X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=9dfa5193e99fd3e2e16889e6182470700aba58fa;hp=ff31e0360a76c2c5201cd13e8944024054980fc0;hb=2731bbaf6b4bed23abaae8de5c1fa9f373e30e57;hpb=1ee2838214fcbadc352fb17c8c6fa1142ae5dcb0

diff --git a/src/search.cpp b/src/search.cpp
index ff31e036..9dfa5193 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -788,9 +788,8 @@ namespace {
     }
 
     // Step 9. ProbCut (skipped when in check)
-    // If we have a very good capture (i.e. SEE > seeValues[captured_piece_type])
-    // and a reduced search returns a value much above beta, we can (almost)
-    // safely prune the previous move.
+    // If we have a good enough capture and a reduced search returns a value
+    // much above beta, we can (almost) safely prune the previous move.
     if (   !PvNode
         &&  depth >= 5 * ONE_PLY
         &&  abs(beta) < VALUE_MATE_IN_MAX_PLY)
@@ -802,7 +801,7 @@ namespace {
         assert((ss-1)->currentMove != MOVE_NONE);
         assert((ss-1)->currentMove != MOVE_NULL);
 
-        MovePicker mp(pos, ttMove, PieceValue[MG][pos.captured_piece_type()]);
+        MovePicker mp(pos, ttMove, rbeta - ss->staticEval);
 
         while ((move = mp.next_move()) != MOVE_NONE)
             if (pos.legal(move))
@@ -936,7 +935,6 @@ moves_loop: // When in check search starts from here
 
           // Countermoves based pruning
           if (   predictedDepth < 3 * ONE_PLY
-              && move != ss->killers[0]
               && (!cmh  || (*cmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
               && (!fmh  || (*fmh )[moved_piece][to_sq(move)] < VALUE_ZERO)
               && (!fmh2 || (*fmh2)[moved_piece][to_sq(move)] < VALUE_ZERO || (cmh && fmh)))