ILLEGAL: dh g8-e6 on turn 4:
There was no dh on g8. The piece on g8 is a c.
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For diagnostic purposes, here is the full movelist:
1. P f2-f4 
1... p f7-f5 
2. A d1-e3 
2... p c7-c5 
3. A e3-f5 
3... p g7-g6 
4. A f5-g4 
4... dh g8-e6 
5. A g4-h6;won //Checkmate!
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Cetran+Chess+2&settings=asymmetric&submit=Edit