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Partially restore HistoryMax

Browse source 
Should be not useful but better safe than sorry.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-01-15 11:21:00 +01:00
parent 13a42284b6
commit 877b468e3e
2 changed files with 6 additions and 8 deletions
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10
src/history.h
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@ -45,6 +45,8 @@ public:
Value gain(Piece p, Square to) const; Value gain(Piece p, Square to) const;
void update_gain(Piece p, Square to, Value delta); void update_gain(Piece p, Square to, Value delta);
static const int MaxValue = (1 << 29); // To avoid an overflow
private: private:
Value history[16][64]; // [piece][to_square] Value history[16][64]; // [piece][to_square]
Value maxGains[16][64]; // [piece][to_square] Value maxGains[16][64]; // [piece][to_square]
@ -60,7 +62,7 @@ inline int History::value(Piece p, Square to) const {
} }
inline void History::update(Piece p, Square to, Value bonus) { inline void History::update(Piece p, Square to, Value bonus) {
history[p][to] += bonus; if (abs(history[p][to]) < MaxValue) history[p][to] += bonus;
} }
inline Value History::gain(Piece p, Square to) const { inline Value History::gain(Piece p, Square to) const {
@ -68,11 +70,7 @@ inline Value History::gain(Piece p, Square to) const {
} }
inline void History::update_gain(Piece p, Square to, Value gain) { inline void History::update_gain(Piece p, Square to, Value gain) {
maxGains[p][to] = (gain >= maxGains[p][to] ? gain : maxGains[p][to] - 1);
if (gain >= maxGains[p][to])
maxGains[p][to] = gain;
else
maxGains[p][to]--;
} }
#endif // !defined(HISTORY_H_INCLUDED) #endif // !defined(HISTORY_H_INCLUDED)

4
src/movepick.cpp
View file

@ -247,10 +247,10 @@ void MovePicker::score_evasions() {
{ {
m = cur->move; m = cur->move;
if ((seeScore = pos.see_sign(m)) < 0) if ((seeScore = pos.see_sign(m)) < 0)
cur->score = seeScore - (1 << 29); // Be sure are at the bottom cur->score = seeScore - History::MaxValue; // Be sure we are at the bottom
else if (pos.move_is_capture(m)) else if (pos.move_is_capture(m))
cur->score = pos.midgame_value_of_piece_on(move_to(m)) cur->score = pos.midgame_value_of_piece_on(move_to(m))
- pos.type_of_piece_on(move_from(m)) + (1 << 29); - pos.type_of_piece_on(move_from(m)) + History::MaxValue;
else else
cur->score = H.value(pos.piece_on(move_from(m)), move_to(m)); cur->score = H.value(pos.piece_on(move_from(m)), move_to(m));
} }