yeah black is always at the bottom, there have been suggestions to change this but its not a priority since you could always use the admincp options to flip the colours. (set black to white and white to black)
As for the illegal moves, yes it does allow for them if your opponant makes an illegal move you can take it back in your turn by making the reverse of their move eg they moved a knight (a4,a5) you can reverse it by doing (a5,a4)
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