Not sure if it isn't already fixed. Here is the game:

[Event "Chessmaster: Grandmaster Edition Rated Game"]
[Site ""]
[Date "2008.7.3"]
[Round ""]
[White "Alex Crivat"]
[Black "Berry"]
[TimeControl "600"]
[Result "0-1"]
[ECO " "]

1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nf3 Bd7 5.Nc3 Qa5 6.Bd2 Bg4 7.Ne4 Qc7 8.Nc5 Qb6 9.Bd3 Bxf3 10.Qxf3 Qxb2 11.O-O e6 12.Rfd1 Qxd4 13.Nb3
Qxe5 14.Bf4 Qc3 15.Rdc1 Nd7 16.Bd2 Qe5 17.Qe3 Qxe3 18.Bxe3 h5 19.Rab1 Ngf6 20.Nd4 Ne5 21.Rxb7 Nfg4 22.Bf4 Nd7 23.Nxc6 Bc5 24.Bg3
h4 25.Bf4 Nxf2 26.Kf1 h3 27.g3 Ng4 28.Rcb1 g5 29.Nb8 gxf4 30.gxf4 Bd4 31.Nxd7 O-O-O 32.Rb8+ Kxd7 33.Rxd8+ Kxd8 34.f5 a5 35.fxe6
Nxh2+ 36.Ke2 fxe6 37.c3 Be5 38.c4 Kc7 39.cxd5 Rh4 40.dxe6 Rh6 41.Bc4 Ng4 42.Bd5 h2 43.Rb7+ Kc8 44.e7 Nf6 45.Rb6 Kd7 46.Rb7+ Kd6
47.Bf3 Ke6 48.Kd3 Rh3 49.Ke2 Rxf3 50.Kxf3 h1=Q+ 0-1

On move 31 black castles on the queen side althow the B8 cell was guarded by the rock at B7 and the knigth at D7. As far as my chess knowledge goes that's an illegal move right ?
My problem is that I could not find anywere on ubisoft's site a link to submit such problems so I'm posting here.

Thanks,
Alex

Everything is fine. The rook can be attacked and can pass the attacked square. The king can't.

http://en.wikipedia.org/wiki/Castling

Correct ! Never knew that rule. Thanks ! I've learned something new