X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fhistory.cpp;h=6849839ca2305161b24b32e4be106de833126c2f;hp=22116412c863c4e0a5efadbed4abf61931eb7e2b;hb=3e38e61565c9ee6e3ff83dddfae22908bd2594b4;hpb=942c18ef6620967921049ba24f25e08d710c947e

diff --git a/src/history.cpp b/src/history.cpp
index 22116412..6849839c 100644
--- a/src/history.cpp
+++ b/src/history.cpp
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2009 Marco Costalba
+  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -41,7 +41,8 @@ History::History() { clear(); }
 /// History::clear() clears the history tables
 
 void History::clear() {
-  memset(history, 0, 2 * 8 * 64 * sizeof(int));
+  memset(history, 0, 16 * 64 * sizeof(int));
+  memset(maxStaticValueDelta, 0, 16 * 64 * sizeof(int));
 }
 
 
@@ -84,13 +85,14 @@ void History::failure(Piece p, Square to, Depth d) {
 }
 
 
-/// History::move_ordering_score() returns an integer value used to order the
-/// non-capturing moves in the MovePicker class.
+/// History::set_gain() and History::gain() store and retrieve the
+/// gain of a move given the delta of the static position evaluations
+/// before and after the move.
 
-int History::move_ordering_score(Piece p, Square to) const {
+void History::set_gain(Piece p, Square to, Value delta) {
 
-  assert(piece_is_ok(p));
-  assert(square_is_ok(to));
-
-  return history[p][to];
+  if (delta >= maxStaticValueDelta[p][to])
+      maxStaticValueDelta[p][to] = delta;
+  else
+      maxStaticValueDelta[p][to]--;
 }