Tune search parameters (with Unai Corzo)

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index d77ab691d62b34d68e678801c120ae4d607fbbf5..8f01f785a9e6596c1999289747ccfbdcb4038660 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -839,7 +839,7 @@ namespace {
     // Step 8. Null move search with verification search (~40 Elo)
     if (   !PvNode
         && (ss-1)->currentMove != MOVE_NULL
-        && (ss-1)->statScore < 22661
+        && (ss-1)->statScore < 24185
         &&  eval >= beta
         &&  eval >= ss->staticEval
         &&  ss->staticEval >= beta - 24 * depth - 34 * improving + 162 * ss->ttPv + 159
@@ -1025,12 +1025,12 @@ moves_loop: // When in check, search starts from here
       movedPiece = pos.moved_piece(move);
       givesCheck = pos.gives_check(move);
 
-      // Indicate PvNodes that will probably fail low if node was searched with non-PV search 
+      // Indicate PvNodes that will probably fail low if node was searched with non-PV search
       // at depth equal or greater to current depth and result of this search was far below alpha
-      bool likelyFailLow =    PvNode 
-                           && ttMove 
-                           && (tte->bound() & BOUND_UPPER) 
-                           && ttValue < alpha + 200 + 100 * depth 
+      bool likelyFailLow =    PvNode
+                           && ttMove
+                           && (tte->bound() & BOUND_UPPER)
+                           && ttValue < alpha + 200 + 100 * depth
                            && tte->depth() >= depth;
 
       // Calculate new depth for this move
@@ -1075,7 +1075,7 @@ moves_loop: // When in check, search starts from here
                   &&  (*contHist[0])[movedPiece][to_sq(move)]
                     + (*contHist[1])[movedPiece][to_sq(move)]
                     + (*contHist[3])[movedPiece][to_sq(move)]
-                    + (*contHist[5])[movedPiece][to_sq(move)] / 3 < 26237)
+                    + (*contHist[5])[movedPiece][to_sq(move)] / 3 < 28255)
                   continue;
 
               // Prune moves with negative SEE (~20 Elo)
@@ -1167,7 +1167,7 @@ moves_loop: // When in check, search starts from here
               || moveCountPruning
               || ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha
               || cutNode
-              || (!PvNode && !formerPv && captureHistory[movedPiece][to_sq(move)][type_of(pos.captured_piece())] < 4506)
+              || (!PvNode && !formerPv && captureHistory[movedPiece][to_sq(move)][type_of(pos.captured_piece())] < 3678)
               || thisThread->ttHitAverage < 432 * TtHitAverageResolution * TtHitAverageWindow / 1024))
       {
           Depth r = reduction(improving, depth, moveCount);
@@ -1180,8 +1180,8 @@ moves_loop: // When in check, search starts from here
           if (th.marked())
               r++;
 
-          // Decrease reduction if position is or has been on the PV 
-          // and node is not likely to fail low (~10 Elo)
+          // Decrease reduction if position is or has been on the PV
+          // and node is not likely to fail low. (~10 Elo)
           if (ss->ttPv && !likelyFailLow)
               r -= 2;
 
@@ -1232,7 +1232,7 @@ moves_loop: // When in check, search starts from here
                              + (*contHist[0])[movedPiece][to_sq(move)]
                              + (*contHist[1])[movedPiece][to_sq(move)]
                              + (*contHist[3])[movedPiece][to_sq(move)]
-                             - 5337;
+                             - 4741;
 
               // Decrease/increase reduction by comparing opponent's stat score (~10 Elo)
               if (ss->statScore >= -89 && (ss-1)->statScore < -116)
@@ -1246,9 +1246,9 @@ moves_loop: // When in check, search starts from here
               // use sum of main history and first continuation history with an offset
               if (ss->inCheck)
                   r -= (thisThread->mainHistory[us][from_to(move)]
-                     + (*contHist[0])[movedPiece][to_sq(move)] - 4341) / 16384;
+                     + (*contHist[0])[movedPiece][to_sq(move)] - 3833) / 16384;
               else
-                  r -= ss->statScore / 14382;
+                  r -= ss->statScore / 14790;
           }
 
           Depth d = std::clamp(newDepth - r, 1, newDepth);