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Reintroduce gains

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This seems a die hard idea :-)

Passed both short TC
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 17485 W: 3307 L: 3156 D: 11022

And long TC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 38181 W: 6002 L: 5729 D: 26450

bench: 8659830
This commit is contained in:
Joona Kiiski
2013-11-10 14:53:23 +00:00
committed by Marco Costalba
parent 4ef6b2c32a
commit b9768b8bc5
2 changed files with 31 additions and 14 deletions
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17
src/movepick.h
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@@ -30,13 +30,14 @@
/// The Stats struct stores moves statistics. According to the template parameter
/// the class can store History and Countermoves. History records how often
/// the class can store History, Gains and Countermoves. History records how often
/// different moves have been successful or unsuccessful during the current search
/// and is used for reduction and move ordering decisions.
/// and is used for reduction and move ordering decisions. Gains records the move's
/// best evaluation gain from one ply to the next and is used for pruning decisions.
/// Countermoves store the move that refute a previous one. Entries are stored
/// according only to moving piece and destination square, hence two moves with
/// different origin but same destination and piece will be considered identical.
template<typename T>
template<bool Gain, typename T>
struct Stats {
static const Value Max = Value(2000);
@@ -55,7 +56,10 @@ struct Stats {
void update(Piece p, Square to, Value v) {
if (abs(table[p][to] + v) < Max)
if (Gain)
table[p][to] = std::max(v, table[p][to] - 1);
else if (abs(table[p][to] + v) < Max)
table[p][to] += v;
}
@@ -63,8 +67,9 @@ private:
T table[PIECE_NB][SQUARE_NB];
};
typedef Stats<Value> HistoryStats;
typedef Stats<std::pair<Move, Move> > CountermovesStats;
typedef Stats< true, Value> GainsStats;
typedef Stats<false, Value> HistoryStats;
typedef Stats<false, std::pair<Move, Move> > CountermovesStats;
/// MovePicker class is used to pick one pseudo legal move at a time from the