Decision based on your ROI

[GrekeHaus]

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Why would your ROI ever come into any decision that you would make?

Also I doubt how +EV calling with AKs is in the scenario you described.

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One of the key things that seperates tournament poker from ring games is this exact idea. The fact that you can't reload if you go broke plays a significant role in decision making. In tournament poker, you will often find yourself passing on +EV situations for the reason that you will have bigger +EV situations later in the game.