ILLEGAL: c c8-d6 on turn 7:
There was no c on c8. The piece on c8 is a q.
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For diagnostic purposes, here is the full movelist:
1. P c2-c4 
1... p c7-c5 
2. DH d1-c2 
2... n a8-b6 
3. P b2-b3 
3... p f7-f6 
4. P e2-e4 
4... p e7-e6 
5. N f1-e3 
5... p d7-d5 
6. P e4-d5 
6... p e6-d5 
7. DH c2-f5 
7... c c8-d6 
8. P g2-g3 
8... p d5-c4 
9. P b3-c4 
9... a e8-c6 
10. S h1-h4 
10... c d6-f7 
11. Q c1-c2 
11... c f7-g5 
12. DH f5-f6 
12... a c6-f3 
13. C e1-f3 
13... c g5-f3 
14. S h4-f3 
14... p g7-f6 
15. A a1-f6 //Check!
15... dh f8-g7 
16. Q c2-h7 //Check!
16... R b1-a2 
17. pass 
17... q g8-h7 
18. S f3-h7 
18... 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