[yoursmine]

Ok
Please settle this one for us

Tournament poker...blinds are 400-800
The Big blind who has 1200 left announces he is allin before the cards are even dealt...allin blind so to speak. Other players tell him he cannot do this and must wait until the action gets to him.

Roberts rules say that once you post the big blind that is your bet for that round and you are not allowed to raise until its your turn to act.

One of our players is insisting since the rules dont specifically address this situation its unclear.

My thinking is this....

Before you are dealt cards everyone must either bet or not. In NL holdem only the two blinds have to post a bet (SB and BB) Everyone else does not have to post a bet pre-deal. Once the cards are dealt UTG has the right of opening the betting for the pre-flop round
Once it gets back to the BB he can do whatever he likes.
The only problem with this logic is that other players not in the blinds "pre-deal" are allowed to go allin blind.

Is there any further clarification on this rule anywhere?
Thanks