If you send "offer draw" if the position is draw by rule, WinBoard immediately grants the draw. There is no reason to wait for a move. In two-machines mode, it would also be safe to send "1/2-1/2 { draw by rule }" here, and exit, as there is no way the game will ever continue.
If you send "offer draw" in a position that is not draw by rule, because you want to claim a draw that will occur only after the move, WinBoard can wait for your move without doing anything with the draw offer. If you don't send a move, you forfeit on time. The offer is not accepted as a claim if you don't tell first which move is the basis for your claim. The move is an essential part of the draw claim.
Looks simple enough to me...
Engine authors, beware of false-draw-claim forfeits!
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