[gnugo-devel] Illegal move

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I got an illegal move running:

twogtp --black "gnugo --quiet --mode gtp" --white "gnugo --quiet \
--experimental-semeai --mode gtp" --games 500 --sgffile semeai_d_.sgf.

After 86 games, I got

GTP error on executing black Q2:
 ? illegal move at ./twogtp line 52, <GEN5> line 40247.

Unfortunately though twogtp closes the sgf file in the case
of a crash, in the case of an illegal move it does not (yet!)
so I do not have an sgf file of the game in question.

Dan