X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fsearch.cpp;h=1d84102303989cce47a9e3ea2615ec623d8fd159;hb=b748b46714d5f8e0acca0a042ede1fc95e4f5190;hp=fa592a859947e09e1f30fcefb8bd276ccccec16f;hpb=f3b296c2e2061951d366edfbd5287f336e865553;p=stockfish

diff --git a/src/search.cpp b/src/search.cpp
index fa592a85..1d841023 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -165,7 +165,7 @@ namespace {
   uint64_t perft(Position& pos, Depth depth) {
 
     StateInfo st;
-    ASSERT_ALIGNED(&st, Eval::NNUE::kCacheLineSize);
+    ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize);
 
     uint64_t cnt, nodes = 0;
     const bool leaf = (depth == 2);
@@ -597,7 +597,7 @@ namespace {
 
     Move pv[MAX_PLY+1], capturesSearched[32], quietsSearched[64];
     StateInfo st;
-    ASSERT_ALIGNED(&st, Eval::NNUE::kCacheLineSize);
+    ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize);
 
     TTEntry* tte;
     Key posKey;
@@ -612,13 +612,12 @@ namespace {
 
     // Step 1. Initialize node
     Thread* thisThread = pos.this_thread();
-    ss->inCheck = pos.checkers();
-    priorCapture = pos.captured_piece();
-    Color us = pos.side_to_move();
-    moveCount = captureCount = quietCount = ss->moveCount = 0;
-    bestValue = -VALUE_INFINITE;
-    maxValue = VALUE_INFINITE;
-    ss->distanceFromPv = (PvNode ? 0 : ss->distanceFromPv);
+    ss->inCheck        = pos.checkers();
+    priorCapture       = pos.captured_piece();
+    Color us           = pos.side_to_move();
+    moveCount          = captureCount = quietCount = ss->moveCount = 0;
+    bestValue          = -VALUE_INFINITE;
+    maxValue           = VALUE_INFINITE;
 
     // Check for the available remaining time
     if (thisThread == Threads.main())
@@ -917,6 +916,7 @@ namespace {
             return probCutBeta;
 
         assert(probCutBeta < VALUE_INFINITE);
+
         MovePicker mp(pos, ttMove, probCutBeta - ss->staticEval, &captureHistory);
         int probCutCount = 0;
         bool ttPv = ss->ttPv;
@@ -1121,6 +1121,7 @@ moves_loop: // When in check, search starts from here
       {
           Value singularBeta = ttValue - ((formerPv + 4) * depth) / 2;
           Depth singularDepth = (depth - 1 + 3 * formerPv) / 2;
+
           ss->excludedMove = move;
           value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
           ss->excludedMove = MOVE_NONE;
@@ -1157,11 +1158,6 @@ moves_loop: // When in check, search starts from here
                && (pos.is_discovered_check_on_king(~us, move) || pos.see_ge(move)))
           extension = 1;
 
-      // Last captures extension
-      else if (   PieceValue[EG][pos.captured_piece()] > PawnValueEg
-               && pos.non_pawn_material() <= 2 * RookValueMg)
-          extension = 1;
-
       // Add extension to new depth
       newDepth += extension;
 
@@ -1178,8 +1174,6 @@ moves_loop: // When in check, search starts from here
       // Step 15. Make the move
       pos.do_move(move, st, givesCheck);
 
-      (ss+1)->distanceFromPv = ss->distanceFromPv + moveCount - 1;
-
       // Step 16. Late moves reduction / extension (LMR, ~200 Elo)
       // We use various heuristics for the sons of a node after the first son has
       // been searched. In general we would like to reduce them, but there are many
@@ -1205,15 +1199,19 @@ moves_loop: // When in check, search starts from here
 
           // 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)
+          if (   ss->ttPv
+              && !likelyFailLow)
               r -= 2;
 
           // Increase reduction at root and non-PV nodes when the best move does not change frequently
-          if ((rootNode || !PvNode) && thisThread->rootDepth > 10 && thisThread->bestMoveChanges <= 2)
+          if (   (rootNode || !PvNode)
+              && thisThread->rootDepth > 10
+              && thisThread->bestMoveChanges <= 2)
               r++;
 
           // More reductions for late moves if position was not in previous PV
-          if (moveCountPruning && !formerPv)
+          if (   moveCountPruning
+              && !formerPv)
               r++;
 
           // Decrease reduction if opponent's move count is high (~5 Elo)
@@ -1226,7 +1224,7 @@ moves_loop: // When in check, search starts from here
 
           if (captureOrPromotion)
           {
-              // Unless giving check, this capture is likely bad
+              // Increase reduction for non-checking captures likely to be bad
               if (   !givesCheck
                   && ss->staticEval + PieceValue[EG][pos.captured_piece()] + 210 * depth <= alpha)
                   r++;
@@ -1246,7 +1244,7 @@ moves_loop: // When in check, search starts from here
 
               // Decrease reduction for moves that escape a capture. Filter out
               // castling moves, because they are coded as "king captures rook" and
-              // hence break make_move(). (~2 Elo)
+              // hence break reverse_move() (~2 Elo)
               else if (    type_of(move) == NORMAL
                        && !pos.see_ge(reverse_move(move)))
                   r -= 2 + ss->ttPv - (type_of(movedPiece) == PAWN);
@@ -1274,10 +1272,10 @@ moves_loop: // When in check, search starts from here
                   r -= ss->statScore / 14790;
           }
 
-          // In general we want to cap the LMR depth search at newDepth. But for nodes
-          // close to the principal variation the cap is at (newDepth + 1), which will
-          // allow these nodes to be searched deeper than the pv (up to 4 plies deeper).
-          Depth d = std::clamp(newDepth - r, 1, newDepth + ((ss+1)->distanceFromPv <= 4));
+          // In general we want to cap the LMR depth search at newDepth. But if
+          // reductions are really negative and movecount is low, we allow this move
+          // to be searched deeper than the first move.
+          Depth d = std::clamp(newDepth - r, 1, newDepth + (r < -1 && moveCount <= 5));
 
           value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);
 
@@ -1408,8 +1406,9 @@ moves_loop: // When in check, search starts from here
     assert(moveCount || !ss->inCheck || excludedMove || !MoveList<LEGAL>(pos).size());
 
     if (!moveCount)
-        bestValue = excludedMove ? alpha
-                   :     ss->inCheck ? mated_in(ss->ply) : VALUE_DRAW;
+        bestValue = excludedMove ? alpha :
+                    ss->inCheck  ? mated_in(ss->ply)
+                                 : VALUE_DRAW;
 
     // If there is a move which produces search value greater than alpha we update stats of searched moves
     else if (bestMove)
@@ -1459,7 +1458,7 @@ moves_loop: // When in check, search starts from here
 
     Move pv[MAX_PLY+1];
     StateInfo st;
-    ASSERT_ALIGNED(&st, Eval::NNUE::kCacheLineSize);
+    ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize);
 
     TTEntry* tte;
     Key posKey;
@@ -1579,7 +1578,7 @@ moves_loop: // When in check, search starts from here
       if (    bestValue > VALUE_TB_LOSS_IN_MAX_PLY
           && !givesCheck
           &&  futilityBase > -VALUE_KNOWN_WIN
-          && !pos.advanced_pawn_push(move))
+          &&  type_of(move) != PROMOTION)
       {
 
           if (moveCount > 2)
@@ -1965,7 +1964,7 @@ string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
 bool RootMove::extract_ponder_from_tt(Position& pos) {
 
     StateInfo st;
-    ASSERT_ALIGNED(&st, Eval::NNUE::kCacheLineSize);
+    ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize);
 
     bool ttHit;