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Simplify away best move count logic

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the only place where it was used it was true with >99% probability so it seemed to not be doing much any more.

Passed STC:
https://tests.stockfishchess.org/tests/view/625f4778d00da81c22dd4c93
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 85152 W: 22487 L: 22406 D: 40259
Ptnml(0-2): 313, 9035, 23818, 9078, 332

Passed LTC:
https://tests.stockfishchess.org/tests/view/625ff1f1b03f22647441a215
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 66776 W: 17768 L: 17673 D: 31335
Ptnml(0-2): 46, 6200, 20792, 6313, 37

close https://github.com/official-stockfish/Stockfish/pull/3993

bench 7280798
This commit is contained in:
Michael Chaly 2022-04-21 15:28:23 +03:00 • committed by Joost VandeVondele
parent 6e0680efa0
commit e41f727f0f
1 changed files with 4 additions and 12 deletions
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16
src/search.cpp
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@ -556,7 +556,7 @@ namespace {
bool givesCheck, improving, didLMR, priorCapture;
bool capture, doFullDepthSearch, moveCountPruning, ttCapture;
Piece movedPiece;
int moveCount, captureCount, quietCount, bestMoveCount, improvement, complexity;
int moveCount, captureCount, quietCount, improvement, complexity;
// Step 1. Initialize node
Thread* thisThread = pos.this_thread();
@ -564,7 +564,7 @@ namespace {
ss->inCheck = pos.checkers();
priorCapture = pos.captured_piece();
Color us = pos.side_to_move();
moveCount = bestMoveCount = captureCount = quietCount = ss->moveCount = 0;
moveCount = captureCount = quietCount = ss->moveCount = 0;
bestValue = -VALUE_INFINITE;
maxValue = VALUE_INFINITE;
@ -1145,11 +1145,6 @@ moves_loop: // When in check, search starts here
{
Depth r = reduction(improving, depth, moveCount, delta, thisThread->rootDelta);
// Decrease reduction at some PvNodes (~2 Elo)
if ( PvNode
&& bestMoveCount <= 3)
r--;
// Decrease reduction if position is or has been on the PV
// and node is not likely to fail low. (~3 Elo)
if ( ss->ttPv
@ -1173,9 +1168,9 @@ moves_loop: // When in check, search starts here
if (PvNode && !ss->inCheck && abs(ss->staticEval - bestValue) > 250)
r--;
// Increase depth based reduction if PvNode
// Decrease reduction for PvNodes based on depth
if (PvNode)
r -= 15 / ( 3 + depth );
r -= 1 + 15 / ( 3 + depth );
ss->statScore = thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
@ -1297,10 +1292,7 @@ moves_loop: // When in check, search starts here
update_pv(ss->pv, move, (ss+1)->pv);
if (PvNode && value < beta) // Update alpha! Always alpha < beta
{
alpha = value;
bestMoveCount++;
}
else
{
assert(value >= beta); // Fail high