X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=e02529327435b46f49f4780d591877b201042cbf;hb=314faa905a60962595d610c26727c4b603c6ed62;hp=1786a6fdc60ebb235e708a7d7cfedaa63479987e;hpb=5e340346db94446587c78e791507ab9e2cffe3fa;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index 1786a6fd..e0252932 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -333,14 +333,14 @@ namespace {
 int perft(Position& pos, Depth depth)
 {
     Move move;
-    MovePicker mp = MovePicker(pos, MOVE_NONE, depth, H);
     int sum = 0;
+    MovePicker mp = MovePicker(pos, MOVE_NONE, depth, H);
 
     // If we are at the last ply we don't need to do and undo
     // the moves, just to count them.
     if (depth <= OnePly) // Replace with '<' to test also qsearch
     {
-        while ((move = mp.get_next_move()) != MOVE_NONE) sum++;
+        while (mp.get_next_move()) sum++;
         return sum;
     }
 
@@ -348,10 +348,10 @@ int perft(Position& pos, Depth depth)
     CheckInfo ci(pos);
     while ((move = mp.get_next_move()) != MOVE_NONE)
     {
-      StateInfo st;
-      pos.do_move(move, st, ci, pos.move_is_check(move, ci));
-      sum += perft(pos, depth - OnePly);
-      pos.undo_move(move);
+        StateInfo st;
+        pos.do_move(move, st, ci, pos.move_is_check(move, ci));
+        sum += perft(pos, depth - OnePly);
+        pos.undo_move(move);
     }
     return sum;
 }
@@ -1314,7 +1314,13 @@ namespace {
         ss[ply].currentMove = MOVE_NULL;
 
         pos.do_null_move(st);
-        int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
+
+        // Null move dynamic reduction based on depth
+        int R = (depth >= 5 * OnePly ? 4 : 3);
+
+        // Null move dynamic reduction based on value
+        if (approximateEval - beta > PawnValueMidgame)
+            R++;
 
         nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);