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surely even with AA against 3 other people the odds are not good....Peter

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Define "not good".

Against 3 other reasonable all-in hands you are usually around 55% to quadruple up with AA.

In the rare case that someone else also has AA, you are about 60% to split, or double up with your AA.

If you pass up a 55% chance to quadruple up, you shouldn't play poker...