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Simplification to use only one counter move.

Browse Source 
STC http://tests.stockfishchess.org/tests/view/5518dca30ebc5902160ec5d0
LLR: 2.95 (-2.94,2.94) [-3.50,0.50]
Total: 18868 W: 3638 L: 3530 D: 11700

LTC http://tests.stockfishchess.org/tests/view/5518f7ed0ebc5902160ec5d4
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 69767 W: 11019 L: 10973 D: 47775

Extracted from http://tests.stockfishchess.org/tests/view/5511028a0ebc5902160ec40b

Original patch by hxim.  All credit goes to him.

Bench: 7664249

Resolves #320
This commit is contained in:
mstembera
2015-04-03 01:16:15 +08:00
committed by Gary Linscott
parent 6c42575208
commit 6661a31541
3 changed files with 17 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/movepick.h
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@@ -48,11 +48,8 @@ struct Stats {
void update(Piece pc, Square to, Move m) {
if (m == table[pc][to].first)
return;
table[pc][to].second = table[pc][to].first;
table[pc][to].first = m;
if (m != table[pc][to])
table[pc][to] = m;
}
void update(Piece pc, Square to, Value v) {
@@ -70,7 +67,7 @@ private:
typedef Stats< true, Value> GainsStats;
typedef Stats<false, Value> HistoryStats;
typedef Stats<false, std::pair<Move, Move> > MovesStats;
typedef Stats<false, Move> MovesStats;
typedef Stats<false, HistoryStats> CounterMovesHistoryStats;
@@ -88,7 +85,7 @@ public:
MovePicker(const Position&, Move, Depth, const HistoryStats&, const CounterMovesHistoryStats&, Square);
MovePicker(const Position&, Move, const HistoryStats&, const CounterMovesHistoryStats&, PieceType);
MovePicker(const Position&, Move, Depth, const HistoryStats&, const CounterMovesHistoryStats&, Move*, Search::Stack*);
MovePicker(const Position&, Move, Depth, const HistoryStats&, const CounterMovesHistoryStats&, Move, Search::Stack*);
template<bool SpNode> Move next_move();
@@ -102,10 +99,10 @@ private:
const HistoryStats& history;
const CounterMovesHistoryStats& counterMovesHistory;
Search::Stack* ss;
Move* countermoves;
Move countermove;
Depth depth;
Move ttMove;
ExtMove killers[4];
ExtMove killers[3];
Square recaptureSquare;
Value captureThreshold;
int stage;