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Introduce Counter Move History tables

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Introduce a counter move history table which additionally is indexed by the last move's piece and target square.
For quiet move ordering use now the sum of standard and counter move history table.

STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 4747 W: 1005 L: 885 D: 2857

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 5726 W: 1001 L: 872 D: 3853

Because of reported low NPS on multi core test
STC (7 threads):
ELO: 7.26 +-3.3 (95%) LOS: 100.0%
Total: 14937 W: 2710 L: 2398 D: 9829

Bench: 7725341

Resolves #282
This commit is contained in:
Stefan Geschwentner
2015-03-12 07:29:57 +00:00
committed by Joona Kiiski
parent 81c7975dcd
commit 13c11f4048
3 changed files with 33 additions and 14 deletions
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9
src/movepick.h
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@@ -43,6 +43,7 @@ struct Stats {
static const Value Max = Value(250);
const T* operator[](Piece pc) const { return table[pc]; }
T* operator[](Piece pc) { return table[pc]; }
void clear() { std::memset(table, 0, sizeof(table)); }
void update(Piece pc, Square to, Move m) {
@@ -70,6 +71,7 @@ private:
typedef Stats< true, Value> GainsStats;
typedef Stats<false, Value> HistoryStats;
typedef Stats<false, std::pair<Move, Move> > MovesStats;
typedef Stats<false, HistoryStats> CounterMovesHistoryStats;
/// MovePicker class is used to pick one pseudo legal move at a time from the
@@ -84,9 +86,9 @@ public:
MovePicker(const MovePicker&) = delete;
MovePicker& operator=(const MovePicker&) = delete;
MovePicker(const Position&, Move, Depth, const HistoryStats&, Square);
MovePicker(const Position&, Move, const HistoryStats&, PieceType);
MovePicker(const Position&, Move, Depth, const HistoryStats&, Move*, Move*, Search::Stack*);
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*, Move*, Search::Stack*);
template<bool SpNode> Move next_move();
@@ -98,6 +100,7 @@ private:
const Position& pos;
const HistoryStats& history;
const CounterMovesHistoryStats& counterMovesHistory;
Search::Stack* ss;
Move* countermoves;
Move* followupmoves;