HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-23 02:27:00 +08:00
Code Issues Packages Projects Releases Wiki Activity

Revert "Retire eval margin and gains"

Browse Source 
This reverts commit ecd07e51d0.

Patch was incorrect and partial. It will be reapplied in
the correct form.

bench: 9189063
This commit is contained in:
Marco Costalba
2013-11-07 22:29:07 +01:00
parent 13d1f0ae43
commit 343544f3f7
7 changed files with 112 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/movepick.h
View File

@@ -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