X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=a58231d22fe79e85e21a62c3d86a27ec5ad994f2;hp=ff31e0360a76c2c5201cd13e8944024054980fc0;hb=ca6c9f85a5c3a45a248716b8fe68821b20eee201;hpb=1ee2838214fcbadc352fb17c8c6fa1142ae5dcb0

diff --git a/src/search.cpp b/src/search.cpp
index ff31e036..a58231d2 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -622,7 +622,7 @@ namespace {
     // search to overwrite a previous full search TT value, so we use a different
     // position key in case of an excluded move.
     excludedMove = ss->excludedMove;
-    posKey = excludedMove ? pos.exclusion_key() : pos.key();
+    posKey = pos.key() ^ Key(excludedMove);
     tte = TT.probe(posKey, ttHit);
     ttValue = ttHit ? value_from_tt(tte->value(), ss->ply) : VALUE_NONE;
     ttMove =  rootNode ? thisThread->rootMoves[thisThread->PVIdx].pv[0]
@@ -650,7 +650,7 @@ namespace {
             }
 
             // Extra penalty for a quiet TT move in previous ply when it gets refuted
-            if ((ss-1)->moveCount == 1 && !pos.captured_piece_type())
+            if ((ss-1)->moveCount == 1 && !pos.captured_piece())
             {
                 Value penalty = Value(d * d + 4 * d + 1);
                 Square prevSq = to_sq((ss-1)->currentMove);
@@ -725,8 +725,8 @@ namespace {
     // Step 6. Razoring (skipped when in check)
     if (   !PvNode
         &&  depth < 4 * ONE_PLY
-        &&  eval + razor_margin[depth / ONE_PLY] <= alpha
-        &&  ttMove == MOVE_NONE)
+        &&  ttMove == MOVE_NONE
+        &&  eval + razor_margin[depth / ONE_PLY] <= alpha)
     {
         if (   depth <= ONE_PLY
             && eval + razor_margin[3 * ONE_PLY] <= alpha)
@@ -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))
@@ -925,8 +924,8 @@ moves_loop: // When in check search starts from here
           && !captureOrPromotion
           && !inCheck
           && !givesCheck
-          && !pos.advanced_pawn_push(move)
-          &&  bestValue > VALUE_MATED_IN_MAX_PLY)
+          &&  bestValue > VALUE_MATED_IN_MAX_PLY
+          && !pos.advanced_pawn_push(move))
       {
           // Move count based pruning
           if (moveCountPruning)
@@ -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)))
@@ -1140,7 +1138,7 @@ moves_loop: // When in check search starts from here
         }
 
         // Extra penalty for a quiet TT move in previous ply when it gets refuted
-        if ((ss-1)->moveCount == 1 && !pos.captured_piece_type())
+        if ((ss-1)->moveCount == 1 && !pos.captured_piece())
         {
             Value penalty = Value(d * d + 4 * d + 1);
             Square prevSq = to_sq((ss-1)->currentMove);
@@ -1149,7 +1147,7 @@ moves_loop: // When in check search starts from here
     }
     // Bonus for prior countermove that caused the fail low
     else if (    depth >= 3 * ONE_PLY
-             && !pos.captured_piece_type()
+             && !pos.captured_piece()
              && is_ok((ss-1)->currentMove))
     {
         int d = depth / ONE_PLY;
@@ -1643,7 +1641,7 @@ void Tablebases::filter_root_moves(Position& pos, Search::RootMoves& rootMoves)
         RootInTB = root_probe_wdl(pos, rootMoves, TB::Score);
 
         // Only probe during search if winning
-        if (TB::Score <= VALUE_DRAW)
+        if (RootInTB && TB::Score <= VALUE_DRAW)
             Cardinality = 0;
     }