Position — where you act relative to the button — is the single biggest driver of preflop range width. Acting later means more information: everyone who acted before you has already revealed whether they're in the pot, and for how much. Open from UTG and eight players are still left to wake up with a big hand behind you; open from the button and only the two blinds get a say.

That's why raise-first-in ranges widen monotonically from UTG to the button in a full 9-max lineup: less risk of running into a stronger range means more speculative hands (suited connectors, weaker aces, offsuit broadways) become profitable opens. The blinds are a special case — the small blind opens the pot facing only the big blind, so it plays wide too, while the big blind never opens at all (it's always closing the action, either folding, calling, or 3-betting someone else's raise).

Position also compounds postflop: acting last on every remaining street means you see your opponent's decision before making your own, which is worth real equity independent of your cards. This is why the same hand — say, K♦9♦ — can be a clear fold from UTG and a clear open from the button: the hand hasn't changed, but the amount of information and the size of the range it's up against has.

Click a seat below to pull up its actual raise-first-in range and combo-weighted opening percentage, computed live from the same data the Trainer grades against.