Re Raising after a player is already all in.

[redcross]

That makes perfect sense! If they shove all in you think they have the other player beat for sure, you will fold protecting their hand and giving them a shot to take down the pot. It probably frustrates you too, that maybe worth it all together.

 

[samitheman99]

Obviously its because they wanna isolate the player allin , easier to win against a single player

 

[RaisingYa]

Would need to see more information but there are several reasons for this. One could be there is a side pot that the player has a chance to win, secondly to isolate the player to make it easier to win.
I also depends on the type of game, if this is a large tournament I am not generally interested in checking the player down to get him out, I am concerned with winning more chips. If this is a SNG then maybe everyone is more likely to check it down to reduce the field. I will often bet with nothing here to reduce the field therefore increasing the chance I will win.

 

[babydrago9]

Say for the sake of argument player 1 has 1000 and shoved, there is player 2 with 10000 left and player 3 with 6000 of which player 2 is to act first. If player 2 reshoves, they are representing the nuts on any board, and so player 3 will not be wanting to risk all his chips with anything except for the nuts unless its some kind of monster draw. Therefore say the pot is AK7, and player 2 has A2 or KQ, he can reshove and player 3 will only call with a set or 2 pair and so gets him off better hands