http://bugs.winehq.org/show_bug.cgi?id=31113
--- Comment #65 from Benj benj.callaghan@gmail.com 2013-04-14 08:46:48 CDT --- I opened one of my crashing saves (small map) on Windows and I could play past the broken turn. Opening the same save afterwards in Linux also worked. Playing a new game (duel map) has not crashed yet at turn 200.
Not sure if this is related but I could not even run the game until I reinstalled Steam and copied in the steamapps folder. I also had to validate my local files. I have heard that this usually fixes this bug on Windows.