From: Joost VandeVondele <Joost.VandeVondele@gmail.com>
Date: Fri, 17 Mar 2017 21:45:27 +0000 (-0700)
Subject: History stat bonus: Move condition to bonus calculation
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=c80d52c845357db880817d6ed91d02986b5d5384;ds=sidebyside

History stat bonus: Move condition to bonus calculation

about 0.5% speedup.

No functional change

Closes #1034
---

diff --git a/src/movepick.h b/src/movepick.h
index 0ef2c89b..e1a2e6df 100644
--- a/src/movepick.h
+++ b/src/movepick.h
@@ -39,9 +39,6 @@ struct HistoryStats {
   void clear() { std::memset(table, 0, sizeof(table)); }
   void update(Color c, Move m, Value v) {
 
-    if (abs(int(v)) >= 324)
-        return;
-
     Square from = from_sq(m);
     Square to = to_sq(m);
 
@@ -68,9 +65,6 @@ struct Stats {
   void update(Piece pc, Square to, Move m) { table[pc][to] = m; }
   void update(Piece pc, Square to, Value v) {
 
-    if (abs(int(v)) >= 324)
-        return;
-
     table[pc][to] -= table[pc][to] * abs(int(v)) / 936;
     table[pc][to] += int(v) * 32;
   }
diff --git a/src/search.cpp b/src/search.cpp
index cb16798d..88af0840 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -82,7 +82,7 @@ namespace {
   // History and stats update bonus, based on depth
   Value stat_bonus(Depth depth) {
     int d = depth / ONE_PLY ;
-    return Value(d * d + 2 * d - 2);
+    return d > 17 ? VALUE_ZERO : Value(d * d + 2 * d - 2);
   }
 
   // Skill structure is used to implement strength limit