f8
commit 8d1e41458e
4 changed files with 25 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/search.cpp
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@@ -123,7 +123,7 @@ Value value_to_tt(Value v, int ply);
Value value_from_tt(Value v, int ply, int r50c);
void update_pv(Move* pv, Move move, const Move* childPv);
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus);
void update_refutations(Stack* ss, Move move);
void update_killer(Stack* ss, Move move);
void update_quiet_histories(
const Position& pos, Stack* ss, Search::Worker& workerThread, Move move, int bonus);
void update_quiet_stats(
@@ -608,9 +608,9 @@ Value Search::Worker::search(
assert(0 <= ss->ply && ss->ply < MAX_PLY);
bestMove = Move::none();
(ss + 2)->killers[0] = (ss + 2)->killers[1] = Move::none();
(ss + 2)->cutoffCnt = 0;
bestMove = Move::none();
(ss + 1)->killer = Move::none();
(ss + 2)->cutoffCnt = 0;
Square prevSq = ((ss - 1)->currentMove).is_ok() ? ((ss - 1)->currentMove).to_sq() : SQ_NONE;
ss->statScore = 0;
@@ -934,7 +934,7 @@ moves_loop: // When in check, search starts here
MovePicker mp(pos, ttData.move, depth, &thisThread->mainHistory, &thisThread->captureHistory,
contHist, &thisThread->pawnHistory, ss->killers);
contHist, &thisThread->pawnHistory, ss->killer);
value = bestValue;
moveCountPruning = false;
@@ -1157,7 +1157,7 @@ moves_loop: // When in check, search starts here
// Increase reduction for cut nodes (~4 Elo)
if (cutNode)
r += 2 - (ttData.depth >= depth && ss->ttPv)
+ (!ss->ttPv && move != ttData.move && move != ss->killers[0]);
+ (!ss->ttPv && move != ttData.move && move != ss->killer);
// Increase reduction if ttMove is a capture (~3 Elo)
if (ttCapture)
@@ -1801,7 +1801,7 @@ void update_all_stats(const Position& pos,
// main killer move in previous ply when it gets refuted.
if (prevSq != SQ_NONE
&& ((ss - 1)->moveCount == 1 + (ss - 1)->ttHit
|| ((ss - 1)->currentMove == (ss - 1)->killers[0]))
|| ((ss - 1)->currentMove == (ss - 1)->killer))
&& !pos.captured_piece())
update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq, -quietMoveMalus);
@@ -1832,14 +1832,10 @@ void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
}
// Updates move sorting heuristics
void update_refutations(Stack* ss, Move move) {
void update_killer(Stack* ss, Move move) {
// Update killers
if (ss->killers[0] != move)
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = move;
}
ss->killer = move;
}
void update_quiet_histories(
@@ -1858,7 +1854,7 @@ void update_quiet_histories(
void update_quiet_stats(
const Position& pos, Stack* ss, Search::Worker& workerThread, Move move, int bonus) {
update_refutations(ss, move);
update_killer(ss, move);
update_quiet_histories(pos, ss, workerThread, move, bonus);
}