Position RootPosition;
}
+using std::string;
using std::cout;
using std::endl;
-using std::string;
using namespace Search;
namespace {
TimeManager TimeMgr;
int BestMoveChanges;
int SkillLevel;
- bool SkillLevelEnabled;
+ bool SkillLevelEnabled, Chess960;
History H;
/// Local functions
- void id_loop(Position& pos);
-
template <NodeType NT>
Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth);
template <NodeType NT>
Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth);
+ void id_loop(Position& pos);
bool check_is_dangerous(Position &pos, Move move, Value futilityBase, Value beta, Value *bValue);
bool connected_moves(const Position& pos, Move m1, Move m2);
Value value_to_tt(Value v, int ply);
bool can_return_tt(const TTEntry* tte, Depth depth, Value beta, int ply);
bool connected_threat(const Position& pos, Move m, Move threat);
Value refine_eval(const TTEntry* tte, Value defaultEval, int ply);
- void update_history(const Position& pos, Move move, Depth depth, Move movesSearched[], int moveCount);
Move do_skill_level();
int elapsed_time(bool reset = false);
string score_to_uci(Value v, Value alpha = -VALUE_INFINITE, Value beta = VALUE_INFINITE);
MovePicker* mp;
};
- // Overload operator<<() to make it easier to print moves in a coordinate
- // notation compatible with UCI protocol.
- std::ostream& operator<<(std::ostream& os, Move m) {
-
- bool chess960 = (os.iword(0) != 0); // See set960()
- return os << move_to_uci(m, chess960);
- }
-
- // 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 read it to properly format castling moves.
- enum set960 {};
-
- std::ostream& operator<<(std::ostream& os, const set960& f) {
-
- os.iword(0) = f;
- return os;
- }
-
// is_dangerous() checks whether a move belongs to some classes of known
// 'dangerous' moves so that we avoid to prune it.
FORCE_INLINE bool is_dangerous(const Position& pos, Move m, bool captureOrPromotion) {
static Book book; // Defined static to initialize the PRNG only once
Position& pos = RootPosition;
+ Chess960 = pos.is_chess960();
elapsed_time(true);
TimeMgr.init(Limits, pos.startpos_ply_counter());
TT.new_search();
// is given, with the subset of legal moves to search.
for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
if ( SearchMoves.empty()
- || std::count(SearchMoves.begin(), SearchMoves.end(), ml.move()))
+ || count(SearchMoves.begin(), SearchMoves.end(), ml.move()))
RootMoves.push_back(RootMove(ml.move()));
- // Set output stream mode: normal or chess960. Castling notation is different
- cout << set960(pos.is_chess960());
-
if (Options["OwnBook"].value<bool>())
{
if (Options["Book File"].value<string>() != book.name())
book.open(Options["Book File"].value<string>());
Move bookMove = book.probe(pos, Options["Best Book Move"].value<bool>());
- if (bookMove != MOVE_NONE)
- {
- if (!Signals.stop && (Limits.ponder || Limits.infinite))
- Threads.wait_for_stop_or_ponderhit();
- cout << "bestmove " << bookMove << endl;
- return;
+ if ( bookMove != MOVE_NONE
+ && count(RootMoves.begin(), RootMoves.end(), bookMove))
+ {
+ std::swap(RootMoves[0], *find(RootMoves.begin(), RootMoves.end(), bookMove));
+ goto finish;
}
}
pos.undo_move(RootMoves[0].pv[0]);
}
+finish:
+
// When we reach max depth we arrive here even without a StopRequest, but if
// we are pondering or in infinite search, we shouldn't print the best move
// before we are told to do so.
if (!Signals.stop && (Limits.ponder || Limits.infinite))
Threads.wait_for_stop_or_ponderhit();
- // Could be MOVE_NONE when searching on a stalemate position
- cout << "bestmove " << RootMoves[0].pv[0];
-
- // UCI protol is not clear on allowing sending an empty ponder move, instead
- // it is clear that ponder move is optional. So skip it if empty.
- if (RootMoves[0].pv[1] != MOVE_NONE)
- cout << " ponder " << RootMoves[0].pv[1];
-
- cout << endl;
+ // Best move could be MOVE_NONE when searching on a stalemate position
+ cout << "bestmove " << move_to_uci(RootMoves[0].pv[0], Chess960)
+ << " ponder " << move_to_uci(RootMoves[0].pv[1], Chess960) << endl;
}
// If search has been stopped exit the aspiration window loop.
// Sorting and writing PV back to TT is safe becuase RootMoves
- // is still valid, although refers to previous iteration.
+ // is still valid, although refers to previous iteration.
if (Signals.stop)
break;
if (skillBest == MOVE_NONE) // Still unassigned ?
skillBest = do_skill_level();
- std::swap(RootMoves[0], *std::find(RootMoves.begin(), RootMoves.end(), skillBest));
+ std::swap(RootMoves[0], *find(RootMoves.begin(), RootMoves.end(), skillBest));
}
}
// At root obey the "searchmoves" option and skip moves not listed in Root
// Move List, as a consequence any illegal move is also skipped. In MultiPV
// mode we also skip PV moves which have been already searched.
- if (RootNode && !std::count(RootMoves.begin() + PVIdx, RootMoves.end(), move))
+ if (RootNode && !count(RootMoves.begin() + PVIdx, RootMoves.end(), move))
continue;
// At PV and SpNode nodes we want all moves to be legal since the beginning
if (RootNode)
{
- // This is used by time management
Signals.firstRootMove = (moveCount == 1);
-
nodes = pos.nodes_searched();
if (pos.thread() == 0 && elapsed_time() > 2000)
cout << "info depth " << depth / ONE_PLY
- << " currmove " << move
+ << " currmove " << move_to_uci(move, Chess960)
<< " currmovenumber " << moveCount + PVIdx << endl;
}
// be trusted, and we don't update the best move and/or PV.
if (RootNode && !Signals.stop)
{
- RootMove& rm = *std::find(RootMoves.begin(), RootMoves.end(), move);
+ RootMove& rm = *find(RootMoves.begin(), RootMoves.end(), move);
rm.nodes += pos.nodes_searched() - nodes;
// PV move or new best move ?
}
// Step 21. Update tables
- // Update transposition table entry, history and killers
+ // Update transposition table entry, killers and history
if (!SpNode && !Signals.stop && !thread.cutoff_occurred())
{
move = bestValue <= oldAlpha ? MOVE_NONE : ss->bestMove;
TT.store(posKey, value_to_tt(bestValue, ss->ply), vt, depth, move, ss->eval, ss->evalMargin);
- // Update killers and history only for non capture moves that fails high
+ // Update killers and history for non capture cut-off moves
if ( bestValue >= beta
- && !pos.is_capture_or_promotion(move))
+ && !pos.is_capture_or_promotion(move)
+ && !inCheck)
{
if (move != ss->killers[0])
{
ss->killers[1] = ss->killers[0];
ss->killers[0] = move;
}
- update_history(pos, move, depth, movesSearched, playedMoveCount);
+
+ // Increase history value of the cut-off move
+ Value bonus = Value(int(depth) * int(depth));
+ H.add(pos.piece_on(move_from(move)), move_to(move), bonus);
+
+ // Decrease history of all the other played non-capture moves
+ for (int i = 0; i < playedMoveCount - 1; i++)
+ {
+ Move m = movesSearched[i];
+ H.add(pos.piece_on(move_from(m)), move_to(m), -bonus);
+ }
}
}
// value_to_tt() adjusts a mate score from "plies to mate from the root" to
- // "plies to mate from the current ply". Non-mate scores are unchanged.
- // The function is called before storing a value to the transposition table.
+ // "plies to mate from the current ply". Non-mate scores are unchanged. The
+ // function is called before storing a value to the transposition table.
Value value_to_tt(Value v, int ply) {
}
- // update_history() registers a good move that produced a beta-cutoff in
- // history and marks as failures all the other moves of that ply.
-
- void update_history(const Position& pos, Move move, Depth depth,
- Move movesSearched[], int moveCount) {
- Move m;
- Value bonus = Value(int(depth) * int(depth));
-
- H.update(pos.piece_on(move_from(move)), move_to(move), bonus);
-
- for (int i = 0; i < moveCount - 1; i++)
- {
- m = movesSearched[i];
-
- assert(m != move);
-
- H.update(pos.piece_on(move_from(m)), move_to(m), -bonus);
- }
- }
-
-
// current_search_time() returns the number of milliseconds which have passed
// since the beginning of the current search.
continue;
int d = (updated ? depth : depth - 1);
- Value s = (updated ? RootMoves[i].score : RootMoves[i].prevScore);
+ Value v = (updated ? RootMoves[i].score : RootMoves[i].prevScore);
+ std::stringstream s;
- cout << "info"
- << " depth " << d
+ for (int j = 0; RootMoves[i].pv[j] != MOVE_NONE; j++)
+ s << " " << move_to_uci(RootMoves[i].pv[j], Chess960);
+
+ cout << "info depth " << d
<< " seldepth " << selDepth
- << (i == PVIdx ? score_to_uci(s, alpha, beta) : score_to_uci(s))
+ << (i == PVIdx ? score_to_uci(v, alpha, beta) : score_to_uci(v))
<< " nodes " << pos.nodes_searched()
<< " nps " << (t > 0 ? pos.nodes_searched() * 1000 / t : 0)
<< " time " << t
- << " multipv " << i + 1 << " pv";
-
- for (int j = 0; RootMoves[i].pv[j] != MOVE_NONE; j++)
- cout << " " << RootMoves[i].pv[j];
-
- cout << endl;
+ << " multipv " << i + 1
+ << " pv" << s.str() << endl;
}
}
size_t length;
std::stringstream s;
- s << set960(pos.is_chess960())
- << std::setw(2) << depth
+ s << std::setw(2) << depth
<< std::setw(8) << score_to_string(value)
<< std::setw(8) << time_to_string(time);
for (int i = abs(get_system_time() % 50); i > 0; i--)
rk.rand<unsigned>();
- // Rml list is already sorted by score in descending order
+ // RootMoves are already sorted by score in descending order
size_t size = std::min(MultiPV, RootMoves.size());
int variance = std::min(RootMoves[0].score - RootMoves[size - 1].score, PawnValueMidgame);
int weakness = 120 - 2 * SkillLevel;
projects / stockfish / blobdiff