X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=079fbf2bc504ffb8b6e480acb9933941fc1798a8;hp=97b7a29ce4dce27735bc8ceb5c5c645bad79757c;hb=6096ca7a95f2f3bc1049b4fe240b21b7fbc389f9;hpb=0363b5435847e66678cd3fa0d8a94e30b9a91663

diff --git a/src/search.cpp b/src/search.cpp
index 97b7a29c..079fbf2b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -52,7 +52,10 @@ using std::endl;
 
 namespace {
 
-  /// Types
+  // Maximum number of allowed moves per position
+  const int MOVES_MAX = 256;
+
+  // Types
   enum NodeType { NonPV, PV };
 
   // Set to true to force running with one thread.
@@ -114,7 +117,7 @@ namespace {
 
   struct RootMove {
 
-    RootMove() : mp_score(0), nodes(0), cumulativeNodes(0) {}
+    RootMove() : mp_score(0), nodes(0) {}
 
     // RootMove::operator<() is the comparison function used when
     // sorting the moves. A move m1 is considered to be better
@@ -128,7 +131,7 @@ namespace {
     Move move;
     Value score;
     int mp_score;
-    int64_t nodes, cumulativeNodes;
+    int64_t nodes;
     Move pv[PLY_MAX_PLUS_2];
   };
 
@@ -141,26 +144,40 @@ namespace {
   public:
     RootMoveList(Position& pos, Move searchMoves[]);
 
+    Move move(int moveNum) const { return moves[moveNum].move; }
+    Move move_pv(int moveNum, int i) const { return moves[moveNum].pv[i]; }
     int move_count() const { return count; }
-    Move get_move(int moveNum) const { return moves[moveNum].move; }
-    Value get_move_score(int moveNum) const { return moves[moveNum].score; }
+    Value move_score(int moveNum) const { return moves[moveNum].score; }
+    int64_t move_nodes(int moveNum) const { return moves[moveNum].nodes; }
+    void add_move_nodes(int moveNum, int64_t nodes) { moves[moveNum].nodes += nodes; }
     void set_move_score(int moveNum, Value score) { moves[moveNum].score = score; }
-    Move get_move_pv(int moveNum, int i) const { return moves[moveNum].pv[i]; }
-    int64_t get_move_cumulative_nodes(int moveNum) const { return moves[moveNum].cumulativeNodes; }
-    void score_moves(const Position& pos);
 
-    void set_move_nodes(int moveNum, int64_t nodes);
     void set_move_pv(int moveNum, const Move pv[]);
+    void score_moves(const Position& pos);
     void sort();
     void sort_multipv(int n);
 
   private:
-    static const int MaxRootMoves = 500;
-    RootMove moves[MaxRootMoves];
+    RootMove moves[MOVES_MAX];
     int count;
   };
 
 
+  // When formatting a move for std::cout we must know if we are in Chess960
+  // or not. To keep using the handy operator<<() on the move the trick is to
+  // embed this flag in the stream itself. Function-like named enum set960 is
+  // used as a custom manipulator and the stream internal general-purpose array,
+  // accessed through ios_base::iword(), is used to pass the flag to the move's
+  // operator<<() that will use it to properly format castling moves.
+  enum set960 {};
+
+  std::ostream& operator<< (std::ostream& os, const set960& m) {
+
+    os.iword(0) = int(m);
+    return os;
+  }
+
+
   /// Adjustments
 
   // Step 6. Razoring
@@ -364,7 +381,7 @@ void init_search() {
 
 int perft(Position& pos, Depth depth)
 {
-    MoveStack mlist[256];
+    MoveStack mlist[MOVES_MAX];
     StateInfo st;
     Move m;
     int sum = 0;
@@ -448,7 +465,6 @@ bool think(const Position& pos, bool infinite, bool ponder, int time[], int incr
   MinimumSplitDepth       = get_option_value_int("Minimum Split Depth") * ONE_PLY;
   MaxThreadsPerSplitPoint = get_option_value_int("Maximum Number of Threads per Split Point");
   MultiPV                 = get_option_value_int("MultiPV");
-  Chess960                = get_option_value_bool("UCI_Chess960");
   UseLogFile              = get_option_value_bool("Use Search Log");
 
   if (UseLogFile)
@@ -534,26 +550,27 @@ namespace {
 
     // Print RootMoveList startup scoring to the standard output,
     // so to output information also for iteration 1.
-    cout << "info depth " << 1
+    cout << set960(p.is_chess960()) // Is enough to set once at the beginning
+         << "info depth " << 1
          << "\ninfo depth " << 1
-         << " score " << value_to_uci(rml.get_move_score(0))
+         << " score " << value_to_uci(rml.move_score(0))
          << " time " << current_search_time()
          << " nodes " << ThreadsMgr.nodes_searched()
          << " nps " << nps()
-         << " pv " << rml.get_move(0) << "\n";
+         << " pv " << rml.move(0) << "\n";
 
     // Initialize
     TT.new_search();
     H.clear();
     init_ss_array(ss, PLY_MAX_PLUS_2);
     pv[0] = pv[1] = MOVE_NONE;
-    ValueByIteration[1] = rml.get_move_score(0);
+    ValueByIteration[1] = rml.move_score(0);
     Iteration = 1;
 
     // Is one move significantly better than others after initial scoring ?
     if (   rml.move_count() == 1
-        || rml.get_move_score(0) > rml.get_move_score(1) + EasyMoveMargin)
-        EasyMove = rml.get_move(0);
+        || rml.move_score(0) > rml.move_score(1) + EasyMoveMargin)
+        EasyMove = rml.move(0);
 
     // Iterative deepening loop
     while (Iteration < PLY_MAX)
@@ -614,9 +631,9 @@ namespace {
             int64_t nodes = ThreadsMgr.nodes_searched();
             if (   Iteration >= 8
                 && EasyMove == pv[0]
-                && (  (   rml.get_move_cumulative_nodes(0) > (nodes * 85) / 100
+                && (  (   rml.move_nodes(0) > (nodes * 85) / 100
                        && current_search_time() > TimeMgr.available_time() / 16)
-                    ||(   rml.get_move_cumulative_nodes(0) > (nodes * 98) / 100
+                    ||(   rml.move_nodes(0) > (nodes * 98) / 100
                        && current_search_time() > TimeMgr.available_time() / 32)))
                 stopSearch = true;
 
@@ -657,7 +674,7 @@ namespace {
     // Print the best move and the ponder move to the standard output
     if (pv[0] == MOVE_NONE)
     {
-        pv[0] = rml.get_move(0);
+        pv[0] = rml.move(0);
         pv[1] = MOVE_NONE;
     }
 
@@ -688,7 +705,7 @@ namespace {
                 << move_to_san(p, pv[1]) // Works also with MOVE_NONE
                 << endl;
     }
-    return rml.get_move_score(0);
+    return rml.move_score(0);
   }
 
 
@@ -699,7 +716,7 @@ namespace {
 
   Value root_search(Position& pos, SearchStack* ss, Move* pv, RootMoveList& rml, Value* alphaPtr, Value* betaPtr) {
 
-    EvalInfo ei;
+    Value margins[2];
     StateInfo st;
     CheckInfo ci(pos);
     int64_t nodes;
@@ -724,7 +741,7 @@ namespace {
 
     // Step 5. Evaluate the position statically
     // At root we do this only to get reference value for child nodes
-    ss->eval = isCheck ? VALUE_NONE : evaluate(pos, ei);
+    ss->eval = isCheck ? VALUE_NONE : evaluate(pos, margins);
 
     // Step 6. Razoring (omitted at root)
     // Step 7. Static null move pruning (omitted at root)
@@ -751,7 +768,7 @@ namespace {
 
             // Pick the next root move, and print the move and the move number to
             // the standard output.
-            move = ss->currentMove = rml.get_move(i);
+            move = ss->currentMove = rml.move(i);
 
             if (current_search_time() >= 1000)
                 cout << "info currmove " << move
@@ -868,7 +885,7 @@ namespace {
                 break;
 
             // Remember searched nodes counts for this move
-            rml.set_move_nodes(i, ThreadsMgr.nodes_searched() - nodes);
+            rml.add_move_nodes(i, ThreadsMgr.nodes_searched() - nodes);
 
             assert(value >= -VALUE_INFINITE && value <= VALUE_INFINITE);
             assert(value < beta);
@@ -907,19 +924,19 @@ namespace {
                     for (int j = 0; j < Min(MultiPV, rml.move_count()); j++)
                     {
                         cout << "info multipv " << j + 1
-                             << " score " << value_to_uci(rml.get_move_score(j))
+                             << " score " << value_to_uci(rml.move_score(j))
                              << " depth " << (j <= i ? Iteration : Iteration - 1)
                              << " time " << current_search_time()
                              << " nodes " << ThreadsMgr.nodes_searched()
                              << " nps " << nps()
                              << " pv ";
 
-                        for (int k = 0; rml.get_move_pv(j, k) != MOVE_NONE && k < PLY_MAX; k++)
-                            cout << rml.get_move_pv(j, k) << " ";
+                        for (int k = 0; rml.move_pv(j, k) != MOVE_NONE && k < PLY_MAX; k++)
+                            cout << rml.move_pv(j, k) << " ";
 
                         cout << endl;
                     }
-                    alpha = rml.get_move_score(Min(i, MultiPV - 1));
+                    alpha = rml.move_score(Min(i, MultiPV - 1));
                 }
             } // PV move or new best move
 
@@ -959,15 +976,15 @@ namespace {
     assert(ply > 0 && ply < PLY_MAX);
     assert(pos.thread() >= 0 && pos.thread() < ThreadsMgr.active_threads());
 
-    Move movesSearched[256];
-    EvalInfo ei;
+    Move movesSearched[MOVES_MAX];
+    Value margins[2];
     StateInfo st;
     const TTEntry *tte;
     Key posKey;
     Move ttMove, move, excludedMove, threatMove;
     Depth ext, newDepth;
     Value bestValue, value, oldAlpha;
-    Value refinedValue, nullValue, futilityValueScaled; // Non-PV specific
+    Value refinedValue, nullValue, futilityBase, futilityValueScaled; // Non-PV specific
     bool isCheck, singleEvasion, singularExtensionNode, moveIsCheck, captureOrPromotion, dangerous;
     bool mateThreat = false;
     int moveCount = 0;
@@ -1020,7 +1037,7 @@ namespace {
     if (!PvNode && tte && ok_to_use_TT(tte, depth, beta, ply))
     {
         // Refresh tte entry to avoid aging
-        TT.store(posKey, tte->value(), tte->type(), tte->depth(), ttMove, tte->static_value(), tte->king_danger());
+        TT.store(posKey, tte->value(), tte->type(), tte->depth(), ttMove, tte->static_value(), tte->static_value_margin());
 
         ss->bestMove = ttMove; // Can be MOVE_NONE
         return value_from_tt(tte->value(), ply);
@@ -1036,13 +1053,13 @@ namespace {
         assert(tte->static_value() != VALUE_NONE);
 
         ss->eval = tte->static_value();
-        ei.kingDanger[pos.side_to_move()] = tte->king_danger();
+        margins[pos.side_to_move()] = tte->static_value_margin();
         refinedValue = refine_eval(tte, ss->eval, ply);
     }
     else
     {
-        refinedValue = ss->eval = evaluate(pos, ei);
-        TT.store(posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, MOVE_NONE, ss->eval, ei.kingDanger[pos.side_to_move()]);
+        refinedValue = ss->eval = evaluate(pos, margins);
+        TT.store(posKey, VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, MOVE_NONE, ss->eval, margins[pos.side_to_move()]);
     }
 
     // Save gain for the parent non-capture move
@@ -1167,6 +1184,7 @@ namespace {
     CheckInfo ci(pos);
     ss->bestMove = MOVE_NONE;
     singleEvasion = isCheck && mp.number_of_evasions() == 1;
+    futilityBase = ss->eval + margins[pos.side_to_move()];
     singularExtensionNode =   depth >= SingularExtensionDepth[PvNode]
                            && tte
                            && tte->move()
@@ -1238,7 +1256,7 @@ namespace {
           // We illogically ignore reduction condition depth >= 3*ONE_PLY for predicted depth,
           // but fixing this made program slightly weaker.
           Depth predictedDepth = newDepth - reduction<NonPV>(depth, moveCount);
-          futilityValueScaled =  ss->eval + futility_margin(predictedDepth, moveCount)
+          futilityValueScaled =  futilityBase + futility_margin(predictedDepth, moveCount)
                                + H.gain(pos.piece_on(move_from(move)), move_to(move));
 
           if (futilityValueScaled < beta)
@@ -1356,7 +1374,7 @@ namespace {
 
     ValueType vt = (bestValue <= oldAlpha ? VALUE_TYPE_UPPER : bestValue >= beta ? VALUE_TYPE_LOWER : VALUE_TYPE_EXACT);
     move = (bestValue <= oldAlpha ? MOVE_NONE : ss->bestMove);
-    TT.store(posKey, value_to_tt(bestValue, ply), vt, depth, move, ss->eval, ei.kingDanger[pos.side_to_move()]);
+    TT.store(posKey, value_to_tt(bestValue, ply), vt, depth, move, ss->eval, margins[pos.side_to_move()]);
 
     // Update killers and history only for non capture moves that fails high
     if (    bestValue >= beta
@@ -1386,7 +1404,7 @@ namespace {
     assert(ply > 0 && ply < PLY_MAX);
     assert(pos.thread() >= 0 && pos.thread() < ThreadsMgr.active_threads());
 
-    EvalInfo ei;
+    Value margins[2];
     StateInfo st;
     Move ttMove, move;
     Value bestValue, value, futilityValue, futilityBase;
@@ -1427,11 +1445,11 @@ namespace {
         {
             assert(tte->static_value() != VALUE_NONE);
 
-            ei.kingDanger[pos.side_to_move()] = tte->king_danger();
+            margins[pos.side_to_move()] = tte->static_value_margin();
             bestValue = tte->static_value();
         }
         else
-            bestValue = evaluate(pos, ei);
+            bestValue = evaluate(pos, margins);
 
         ss->eval = bestValue;
         update_gains(pos, (ss-1)->currentMove, (ss-1)->eval, ss->eval);
@@ -1440,7 +1458,7 @@ namespace {
         if (bestValue >= beta)
         {
             if (!tte)
-                TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, DEPTH_NONE, MOVE_NONE, ss->eval, ei.kingDanger[pos.side_to_move()]);
+                TT.store(pos.get_key(), value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, DEPTH_NONE, MOVE_NONE, ss->eval, margins[pos.side_to_move()]);
 
             return bestValue;
         }
@@ -1452,7 +1470,7 @@ namespace {
         deepChecks = (depth == -ONE_PLY && bestValue >= beta - PawnValueMidgame / 8);
 
         // Futility pruning parameters, not needed when in check
-        futilityBase = bestValue + FutilityMarginQS + ei.kingDanger[pos.side_to_move()];
+        futilityBase = bestValue + FutilityMarginQS + margins[pos.side_to_move()];
         enoughMaterial = pos.non_pawn_material(pos.side_to_move()) > RookValueMidgame;
     }
 
@@ -1537,7 +1555,7 @@ namespace {
     // Update transposition table
     Depth d = (depth == DEPTH_ZERO ? DEPTH_ZERO : DEPTH_ZERO - ONE_PLY);
     ValueType vt = (bestValue <= oldAlpha ? VALUE_TYPE_UPPER : bestValue >= beta ? VALUE_TYPE_LOWER : VALUE_TYPE_EXACT);
-    TT.store(pos.get_key(), value_to_tt(bestValue, ply), vt, d, ss->bestMove, ss->eval, ei.kingDanger[pos.side_to_move()]);
+    TT.store(pos.get_key(), value_to_tt(bestValue, ply), vt, d, ss->bestMove, ss->eval, margins[pos.side_to_move()]);
 
     // Update killers only for checking moves that fails high
     if (    bestValue >= beta
@@ -2227,7 +2245,7 @@ namespace {
     StateInfo st;
     TTEntry* tte;
     Position p(pos, pos.thread());
-    EvalInfo ei;
+    Value margins[2];
     Value v;
 
     for (int i = 0; pv[i] != MOVE_NONE; i++)
@@ -2235,8 +2253,8 @@ namespace {
         tte = TT.retrieve(p.get_key());
         if (!tte || tte->move() != pv[i])
         {
-            v = (p.is_check() ? VALUE_NONE : evaluate(p, ei));
-            TT.store(p.get_key(), VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, pv[i], v, ei.kingDanger[pos.side_to_move()]);
+            v = (p.is_check() ? VALUE_NONE : evaluate(p, margins));
+            TT.store(p.get_key(), VALUE_NONE, VALUE_TYPE_NONE, DEPTH_NONE, pv[i], v, margins[pos.side_to_move()]);
         }
         p.do_move(pv[i], st);
     }
@@ -2710,17 +2728,17 @@ namespace {
 
   // RootMoveList c'tor
 
-  RootMoveList::RootMoveList(Position& pos, Move searchMoves[]) : count(0) {
+  RootMoveList::RootMoveList(Position& pos, Move searchMoves[]) {
 
     SearchStack ss[PLY_MAX_PLUS_2];
-    MoveStack mlist[MaxRootMoves];
+    MoveStack mlist[MOVES_MAX];
     StateInfo st;
     bool includeAllMoves = (searchMoves[0] == MOVE_NONE);
 
     // Initialize search stack
     init_ss_array(ss, PLY_MAX_PLUS_2);
-    ss[0].currentMove = ss[0].bestMove = MOVE_NONE;
     ss[0].eval = VALUE_NONE;
+    count = 0;
 
     // Generate all legal moves
     MoveStack* last = generate_moves(pos, mlist);
@@ -2737,12 +2755,10 @@ namespace {
             continue;
 
         // Find a quick score for the move
+        moves[count].move = ss[0].currentMove = moves[count].pv[0] = cur->move;
+        moves[count].pv[1] = MOVE_NONE;
         pos.do_move(cur->move, st);
-        ss[0].currentMove = cur->move;
-        moves[count].move = cur->move;
         moves[count].score = -qsearch<PV>(pos, ss+1, -VALUE_INFINITE, VALUE_INFINITE, DEPTH_ZERO, 1);
-        moves[count].pv[0] = cur->move;
-        moves[count].pv[1] = MOVE_NONE;
         pos.undo_move(cur->move);
         count++;
     }
@@ -2769,12 +2785,6 @@ namespace {
 
   // RootMoveList simple methods definitions
 
-  void RootMoveList::set_move_nodes(int moveNum, int64_t nodes) {
-
-    moves[moveNum].nodes = nodes;
-    moves[moveNum].cumulativeNodes += nodes;
-  }
-
   void RootMoveList::set_move_pv(int moveNum, const Move pv[]) {
 
     int j;
@@ -2813,4 +2823,4 @@ namespace {
     }
   }
 
-} // namspace
+} // namespace