ILLEGAL: m d9-e7 on turn 2:
There was no m on d9. The piece on d9 is a q.
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For diagnostic purposes, here is the full movelist:
1. P c2-c4 
1... p c8-c6 
2. P b2-b4 
2... m d9-e7 
3. P a2-a3 
3... p b8-b7 
4. M d1-b3 
4... p f8-f6 
5. P f2-f3 
5... n e9-f7 
6. Q g1-f2 
6... q g9-f8 
7. M b3-c2 
7... p f6-f5 
8. P g2-g4 
8... p f5-g4 
9. N f1-g3 
9... q f8-h6 
10. P f3-g4 
10... b b9-g4 
11. M c2-e3 
11... q h6-h4 
12. N e1-g2 
12... b a9-g3 
13. Q f2-g3 
13... q h4-g3 
14. P h2-g3 
14... b g4-e2 
15. N g2-f4 
15... m e7-i3 
16. resign
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Pseudo-Modern+Random+Chess&settings=P-MRC&submit=Edit