X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.h;h=ee7cf4a445dd257cc39160fd135a53f85e1ac23e;hp=c19141820e3397804580a06fbc8b02df12e5e7a0;hb=c5de4080dba8e9b3248f06bd6c168c22e9fbfd92;hpb=3b7c1a17e4c1214ca84ebb27fde28ae2ac132396

diff --git a/src/movepick.h b/src/movepick.h
index c1914182..ee7cf4a4 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;
   }
 
@@ -65,7 +69,11 @@ struct Stats {
   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;
   }