ILLEGAL: N g1-f3 on turn 2:
There was no N on g1. The piece on g1 is a R.
Go back with your browser's BACK button, reload the page, and try again.
For diagnostic purposes, here is the full movelist:
1. P f2-f4 
1... p e7-e6 
2. N g1-f3 
2... n b8-c6 
3. P e2-e4 
3... b f8-c5 
4. P c2-c3 
4... p d7-d5 
5. P d2-d4 
5... b c5-b6 
6. B h1-g1 //conversion
6... p d5-e4 
7. C e1-e4 
7... s c8-d6 
8. C e4-g3 
8... p f7-f6 
9. B f1-d3 
9... p a7-a5 
10. N f3-d2 
10... p a5-a4 
11. S d1-g7 // check
11... k g8-f8 
12. S g7-h7 // check
12... c h8-h7 
13. B d3-h7 
13... b e8-f7 
14. N d2-e4 
14... r a8-a5 
15. P f4-f5 
15... p e6-f5 
16. Q c1-h6 
16... k f8-e7 
17. Q h6-f6 
17... k e7-d7 
18. Q f6-d8 
18... k d7-d8 
19. N e4-d6 
19... resign
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Cetina+Random+Chess&settings=asymmetric&submit=Edit