+ if (TB::Cardinality >= RootPos.count<ALL_PIECES>(WHITE)
+ + RootPos.count<ALL_PIECES>(BLACK))
+ {
+ // If the current root position is in the tablebases then RootMoves
+ // contains only moves that preserve the draw or win.
+ TB::RootInTB = Tablebases::root_probe(RootPos, RootMoves, TB::Score);
+
+ if (TB::RootInTB)
+ TB::Cardinality = 0; // Do not probe tablebases during the search
+
+ else // If DTZ tables are missing, use WDL tables as a fallback
+ {
+ // Filter out moves that do not preserve a draw or win
+ TB::RootInTB = Tablebases::root_probe_wdl(RootPos, RootMoves, TB::Score);
+
+ // Only probe during search if winning
+ if (TB::Score <= VALUE_DRAW)
+ TB::Cardinality = 0;
+ }
+
+ if (TB::RootInTB)
+ {
+ TB::Hits = RootMoves.size();
+
+ if (!TB::UseRule50)
+ TB::Score = TB::Score > VALUE_DRAW ? VALUE_MATE - MAX_PLY - 1
+ : TB::Score < VALUE_DRAW ? -VALUE_MATE + MAX_PLY + 1
+ : VALUE_DRAW;
+ }
+ }
+
+ for (Thread* th : Threads)
+ {
+ th->maxPly = 0;
+ th->notify_one(); // Wake up all the threads
+ }