ILLEGAL: a e8-d6 on turn 1:
There was no a on e8. The piece on e8 is a dh.
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For diagnostic purposes, here is the full movelist:
1. P g2-g4 
1... a e8-d6 
2. P e2-e3 
2... p f7-f5 
3. P g4-g5 
3... p e7-e5 
4. N b1-c3 
4... p c7-c6 
5. P e3-e4 
5... p f5-f4 
6. A h1-f3 
6... q f8-e7 
7. C e1-g2 
7... p g7-g6 
8. P a2-a3 
8... c h8-f7 
9. P b2-b4 
9... s c8-b6 
10. R c1-b1 
10... q e7-e6 
11. P d2-d3 
11... a d6-c8 
12. P a3-a4 
12... p d7-d5 
13. P a4-a5 
13... s b6-d7 
14. P e4-d5 
14... p c6-d5 
15. N c3-a4 
15... p e5-e4 
16. A f3-d4 
16... q e6-a6 
17. P d3-e4 
17... p b7-b6 
18. DH f1-a6 
18... a c8-a6 
19. P a5-b6 
19... p a7-b6 
20. A d4-c6 //Check!
20... a a6-b7 
21. P b4-b5 
21... a b7-c6 
22. P b5-c6 
22... s d7-e5 
23. P f2-f3 
23... s e5-c6 
24. P e4-d5 
24... s c6-d6 
25. N a4-c3 
25... c f7-e5 
26. C g2-f4 
26... dh d8-g5 
27. C f4-a4 //Check!
27... k a8-b7 
28. Q g1-b6 //Check!
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