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

Reduce countermoves less in LMR

Browse Source 
Passed SPRT for both short TC 15+0.05:
LLR: 2.95 (-2.94,2.94)
Total: 17724 W: 3756 L: 3598 D: 10370

And long TC 60+0.05:
LLR: 2.95 (-2.94,2.94)
Total: 22672 W: 4232 L: 4011 D: 14429

bench: 4418832
This commit is contained in:
Marco Costalba
2013-05-19 21:32:52 +02:00
parent 8ceef92266
commit 77547a4ef1
3 changed files with 13 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+9 -5
View File
@@ -766,7 +766,11 @@ namespace {
split_point_start: // At split points actual search starts from here
MovePicker mp(pos, ttMove, depth, History, Countermoves, ss, PvNode ? -VALUE_INFINITE : beta);
Square prevMoveSq = to_sq((ss-1)->currentMove);
Move countermoves[] = { Countermoves[pos.piece_on(prevMoveSq)][prevMoveSq].first,
Countermoves[pos.piece_on(prevMoveSq)][prevMoveSq].second };
MovePicker mp(pos, ttMove, depth, History, countermoves, ss, PvNode ? -VALUE_INFINITE : beta);
CheckInfo ci(pos);
value = bestValue; // Workaround a bogus 'uninitialized' warning under gcc
singularExtensionNode = !RootNode
@@ -942,6 +946,9 @@ split_point_start: // At split points actual search starts from here
&& move != ss->killers[1])
{
ss->reduction = reduction<PvNode>(depth, moveCount);
if (move == countermoves[0] || move == countermoves[1])
ss->reduction = std::max(DEPTH_ZERO, ss->reduction-ONE_PLY);
Depth d = std::max(newDepth - ss->reduction, ONE_PLY);
if (SpNode)
alpha = splitPoint->alpha;
@@ -1093,10 +1100,7 @@ split_point_start: // At split points actual search starts from here
Value bonus = Value(int(depth) * int(depth));
History.update(pos.piece_moved(bestMove), to_sq(bestMove), bonus);
if (is_ok((ss-1)->currentMove))
{
Square prevSq = to_sq((ss-1)->currentMove);
Countermoves.update(pos.piece_on(prevSq), prevSq, bestMove);
}
Countermoves.update(pos.piece_on(prevMoveSq), prevMoveSq, bestMove);
// Decrease history of all the other played non-capture moves
for (int i = 0; i < playedMoveCount - 1; i++)