+/*
+ Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
+
+ Stockfish is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Stockfish is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
#ifndef TBPROBE_H
#define TBPROBE_H
-namespace Tablebases {
+#include <ostream>
+
+#include "../search.h"
+
+namespace Stockfish::Tablebases {
+
+enum WDLScore {
+ WDLLoss = -2, // Loss
+ WDLBlessedLoss = -1, // Loss, but draw under 50-move rule
+ WDLDraw = 0, // Draw
+ WDLCursedWin = 1, // Win, but draw under 50-move rule
+ WDLWin = 2, // Win
+
+ WDLScoreNone = -1000
+};
-extern int TBLargest;
+// Possible states after a probing operation
+enum ProbeState {
+ FAIL = 0, // Probe failed (missing file table)
+ OK = 1, // Probe succesful
+ CHANGE_STM = -1, // DTZ should check the other side
+ ZEROING_BEST_MOVE = 2 // Best move zeroes DTZ (capture or pawn move)
+};
-void init(const std::string& path);
-int probe_wdl(Position& pos, int *success);
-int probe_dtz(Position& pos, int *success);
-bool root_probe(Position& pos, Value& TBScore);
-bool root_probe_wdl(Position& pos, Value& TBScore);
+extern int MaxCardinality;
+void init(const std::string& paths);
+WDLScore probe_wdl(Position& pos, ProbeState* result);
+int probe_dtz(Position& pos, ProbeState* result);
+bool root_probe(Position& pos, Search::RootMoves& rootMoves);
+bool root_probe_wdl(Position& pos, Search::RootMoves& rootMoves);
+void rank_root_moves(Position& pos, Search::RootMoves& rootMoves);
+
+inline std::ostream& operator<<(std::ostream& os, const WDLScore v) {
+
+ os << (v == WDLLoss ? "Loss" :
+ v == WDLBlessedLoss ? "Blessed loss" :
+ v == WDLDraw ? "Draw" :
+ v == WDLCursedWin ? "Cursed win" :
+ v == WDLWin ? "Win" : "None");
+
+ return os;
+}
+
+inline std::ostream& operator<<(std::ostream& os, const ProbeState v) {
+
+ os << (v == FAIL ? "Failed" :
+ v == OK ? "Success" :
+ v == CHANGE_STM ? "Probed opponent side" :
+ v == ZEROING_BEST_MOVE ? "Best move zeroes DTZ" : "None");
+
+ return os;
}
+} // namespace Stockfish::Tablebases
+
#endif