PFR: Pre-Flop RaisePFR is the percentage of a player's hands where they made at least one raise pre-flop, given an opportunity to do so. It's one of the most fundamental statistics that helps you estimate a player's range, especially when you take position into account. For example, if their PFR is 16% from the Hijack, you can infer that they're often raising hands like:    
but probably not hands like:    
per_hand: true
opportunity: round == P
instance: action == Raise
split position
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