ILLEGAL: Q e1-g1 on turn 17:
There was no Q on e1. The piece on e1 is a K.
Go back with your browser's BACK button, reload the page, and try again.
For diagnostic purposes, here is the full movelist:
1. i1-h3 
1... b8-c6 
2. c2-c3 
2... e7-e6 
3. e2-e3 
3... f7-f5 
4. h1-i3 
4... c8-d6 
5. f2-f4 
5... h7-h6 
6. d1-f3 
6... c6-b8 // oops
7. b1-d3 
7... g8-i6 
8. c1-e2 
8... i6-f3 // bxb
9. g2-f3 // p x b
9... i8-g6 
10. g1-f2 
10... b8-c6 
11. e2-d4 
11... c6-b8 // oops i did it again
12. f1-i1;j1-h1 
12... h8-i6 // thanks
13. b2-b4 //hard to believe the weekend is already gone.
13... a7-a6 
14. h1-g1 
14... b8-a7 // you too
15. R g1-g6 
15... e8-g6 
16. d3-e5 
16... g6-e8 
17. Q e1-g1 
17... d8-f6 
18. e5-g6 //check
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Janus+Chess&settings=JanusChess&submit=Edit