X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=79942bcdf1cfec5b912aede7cdb246d46b3029ec;hp=28cbffd6d4caa67d66d0210acdcfe7ce7dd5a978;hb=e5cfa14f40a38d99d11a9c048c34858e3145fbcd;hpb=8fec8834715a440ac18e24e130888c2c60bab352

diff --git a/src/search.cpp b/src/search.cpp
index 28cbffd6..79942bcd 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1050,7 +1050,7 @@ moves_loop: // When in check, search starts from here
               if (!pos.see_ge(move, Value(-(31 - std::min(lmrDepth, 18)) * lmrDepth * lmrDepth)))
                   continue;
           }
-          else if (  (!givesCheck || !extension)
+          else if (  !(givesCheck && extension)
                    && !pos.see_ge(move, Value(-199) * (depth / ONE_PLY))) // (~20 Elo)
                   continue;
       }
@@ -1096,7 +1096,7 @@ moves_loop: // When in check, search starts from here
           if ((ss-1)->moveCount > 15)
               r -= ONE_PLY;
 
-          // Decrease reduction if move has been singularly extended
+          // Decrease reduction if ttMove has been singularly extended
           r -= singularLMR * ONE_PLY;
 
           if (!captureOrPromotion)
@@ -1113,7 +1113,7 @@ moves_loop: // When in check, search starts from here
               // castling moves, because they are coded as "king captures rook" and
               // hence break make_move(). (~5 Elo)
               else if (    type_of(move) == NORMAL
-                       && !pos.see_ge(make_move(to_sq(move), from_sq(move))))
+                       && !pos.see_ge(reverse_move(move)))
                   r -= 2 * ONE_PLY;
 
               ss->statScore =  thisThread->mainHistory[us][from_to(move)]
@@ -1603,6 +1603,9 @@ moves_loop: // When in check, search starts from here
     thisThread->mainHistory[us][from_to(move)] << bonus;
     update_continuation_histories(ss, pos.moved_piece(move), to_sq(move), bonus);
 
+    if (type_of(pos.moved_piece(move)) != PAWN)
+        thisThread->mainHistory[us][from_to(reverse_move(move))] << -bonus;
+
     if (is_ok((ss-1)->currentMove))
     {
         Square prevSq = to_sq((ss-1)->currentMove);