ILLEGAL: P i3-h3 on turn 1:
There was no P on . The piece on  is a .
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For diagnostic purposes, here is the full movelist:
1. P i3-h3 
1... P_r t4-v4 
2. p a3-x3 
2... P i4-g4 
3. P_r v4-w4 
3... n b3-x2 
4. P l3-m3 
4... P_r w4-x3 
5. p a2-x3 
5... N j3-h2 
6. P_r q4-o4 
6... n c3-a2 
7. P l2-n2 
7... P_r t2-u2 
8. p d4-e4 
8... P l1-n1 
9. P_r t3-v3 
9... b b2-d4 
10. B j2-i3 
10... B_r s2-u4 
11. b c2-b3 
11... N k3-m2 
12. P_r t1-v1 
12... p a1-w1 
13. B k2-m4 
13... N_r s3-t1 
14. k b1-c2 
14... R k4-k2 
15. B_r r2-t4 
15... p a4-x4 
16. R k2-l2 
16... N_r t1-u3 
17. n a2-w3 
17... P n1-o1 
18. B_r u4-t3 
18... b b3-a2 
19. N m2-o3 
19... N_r r3-t2 
20. r b4-b1 
20... P o1-p1 
21. R_r r4-r2 
21... p x4-w4 
22. P p1-q2 
22... R_r r2-q2 
23. p w4-v3 
23... N o3-q2 
24. K_r r1-q2 
24... p v3-u2 
25. K j1-k2 
25... B_r t3-u4 
26. n w3-u4 
26... R j4-j1 
27. N_r t2-u4 
27... r c4-u4 
28. Q k1-p1 
28... K_r q2-r2 
29. R l2-l1 
29... r b1-b4 
30. N_r u3-s2 
30... n x2-v3 
31. R l1-o1 
31... R_r s4-p4 
32. p u2-t2 
32... R o1-o2 
33. K_r r2-r1 
33... q-t2 
34. q t2-s1 
34... K_r r1-s1 
35. r u4-u2 
| 35... Q p1-r3 
| 36. B_r t4-u3 
35... r u2-u4 
36. q c1-x4 
36... Q p1-r3 
37. P_r q3-p3
In case there is a bug in the code, the settings file can be edited at /play/pbm/play.php?game=Chess&settings=1&submit=Edit