In case we have installed a not complete set of 6-men tables and
there is 6 piece position on board, but no corresponding
tablebase engine is not using any syzygy at all.
Reported by Jouni Uski, fix by Peter Ă–sterlund,
confirmed as a bug by Ronald de Man.
bench:
7591630
RootInTB = root_probe_wdl(pos, rootMoves, TB::Score);
// Only probe during search if winning
- if (TB::Score <= VALUE_DRAW)
+ if (RootInTB && TB::Score <= VALUE_DRAW)
Cardinality = 0;
}