simplify statScore

test r15
dhbloo · Jun 14, 2024 · dfb8929 · dfb8929
1 parent 190b2a1
commit dfb8929
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 5 deletions.
diff --git a/Rapfi/search/ab/search.cpp b/Rapfi/search/ab/search.cpp
@@ -658,7 +658,6 @@ Value search(Board &board, SearchStack *ss, Value alpha, Value beta, Depth depth
     Pos            bestMove = Pos::NONE;
     HistoryTracker histTracker(board, ss);
     (ss + 2)->killers[0] = (ss + 2)->killers[1] = Pos::NONE;  // Reset killer of grand-children
-    ss->statScore                               = 0;          // Reset statScore
 
     // Update selDepth (selDepth counts from 1, ply from 0)
     if (PvNode && thisThread->selDepth <= ss->ply)
@@ -1133,13 +1132,13 @@ Value search(Board &board, SearchStack *ss, Value alpha, Value beta, Depth depth
                     r -= 1.0f;
             }
 
-            // Update statScore of this node
-            ss->statScore = searchData->mainHistory[self][move][HIST_ATTACK]
+            // Compute statScore of this node
+            int statScore = searchData->mainHistory[self][move][HIST_ATTACK]
                             + searchData->mainHistory[self][move][HIST_QUIET] * 4 / 5 - 3391;
 
             // Decrease/increase reduction for moves with a good/bad history
             // Use less stat score at higher depths
-            r -= ss->statScore * (1.0f / (12633 + 4055 * (depth > 7)));
+            r -= statScore * (1.0f / (12633 + 4055 * (depth > 7)));
 
             // Allow LMR to do deeper search in some circumstances
             // Clamp the LMR depth to newDepth (no depth less than one)

diff --git a/Rapfi/search/ab/searchstack.h b/Rapfi/search/ab/searchstack.h
@@ -36,7 +36,6 @@ struct SearchStack
     int        moveCount;
     Depth      extraExtension;  /// cumulative extension depth that larger than one ply
     int        dbValueDepth;
-    int        statScore;
     Value      staticEval;
     Pos        currentMove;
     Pos        skipMove;