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Convert gains to use a piece-to mapping

Browse source 
Instead of piece-from-to, in this way it is similar
to what we already do for history.

Almost no change, but seems a bit simpler in this way.

After 995 games at 1+0
Mod vs Orig +207 =596 -192 +5 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-02-02 09:10:15 +01:00
parent 770db27164
commit 439aea9ab7
3 changed files with 12 additions and 12 deletions
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14
src/history.cpp
View file

@ -42,7 +42,7 @@ History::History() { clear(); }
void History::clear() {
memset(history, 0, 2 * 8 * 64 * sizeof(int));
memset(maxStaticValueDelta, 0, 16 * 64 * 64 * sizeof(int));
memset(maxStaticValueDelta, 0, 2 * 8 * 64 * sizeof(int));
}
@ -101,15 +101,15 @@ int History::move_ordering_score(Piece p, Square to) const {
/// gain of a move given the delta of the static position evaluations
/// before and after the move.
void History::set_gain(Piece p, Square from, Square to, Value delta)
void History::set_gain(Piece p, Square to, Value delta)
{
if (delta >= maxStaticValueDelta[p][from][to])
maxStaticValueDelta[p][from][to] = delta;
if (delta >= maxStaticValueDelta[p][to])
maxStaticValueDelta[p][to] = delta;
else
maxStaticValueDelta[p][from][to]--;
maxStaticValueDelta[p][to]--;
}
Value History::gain(Piece p, Square from, Square to) const
Value History::gain(Piece p, Square to) const
{
return Value(maxStaticValueDelta[p][from][to]);
return Value(maxStaticValueDelta[p][to]);
}

6
src/history.h
View file

@ -50,12 +50,12 @@ public:
void success(Piece p, Square to, Depth d);
void failure(Piece p, Square to, Depth d);
int move_ordering_score(Piece p, Square to) const;
void set_gain(Piece p, Square from, Square to, Value delta);
Value gain(Piece p, Square from, Square to) const;
void set_gain(Piece p, Square to, Value delta);
Value gain(Piece p, Square to) const;
private:
int history[16][64]; // [piece][square]
int maxStaticValueDelta[16][64][64]; // [piece][from_square][to_square]
int maxStaticValueDelta[16][64]; // [piece][from_square][to_square]
};

4
src/search.cpp
View file

@ -1607,7 +1607,7 @@ namespace {
if (predictedDepth >= OnePly)
preFutilityValueMargin = FutilityMargins[int(predictedDepth)];
preFutilityValueMargin += H.gain(pos.piece_on(move_from(move)), move_from(move), move_to(move)) + 45;
preFutilityValueMargin += H.gain(pos.piece_on(move_from(move)), move_to(move)) + 45;
futilityValueScaled = ss[ply].eval + preFutilityValueMargin - moveCount * IncrementalFutilityMargin;
@ -2704,7 +2704,7 @@ namespace {
&& pos.captured_piece() == NO_PIECE_TYPE
&& !move_is_castle(m)
&& !move_is_promotion(m))
H.set_gain(pos.piece_on(move_to(m)), move_from(m), move_to(m), -(before + after));
H.set_gain(pos.piece_on(move_to(m)), move_to(m), -(before + after));
}