Remove ThreatByRank

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 01de12a4cea99b662ce0134349be1b3c3dadaeb5..d34e182392843b4874a07b1b5858610a4e78a143 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -86,9 +86,8 @@ namespace {
   }
 
   // Add a small random component to draw evaluations to avoid 3fold-blindness
-  Value value_draw(Depth depth, Thread* thisThread) {
-    return depth < 4 * ONE_PLY ? VALUE_DRAW
-                               : VALUE_DRAW + Value(2 * (thisThread->nodes & 1) - 1);
+  Value value_draw(Thread* thisThread) {
+    return VALUE_DRAW + Value(2 * (thisThread->nodes & 1) - 1);
   }
 
   // Skill structure is used to implement strength limit
@@ -574,7 +573,7 @@ namespace {
         && !rootNode
         && pos.has_game_cycle(ss->ply))
     {
-        alpha = value_draw(depth, pos.this_thread());
+        alpha = value_draw(pos.this_thread());
         if (alpha >= beta)
             return alpha;
     }
@@ -624,7 +623,7 @@ namespace {
             || pos.is_draw(ss->ply)
             || ss->ply >= MAX_PLY)
             return (ss->ply >= MAX_PLY && !inCheck) ? evaluate(pos)
-                                                    : value_draw(depth, pos.this_thread());
+                                                    : value_draw(pos.this_thread());
 
         // Step 3. Mate distance pruning. Even if we mate at the next move our score
         // would be at best mate_in(ss->ply+1), but if alpha is already bigger because
@@ -763,7 +762,7 @@ namespace {
             ss->staticEval = eval = evaluate(pos);
 
         if (eval == VALUE_DRAW)
-            eval = value_draw(depth, thisThread);
+            eval = value_draw(thisThread);
 
         // Can ttValue be used as a better position evaluation?
         if (    ttValue != VALUE_NONE
@@ -1009,7 +1008,7 @@ moves_loop: // When in check, search starts from here
                && pos.advanced_pawn_push(move)
                && pos.pawn_passed(us, to_sq(move)))
           extension = ONE_PLY;
-          
+
       // Castling extension
       if (type_of(move) == CASTLING)
           extension = ONE_PLY;