Somehow there had been some nasty bugs which killed the AI, without crashing the game. So I got no reports but you players had serious problems.

Luckily I found the problem and it should be fixed...if I'm right the long term will show.

Smaller improvement, I now rotate the chess overlay, so it has the correct colors for both directions to play. Beforehand the white queen was on a black tile, when playing in chess view.