Better document how history works

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index d6031bda073cce1711ecb843d07798b36baaf16d..3897f4c10048bf7c164d67c4c2e9858e597c3994 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -264,7 +264,7 @@ void MovePicker::score_noncaptures() {
       else if (m == killer2)
           hs = HistoryMax + 1;
       else
-          hs = H.move_ordering_score(pos.piece_on(move_from(m)), m);
+          hs = H.move_ordering_score(pos.piece_on(move_from(m)), move_to(m));
 
       // Ensure history is always preferred to pst
       if (hs > 0)
@@ -287,7 +287,7 @@ void MovePicker::score_evasions() {
           int seeScore = pos.see(m);
           moves[i].score = (seeScore >= 0)? seeScore + HistoryMax : seeScore;
       } else
-          moves[i].score = H.move_ordering_score(pos.piece_on(move_from(m)), m);
+          moves[i].score = H.move_ordering_score(pos.piece_on(move_from(m)), move_to(m));
   }
 }