[Zetack]

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guys, in a MTT, would a guy who is playing on 2 computers on 2 separate connections have that much advantage? why?

what would someone who is playing 2 accounts at the same table be at such an advantage?

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In a MTT most of the time having more than one account playing is not a direct advantage. However, if its a big tourney with a limited number of opportunities to play, say the Sunday Million, if you are a +EV player and can put yourself in it six times, then effectively, you get to play this tourney 312 times a year, while other players who abide by the rules only get to play it 52 times a year. And that's not fair.
Some people also feal that other players are being cheated by having five more plus EV players in the tourney, than if hte guy could only enter once. I think this effect is too negligible to count for anything, and in anycase you don't have any bankable expectation of a certain ratio of good to bad players.

Also there is some, albeit very small, chance that two of your accounts may end up on the same table.

If you have two accounts on the same table there are a number of advantages. First, poker being a game of incomplete information, any time you gain information that other players do not have it can be a big advantage. You know two extra cards that may affect the odds for example. You may know that one of the cards to a draw you are scared of, are gone, or that one of your outs is gone, or that the hand a person is representing with a big bet is not possible. It may present you with extra bluffing possibilities. Suppose there's a four flush on the board and your other account folded the ace of that suit. You can make a very strong bluff bet or raise.

More sophisticted uses of the two accounts involve minipulating your opponent. For instance, a player is more likely to fold to a raise and a reraise, than a single raise. If one of your hands has a big hand and the other does not, you can use the two account to manipulate the other player into putting more money in the pot, say by having one account bet a moderate amount, player in-between calls, then your monster raises a moderate amount, and now the in-between player, who might not have called the total raise, calls the raise made in steps like that.

These are just some examples. Having two accounts at a table is not a guarantee that a player will do well, but it is a big advantage.