ILLEGAL: N e1-f3 on turn 2:
There was no N on e1. The piece on e1 is a B.
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For diagnostic purposes, here is the full movelist:
1. P b2-b4 
1... b7-b5 
2. N e1-f3 
2... c8-b7 
3. P e2-e3 
3... f8-e6 
4. P h2-h4 
4... e8-f6 
5. P d2-d3 
5... h8-f8 
6. N f1-g3 
6... resign
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Fischer+Random+Chess&settings=FRC01&submit=Edit