ILLEGAL: a d8-f7 on turn 4:
There was no a on d8. The piece on d8 is a dh.
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For diagnostic purposes, here is the full movelist:
1. P d2-d3 
1... p e7-e5 
2. C b1-c3 
2... p g7-g6 
3. P f2-f3 
3... p f7-f6 
4. N f1-e3 
4... a d8-f7 
5. P h2-h4 
5... p h7-h5 
6. A c1-b3 
6... a f7-e6 
7. P g2-g4 
7... c e8-g7 
8. P g4-h5 
8... c g7-h5 
9. N e3-g2 
9... p b7-b6 
10. DH g1-h2 
10... dh h8-h7 
11. P e2-e4 
11... dh h7-h6 
12. Q h1-g1 
12... p c7-c6 
13. C c3-e2 
13... k c8-c7 
14. P d3-d4 
14... r b8-d8 
15. P d4-e5 
15... a e6-b3 
16. P e5-f6 
16... k c7-c8 
17. P a2-b3 
17... n g8-f6 
18. Q g1-b6 
18... c h5-b5 
19. Q b6-a6 
19... q a8-b7 
20. Q a6-b7 
20... c b5-b7 
21. S e1-b7 
21... k c8-b7 
22. N g2-e3 
22... dh h6-h5 
23. DH h2-g3 
23... p d7-d5 
24. P e4-e5 
24... n f6-d7 
25. N e3-g4 
25... dh h5-h4 
26. DH g3-h4 
26... s f8-h4 
27. P e5-e6 
27... n d7-c5 
28. P e6-e7 
28... r d8-c8 
29. P e7-e8; Q-e8 
29... r c8-e8 
30. C e2-e8 
30... s h4-f3 
31. C e8-e7 
31... k b7-b6 
32. R a1-a7 
32... s f3-d4 //Check!
33. K d1-d2 
33... s d4-g4 
34. C e7-c8 
34... k b6-b5 
35. C c8-c7 
35... k b5-b6 
36. C c7-a8 
36... k b6-b5 
37. C a8-b8 
37... n c5-b7 
38. C b8-b7 
38... 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