Use more continuation histories.

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index d4f8ab092a8784607d03c0197d7e83f42285e55e..bc3fcf7ed6b8f53a955c582275d91d9a309e96c6 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -55,11 +55,11 @@ namespace {
 } // namespace
 
 
-/// Constructors of the MovePicker class. As arguments we pass information
-/// to help it to return the (presumably) good moves first, to decide which
+/// Constructors of the MovePicker class. As arguments, we pass information
+/// to help it return the (presumably) good moves first, to decide which
 /// moves to return (in the quiescence search, for instance, we only want to
-/// search captures, promotions, and some checks) and how important good move
-/// ordering is at the current node.
+/// search captures, promotions, and some checks) and how important a good
+/// move ordering is at the current node.
 
 /// MovePicker constructor for the main search
 MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHistory* mh,
@@ -141,6 +141,7 @@ void MovePicker::score() {
           m.value =  2 * (*mainHistory)[pos.side_to_move()][from_to(m)];
           m.value += 2 * (*continuationHistory[0])[pc][to];
           m.value +=     (*continuationHistory[1])[pc][to];
+          m.value +=     (*continuationHistory[2])[pc][to] / 4;
           m.value +=     (*continuationHistory[3])[pc][to];
           m.value +=     (*continuationHistory[5])[pc][to];