If the SB bust, is it the button which advance or the big blind ?
The button is dead for the next hand. Easiest way for you to see is for me to show you an example.
Table looks like this before player busts:
- Player 1 is button
- Player 2 is SB
- Player 3 is BB
- Player 4
- Player 5
Table after Player 2 busts:
- Dead button is moved to where player 2 sat(you can just leave it with Player 1)
- Player 3 is SB
- Player 4 is BB
- Player 5
House rules vary.
Tournaments typically us the "dead button" rule, where the blinds advance but the button stays where it is (or moves in front of the empty seat, which is the same thing). If the big blind busts, the big blind and button move forward and there is no small blind for that hand.
But for live games many casinos use a "forward moving button" rule, where the button advances regardless, the player with the button posts a small blind (as he would otherwise have been required to), the player after the button posts a big blind, and the second player after the button also posts a big blind. On the hand after that, the two players that previously posted big blinds post a small, and the next player posts a big; the third hand goes back to normal (unless things happen during those first two hands, in which case the floorman may have to improvise).
Rarely, some games may use the "jellyroll" rule, where both the buttons and the blinds move, and two players are thereby excused of one of their blinds for a round. This is only done for games where the blinds are considered insignificant to the stakes but position is valuable, such as a 1-2 no-limit game.
Finally, in all cases when the game goes from three- or more handed to heads up, the big blind is awarded to whichever player posted it least recently, and the other player is given the small blind and the button.