Hi,

I configured ScidVsPC to use the Stockfish chess engine and noticed an 
issue where Stockfish would crash when asked to evaluate a position 
already in checkmate.  This issues happens frequently if Stockfish is 
running during the checkmate in N training.  Solving the puzzle results 
in a crash.

I filed a bug on the issue at 
https://bugzilla.redhat.com/show_bug.cgi?id=1325013 but the maintainer 
attributed the issue to Stockfish being asked to evaluate an invalid 
move.  Here's the engine log of an example crash:

Engine: readyok
Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8
Scid  : go infinite
[...] Engine analysis here
Scid  : stop
Scid  : isready
Engine: readyok
Engine: bestmove h6h8
Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8 moves h6h8
Scid  : go infinite
Engine: info depth 0 score mate 0
Scid  : stop
Scid  : isready
Engine: readyok
Scid  : position fen 4k3/8/4K2Q/8/8/8/8/8 w - - 3 8 moves h6h8
Scid  : go infinite
Engine: bestmove (none)
Note: Engine terminated without warning.
Note: Engine terminated without exit code: "\"$standard_error\""

Any thoughts or help would be greatly appreciated!
------------
Regards,
Alex


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