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Code Issues Releases Wiki Activity

Simplify LMR

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as it seems not to bring any strength and thus is no longer needed.

Tests for updating elo estimates:
https://tests.stockfishchess.org/tests/view/6099ff123a33eb67a844f789
https://tests.stockfishchess.org/tests/view/60953e6695e7f1852abd305b

Individual simplification tests:
https://tests.stockfishchess.org/tests/view/6098cfc73a33eb67a844f6a1
https://tests.stockfishchess.org/tests/view/6095539495e7f1852abd308b

LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 96984 W: 3624 L: 3608 D: 89752
Ptnml(0-2): 45, 3222, 41939, 3244, 42
https://tests.stockfishchess.org/tests/view/6099921a3a33eb67a844f74f

closes https://github.com/official-stockfish/Stockfish/pull/3458

bench: 3836428
This commit is contained in:
bmc4 2021-05-11 11:04:02 -03:00 • committed by Joost VandeVondele
parent 58054fd0fa
commit 602687801b
1 changed files with 2 additions and 14 deletions
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16
src/search.cpp
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@ -1206,16 +1206,11 @@ moves_loop: // When in check, search starts from here
&& thisThread->bestMoveChanges <= 2) && thisThread->bestMoveChanges <= 2)
r++; r++;
// More reductions for late moves if position was not in previous PV
if ( moveCountPruning
&& !formerPv)
r++;
// Decrease reduction if opponent's move count is high (~5 Elo) // Decrease reduction if opponent's move count is high (~5 Elo)
if ((ss-1)->moveCount > 13) if ((ss-1)->moveCount > 13)
r--; r--;
// Decrease reduction if ttMove has been singularly extended (~3 Elo) // Decrease reduction if ttMove has been singularly extended (~1 Elo)
if (singularQuietLMR) if (singularQuietLMR)
r--; r--;
@ -1228,7 +1223,7 @@ moves_loop: // When in check, search starts from here
} }
else else
{ {
// Increase reduction if ttMove is a capture (~5 Elo) // Increase reduction if ttMove is a capture (~3 Elo)
if (ttCapture) if (ttCapture)
r++; r++;
@ -1239,13 +1234,6 @@ moves_loop: // When in check, search starts from here
if (cutNode) if (cutNode)
r += 2; r += 2;
// Decrease reduction for moves that escape a capture. Filter out
// castling moves, because they are coded as "king captures rook" and
// hence break reverse_move() (~2 Elo)
else if ( type_of(move) == NORMAL
&& !pos.see_ge(reverse_move(move)))
r -= 2 + ss->ttPv - (type_of(movedPiece) == PAWN);
ss->statScore = thisThread->mainHistory[us][from_to(move)] ss->statScore = thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)] + (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)] + (*contHist[1])[movedPiece][to_sq(move)]