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Use Color-From-To history stats to help sort moves

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STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 33502 W: 6498 L: 6223 D: 20781
http://tests.stockfishchess.org/tests/view/578abb940ebc5972faa169e2

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 50782 W: 7124 L: 6832 D: 36826
http://tests.stockfishchess.org/tests/view/578b8e5d0ebc5972faa169fd

LTC: (Sanity test against latest master)
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 32759 W: 4600 L: 4370 D: 23789
http://tests.stockfishchess.org/tests/view/5798b7d30ebc591c761f5b72

bench: 6985912

P.S. Thanks @mstembera for rewriting my code to make it smp compatible. A BIG thank you!
This commit is contained in:
VoyagerOne
2016-07-25 09:53:18 -04:00
committed by Marco Costalba
parent 85924db496
commit b3525fa9ea
4 changed files with 36 additions and 4 deletions
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20
src/movepick.h
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@@ -66,6 +66,26 @@ typedef Stats<Value, false> HistoryStats;
typedef Stats<Value, true> CounterMoveStats;
typedef Stats<CounterMoveStats> CounterMoveHistoryStats;
struct FromToStats {
Value get(Color c, Move m) const { return table[c][from_sq(m)][to_sq(m)]; }
void clear() { std::memset(table, 0, sizeof(table)); }
void update(Color c, Move m, Value v)
{
if (abs(int(v)) >= 324)
return;
Square f = from_sq(m);
Square t = to_sq(m);
table[c][f][t] -= table[c][f][t] * abs(int(v)) / 324;
table[c][f][t] += int(v) * 32;
}
private:
Value table[COLOR_NB][SQUARE_NB][SQUARE_NB];
};
/// MovePicker class is used to pick one pseudo legal move at a time from the
/// current position. The most important method is next_move(), which returns a