ILLEGAL: P f2-f8 on turn 1:
There was no P on f2. It is an empty space.
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For diagnostic purposes, here is the full movelist:
1. P f2-f8 
1... p f15-f9 
2. _AS_RO f1-f5 
2... p g15-g10 
3. P h2-h8 
3... p k15-k9 
4. P k2-k8 
4... _JG_.njz k16-i13 
5. P g2-g7 
5... b e16-m8 
6. P m2-m6 
6... a g16-a10 
7. P b2-b9 
7... a a10-c9 
8. B e1-m9 
8... p j15-j12 
9. Q h1-c6 
9... a c9-b8 
10. Q c6-d6 
10... a b8-d6 
11. _AS_RO f5-d6 
11... _JG_.njz i13-j11 
12. P l2-l7 
12... b l16-c7 
13. P e2-e5 
13... b c7-d6 
14. P e5-d6 
14... b m8-o6 
15. M j1-i3 
15... _JG_.njz j11-m9 
16. P p2-p5 
16... b o6-k10 
17. _JG_.NJZ k1-l4 
17... q h16-e13 
18. A g1-a7 
18... p h15-h14 
19. P d2-d4 
19... _AS_ro f16-f10 
20. _JG_.NJZ l4-m7 
20... .df c16-c14 
21. R p1-p4 
21... _CBJ_est d16-b14 
22. N b1-c3 
22... p d15-d9 
23. R p4-e4 
23... q e13-c13 
24. R e4-e10 
24... _AS_ro f10-f4 
25. K i1-j1 
25... .df c14-d15 
26. R a1-b1 
26... n b16-c14 
27. _CBJ_EST d1-f3 
27... _AS_ro f4-g6 
28. B l1-g6 
28... b k10-g6 
29. _CBJ_EST f3-e4 
29... q c13-c12 
30. R e10-g10 
30... _JG_.njz m9-j11 
31. R g10-i10 
31... i16-b16;a16-c16 
32. _CBJ_EST e4-g6 
32... p i15-i11 
33. M i3-j3 
33... _JG_.njz j11-h8 
34. A a7-e11 
34... _JG_.njz h8-f11 
35. A e11-c12 
35... _JG_.njz f11-c12 
36. M j3-h3 
36... _JG_.njz c12-f11 
37. R i10-f10 
37... _JG_.njz f11-h9 
38. _JG_.njz h9-f11 
38... _JG_.njz f11-i9 
39. R f10-d10 
39... r c16-d16 
40. _CBJ_EST g6-i8 
40... _JG_.njz i9-f7 
41. _CBJ_EST i8-h8 
41... _JG_.njz f7-d10 
42. _CBJ_EST h8-f10 
42... m j16-g16 
43. _JG_.NJZ m7-j9 
43... _CBJ_est m16-k14 
44. M h3-h12 
44... p i11-i10 
45. M h12-i10 
45... _JG_.njz d10-f7 
46. P i2-i3 
46... n o16-n14 
47. N c3-b5 
47... p o15-o9 
48. .DF c1-c3 
48... _JG_.njz f7-e4 
49. _JG_.NJZ j9-h12 
49... r d16-c16 
50. _CBJ_EST f10-f11 
50... p e15-e14 
51. _CBJ_EST f11-e12 
51... m g16-g7 
52. M i10-i4 
52... _JG_.njz e4-h3 
53. _CBJ_EST e12-c14 
53... .df d15-c14 
54. R b1-h1 
54... _JG_.njz h3-f2 
55. M i4-h2 
55... _JG_.njz f2-e4 
56. M h2-i4 
56... _JG_.njz e4-b5 
57. _JG_.NJZ h12-e13 
57... _JG_.njz b5-c3 
58. R h1-h14 
58... _JG_.njz c3-f2 
59. M i4-i14 
59... m g7-k7 
60. _CBJ_EST m1-k3 
60... p m15-m9 
61. _CBJ_EST k3-j3 
61... .df n16-m15 
62. R h14-e14 
62... .df c14-e14 
63. M i14-e14 
63... _JG_.njz f2-g5 
64. _JG_.NJZ e13-d15 
64... resign // - sxg has resigned. -
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