+ static const Value Max = Value(250);
+
+ const T* operator[](Piece pc) const { return table[pc]; }
+ T* operator[](Piece pc) { return table[pc]; }
+ void clear() { std::memset(table, 0, sizeof(table)); }
+
+ void update(Piece pc, Square to, Move m) {
+
+ if (m != table[pc][to])
+ table[pc][to] = m;
+ }
+
+ void update(Piece pc, Square to, Value v) {
+
+ if (Gain)
+ table[pc][to] = std::max(v, table[pc][to] - 1);
+
+ else if (abs(table[pc][to] + v) < Max)
+ table[pc][to] += v;
+ }
+
+private:
+ T table[PIECE_NB][SQUARE_NB];
+};
+
+typedef Stats< true, Value> GainsStats;
+typedef Stats<false, Value> HistoryStats;
+typedef Stats<false, Move> MovesStats;
+typedef Stats<false, HistoryStats> CounterMovesHistoryStats;