ILLEGAL: P i2-i8 on turn 1:
There was no P on i2. It is an empty space.
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For diagnostic purposes, here is the full movelist:
1. P i2-i8 
1... p k15-k9 
2. P j2-j7 
2... b l16-d8 
3. _JG_.NJZ k1-i4 
3... _CBJ_est m16-k14 
4. P k2-k6 
4... p j15-j10 
5. P d2-d5 
5... n o16-n14 
6. _AS_RO f1-f7 
6... b d8-a11 
7. M j1-i3 
7... b a11-i3 
8. P h2-i3 
8... p l15-l10 
9. _CBJ_EST m1-k3 
9... n n14-m12 
10. B e1-a5 
10... _CBJ_est d16-f14 
11. _CBJ_EST d1-f3 
11... p g15-g13 
12. .DF c1-e1 
12... p h15-h12 
13. P e2-e6 
13... .df n16-n14 
14. P l2-l5 
14... _CBJ_est f14-f12 
15. N b1-d2 
15... _JG_.njz k16-j13 
16. P m2-m4 
16... m j16-l15 
17. B l1-p5 
17... p f15-f13 
18. P n2-n7 
18... n b16-c14 
19. B p5-o6 
19... b e16-g14 
20. B o6-p7 
20... b g14-n7 
21. B p7-j13 
21... a g16-j13 
22. _JG_.NJZ i4-l6 
22... a j13-i12 
23. .DF n1-m2 
23... i16-o16;p16-n16 
24. .DF e1-e3 
24... a i12-g14 
25. N d2-f1 
25... p i15-i11 
26. .DF e3-g3 
26... _CBJ_est f12-h10 
27. A g1-h3 
27... _CBJ_est h10-j8 
28. _JG_.NJZ l6-i4 
28... n c14-e13 
29. _CBJ_EST f3-h5 
29... .df c16-c14 
30. .DF m2-k2 
30... p e15-e14 
31. N o1-m2 
31... n e13-g12 
32. N m2-l4 
32... _AS_ro f16-i13 
33. N l4-j5 
33... .df c14-d13 
34. N j5-h6 
34... .df d13-e12 
35. .DF g3-g5 
35... b n7-j11 
36. N f1-e3 
36... b j11-f7 
37. P e6-f7 
37... q h16-a9 
38. Q h1-h2 
38... q a9-a5 
39. N e3-c4 
39... q a5-d5 
40. P b2-b3 
40... p d15-d13 
41. A h3-f4 
41... q d5-d12 
42. _CBJ_EST h5-i6 
42... a g14-o6 
43. .DF k2-l3 
43... a o6-n4 
44. P o2-o3 
44... a n4-o6 
45. A f4-h5 
45... _CBJ_est k14-i12 
46. R a1-d1 
46... q d12-c12 
47. R p1-m1 
47... .df n14-n12 
48. N c4-e3 
48... .df n12-n10 
49. P c2-c4 
49... p a15-a9 
50. N e3-g4 
50... .df n10-m9 
51. N g4-i5 
51... p l10-l8 
52. N i5-h7 
52... _CBJ_est j8-l10 
53. K i1-j2 
53... resign
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Chess+on+a+Really+Big+Board&settings=melons&submit=Edit