opelly/Stockfish
1
0
Fork 0
mirror of https://github.com/opelly27/Stockfish.git synced 2026-05-20 09:47:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

Less reduction for escape moves at ttPv nodes

Browse Source 
At expected PV nodes or nodes which marked as PV node in the hash table,
reduce escape moves even one ply less.

STC:
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 31795 W: 6140 L: 5953 D: 19702
Ptnml(0-2): 525, 3625, 7455, 3695, 583
http://tests.stockfishchess.org/tests/view/5e25d77fc3b97aa0d75bc013

LTC:
LLR: 2.94 (-2.94,2.94) {0.00,2.00}
Total: 43975 W: 5708 L: 5454 D: 32813
Ptnml(0-2): 314, 4012, 13070, 4242, 325
http://tests.stockfishchess.org/tests/view/5e2618c1c3b97aa0d75bc03c

Closes https://github.com/official-stockfish/Stockfish/pull/2505

Bench: 4475583
This commit is contained in:
Stefan Geschwentner
2020-01-21 09:28:58 +01:00
committed by Stéphane Nicolet
parent f63d112c71
commit 56e698ef83
1 changed files with 2 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+2 -3
View File
@@ -625,7 +625,7 @@ namespace {
Move ttMove, move, excludedMove, bestMove; Move ttMove, move, excludedMove, bestMove;
Depth extension, newDepth; Depth extension, newDepth;
Value bestValue, value, ttValue, eval, maxValue; Value bestValue, value, ttValue, eval, maxValue;
bool ttHit, ttPv, inCheck, givesCheck, improving , didLMR, priorCapture; bool ttHit, ttPv, inCheck, givesCheck, improving, didLMR, priorCapture;
bool captureOrPromotion, doFullDepthSearch, moveCountPruning, ttCapture, singularLMR; bool captureOrPromotion, doFullDepthSearch, moveCountPruning, ttCapture, singularLMR;
Piece movedPiece; Piece movedPiece;
int moveCount, captureCount, quietCount; int moveCount, captureCount, quietCount;
@@ -825,7 +825,6 @@ namespace {
&& eval <= alpha - RazorMargin) && eval <= alpha - RazorMargin)
return qsearch<NT>(pos, ss, alpha, beta); return qsearch<NT>(pos, ss, alpha, beta);
// (~13 Elo)
improving = (ss-2)->staticEval == VALUE_NONE ? (ss->staticEval > (ss-4)->staticEval improving = (ss-2)->staticEval == VALUE_NONE ? (ss->staticEval > (ss-4)->staticEval
|| (ss-4)->staticEval == VALUE_NONE) : ss->staticEval > (ss-2)->staticEval; || (ss-4)->staticEval == VALUE_NONE) : ss->staticEval > (ss-2)->staticEval;
@@ -1161,7 +1160,7 @@ moves_loop: // When in check, search starts from here
// hence break make_move(). (~2 Elo) // hence break make_move(). (~2 Elo)
else if ( type_of(move) == NORMAL else if ( type_of(move) == NORMAL
&& !pos.see_ge(reverse_move(move))) && !pos.see_ge(reverse_move(move)))
r -= 2; r -= 2 + ttPv;
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)]