X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=ef3be6c240f8d553b42c68756e48fa512b5bdf3d;hp=c19141820e3397804580a06fbc8b02df12e5e7a0;hb=ced29248c93de7fc5a4e284807f8f052006e647c;hpb=352bd6f5aa348e15909f50266fc5bdc003df35bf

diff --git a/src/movepick.h b/src/movepick.h
index c1914182..ef3be6c2 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -42,7 +42,11 @@ struct HistoryStats {
     Square from = from_sq(m);
     Square to = to_sq(m);
 
-    table[c][from][to] -= table[c][from][to] * abs(int(v)) / 324;
+    const int denom = 324;
+
+    assert(abs(int(v)) <= denom); // Needed for stability.
+
+    table[c][from][to] -= table[c][from][to] * abs(int(v)) / denom;
     table[c][from][to] += int(v) * 32;
   }
 
@@ -62,10 +66,15 @@ struct Stats {
   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 fill(const Value& v) { std::fill(&table[0][0], &table[PIECE_NB-1][SQUARE_NB-1]+1, v); };
   void update(Piece pc, Square to, Move m) { table[pc][to] = m; }
   void update(Piece pc, Square to, Value v) {
 
-    table[pc][to] -= table[pc][to] * abs(int(v)) / 936;
+    const int denom = 936;
+
+    assert(abs(int(v)) <= denom); // Needed for stability.
+
+    table[pc][to] -= table[pc][to] * abs(int(v)) / denom;
     table[pc][to] += int(v) * 32;
   }