Enable refuation table

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index f303b57684cc545be1a3e83cb3355a1008c4bb10..9d3734b89365c670415c0a9f8070526ea1e4bc90 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -88,6 +88,7 @@ namespace {
   Value DrawValue[COLOR_NB];
   History Hist;
   Gains Gain;
+  RefutationTable Refutation;
 
   template <NodeType NT>
   Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth);
@@ -145,7 +146,7 @@ void Search::init() {
 
   // Init futility move count array
   for (d = 0; d < 32; d++)
-      FutilityMoveCounts[d] = int(3.001 + 0.25 * pow(double(d), 2.0));
+      FutilityMoveCounts[d] = int(3.001 + 0.3 * pow(double(d), 1.8));
 }
 
 
@@ -305,6 +306,7 @@ namespace {
     TT.new_search();
     Hist.clear();
     Gain.clear();
+    Refutation.clear();
 
     PVSize = Options["MultiPV"];
     Skill skill(Options["Skill Level"]);
@@ -764,7 +766,12 @@ namespace {
 
 split_point_start: // At split points actual search starts from here
 
-    MovePicker mp(pos, ttMove, depth, Hist, ss, PvNode ? -VALUE_INFINITE : beta);
+    Move prevMove = (ss-1)->currentMove;
+    Square prevSq = to_sq(prevMove);
+    Piece  prevP  = pos.piece_on(prevSq);
+    Move refutationMove = Refutation.get(prevP, prevSq); 
+
+    MovePicker mp(pos, ttMove, depth, Hist, ss, refutationMove, PvNode ? -VALUE_INFINITE : beta);
     CheckInfo ci(pos);
     value = bestValue; // Workaround a bogus 'uninitialized' warning under gcc
     singularExtensionNode =   !RootNode
@@ -1090,6 +1097,7 @@ split_point_start: // At split points actual search starts from here
             // Increase history value of the cut-off move
             Value bonus = Value(int(depth) * int(depth));
             Hist.update(pos.piece_moved(bestMove), to_sq(bestMove), bonus);
+            Refutation.update(prevP, prevSq, bestMove);
 
             // Decrease history of all the other played non-capture moves
             for (int i = 0; i < playedMoveCount - 1; i++)