ILLEGAL: c f8-e6 on turn 4:
There was no c on f8. The piece on f8 is a r.
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For diagnostic purposes, here is the full movelist:
1. P d2-d4 
1... p b7-b6 
2. A e1-d3 
2... p f7-f5 
3. P b2-b3 
3... a c8-a6 
4. P f2-f3 
4... c f8-e6 
5. A d3-f5 
5... c e6-f8 
6. A f5-e7 
6... resign
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