ILLEGAL: s g8-f6 on turn 5:
There was no s on g8. The piece on g8 is a q.
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For diagnostic purposes, here is the full movelist:
1. P e2-e4 
1... p e7-e5 
2. A c1-d3 
2... n c8-d6 
3. N b1-c3 
3... p f7-f5 
4. P e4-f5 
4... n d6-f5 
5. Q d1-g4 
5... s g8-f6 
6. Q g4-h3 
6... n f5-h6 
7. DH f1-e2 
7... c d8-f7 
8. DH e2-e3 
8... p d7-d5 
9. DH e3-c5 
9... q f8-g8 
10. DH c5-d5 
10... s f6-d5 
11. N c3-d5 
11... a b8-d7 
12. Q h3-h4 
12... p b7-b6 
13. N d5-c7 
13... dh a8-c6 
14. N c7-e8 
14... q g8-e8 
15. S e1-h7 
15... k h8-g8 
16. S h7-f7 
16... q e8-f7 
17. A d3-c4 
17... dh c6-d5 
18. Q h4-d8 
18... k g8-h7 
19. A c4-d3 
19... p g7-g6 
20. P f2-f3 
20... dh d5-d4 
21. K g1-f1 
21... dh d4-d3 
22. P c2-d3 
22... a d7-c5 
23. C a1-c1 
23... q f7-f4 
24. Q d8-c7 
24... k h7-h8 
25. C c1-c5 
25... p b6-c5 
26. Q c7-c5 
26... q f4-d2 
27. Q c5-e5 
27... k h8-h7 
28. Q e5-e2 
28... 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