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M Winther wrote on 2010-11-21 UTC
WinBoard-4.5.beta.zip: In Seirawan Chess I can introduce an external piece to an empty square, which is against the rules.

Another bug: I cannot introduce an external piece to the corner square at castling.

I played a 3 game match between Fairy-Max and Zillions in Seirawan Chess (approx. 10 sec. per move). Zillions is vastly better and won by 2½-½. In game 2 and 3 Fairy-Max blundered away a piece. This must be a bug in the algorithm. Below is game 3. Notice Zillions's remarkable rook sacrifice at the end.

[Event 'Computer Chess Game']
[Site 'DELL-7B4236477D']
[Date '2010.11.21']
[Round '-']
[White 'Fairy-Max 4.8P']
[Black 'Zillions']
[Result '0-1']
[TimeControl '30/600']
[Variant 'seirawan']
[Annotator '1. +0.24']

1. c3 {+0.24/9 53} c5 2. Nf3/H {+0.28/9 17} d6 3. d4 {+0.23/9 16} cxd4 4.
Nxd4 {-0.10/8 17} f5 5. f4 {+0.01/8 14} Nf6 6. Hf3 {+0.13/7 34} e5 7. fxe5
{+0.83/10 15} dxe5 8. Hxe5 {+0.82/9 15} Ng4 9. Bg5 {+0.87/9 44} Qxg5/H 10.
Hf3 {-2.60/10 14} Qf4 11. g3 {-2.33/8 14} Qh6 12. Na3/E {-2.38/8 19} Ne3
13. Qc1 {-2.42/8 27} Nc6 14. Nac2 {-2.37/9 17} Nxc2+ 15. Nxc2 {-2.43/10 15}
Qd6 16. Hh5+ {-2.24/7 14} g6 17. Hf4 {-2.18/9 14} Ne5 18. Bg2 {-2.14/8 24}
Bg7 19. O-O {-2.03/8 28} O-O/E 20. Rd1 {-2.17/7 15} Hb6+ 21. Ne3
{-2.14/7 16} Nf3+ 22. Bxf3 {-2.27/10 21} Qxf4 23. gxf4 {-2.30/10 15} Hxe3+
24. Qxe3 {-2.27/10 16} Exe3 25. Kf2 {-2.15/9 14} Re8 26. h4 {-2.22/8 15}
Bf6 27. h5 {-2.23/8 14} gxh5 28. a3 {-2.96/8 28} h4 29. Rd6 {-2.82/9 14}
Bg7 30. a4 {-2.88/9 13} Kh8 31. Ed2 {-3.03/10 14} Bf8 32. Rd5 {-3.04/10 15}
Bh6 33. Rd4 {-2.94/10 13} h3 34. Rh1 {-2.42/10 14} Bg7 35. Rd8
{-2.38/10 14} Bf6 36. Rxe8+ {-2.25/12 14} Exe8 37. Rxh3 {-2.25/10 15} Eg7
38. e3 {-2.22/8 14} Be6 39. c4 {-2.16/8 17} Rd8 40. Ec2 {-2.30/9 15} Ec7
41. b3 {-2.31/8 15} Ec5 42. Eb4 {-2.33/8 14} a5 43. Ec2 {-3.55/10 15} Exb3
44. Bd5 {-3.56/9 15} Ed3+ 45. Kf3 {-3.55/10 15} Bxd5+ 46. cxd5
{-3.60/10 16} Exd5 47. Eg2 {-3.74/10 14} Rg8 48. Eh2 {-3.77/10 14} Rg7 49.
Ef2 {-3.82/10 15} Ec3 50. Rh5 {-3.77/10 14} Bd4 51. Ee2 {-3.76/11 14} Rg3+
52. Exg3 {-13.29/13 16} Exe3+ 53. Kf2 {-13.36/13 26} Ee4+ 54. Kg2
{-13.38/13 17} Exf4+ 55. Kh2 {-13.99/13 15} Ef2+ 56. Kg1 {-14.00/12 14}
Ee2+ 57. Kf1 {-14.59/13 15} Exg3+ 58. Ke1 {-18.00/12 17} Exh5 59. Kd2
{-79.95/13 14} Ef4 60. Kc2 {-79.95/13 13} Ef2+ 61. Kb1 {-79.96/19 9} Ed2+
62. Kc1 {-79.97/28 6} Ea2+ 63. Kd1 {-79.98/28 4} Be3 64. Ke1 {-79.99/28 5}
Ec1#
{Xboard adjudication: Checkmate} 0-1

/Mats

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