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You must bet the minimum of the big blind and when raising, you must at least double the amount of the bet (or raise) of the previous better.
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As has been pointed out by others, this is wrong.
Not every poker site implements the standard rules of poker. I believe this is one of the rules that Absolute Poker implements incorrectly (in addition to awarding pots to the wrong players in Razz). If the big blind is $1, and someone raises to $5, that is a raise of $4, and the smallest possible reraise should be to $9. However, I believe Absolute Poker incorrectly makes the smallest possible raise one to $10.
This isn't very important in normal play, since reraises postflop with are less than all-in are rare, and minimum reraises preflop are usually bad plays. However, this came up while I was analyzing hands from the recent cheating scandal on Absolute Poker. I looked at the bet sizes chosen by Potripper in the tournament where Potripper could see the other players' hole cards. In several situations, Potripper would make the smallest possible raise for value when his opponents were weak.
Hand 8
Board: T[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img]
Opponent (out of position): 9[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]
Potripper (in position): A[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/diamond.gif[/img]
Pot: 960
Oppt checks, PR bets 399, Oppt raises to 1068, PR reraises to 2136, Oppt folds.
Potripper raised 1068 more instead of 669 more against an opponent he know was weak, but on Absolute Poker, that was the smallest allowed reraise.
There have been several televised reraises (postflop) to an amount less than twice the size of the raise. Here is an
example in a blind versus blind battle from season 3 of
High Stakes Poker:
Board: 9[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img]
Benyamine (out of position): J[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/diamond.gif[/img]
Esfandiari (in position): 4[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img]
Pot: $13,400
B bet $18k, E raised $24k to $42k, B reraised $30k to $72k, E reraised $40k to $112k, B called.
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Other than those two restrictions, you can bet any or all your chips at any time.
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Actually, that's wrong, too, even if you mean when it is your turn. If you bet or call a bet, and then someone raises all-in for a small amount, this does not give you the ability to reraise under normal poker rules. Your options are only to call the extra amount or to fold (unless someone else made a raise), although someone who had not yet called the initial bet would be able to raise.
For example, suppose player A bets $10, player B raises to $11, all-in, and players C calls $11 (raising was an option for C). Player A can call $1 or fold, but should not be able to reraise. This rule is also not implemented properly on some poker sites, and it is important to recognize whether you are vulnerable to a reraise or not if you are in C's position.