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« on: February 10, 2007, 12:11:40 PM »
I think the confusion here is between an under-call and an under-raise as both situations whilst similar are different.
If a player goes all-in by calling the previous bet (but cannot make the full call), then the other players carry on as if the call was a full call and a side pot generated for all players that called fully (this side pot will contain the number of chips that exceeded the under call x each fully calling player). Betting then carries on normally from that point with chips going into the side pot. For example - blinds 100 and 200 with 5 players - Position 1 calls 200, Position 2 under-calls all-in 100 - the remaining players must still call 200 (or can raise if they have not acted yet). Assuming they all call and the blinds complete and check, then the main pot will be 500 and the side pot 500.
However, if a player raises but they do not have enough chips to make the minimum raise (i.e. under-raise), then a call only needs to be whatever the raise managed to be. However if a player who has not acted yet can raise, but their raise must still be at least the minimum raise amount. Players then must call that value. Those that have already called the under-raised amount then also need to complete to stay in the hand. After that betting round completes a side pot of the excess chips from each player over the under-raise is made. If nobody re-raised after the under-raise then they just match the under-raised amount and the next round of betting goes straigght into a side pot.