The Replayer marks some hands with the special markers, which indicate the type of the preflop situation before the hero, and tells you that they can be quickly analyzed in the preflop calculator ICMIZER using Nash equilibrium ranges:

O - two all-ins before hero, hero can OVERCALL

C - one all-in before hero, hero can CALL all-in

P - all folded to hero, hero can open PUSH

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