We must continue with middle pair on the turn; folding with over 50% equity against the opponent's range is a significant mistake.
Flop Analysis
Facing a donk bet on this texture, we have a mandatory call with top pair. We are in position and our hand is too strong to fold, but raising would likely isolate us against better hands.
**Ranges:** The Big Blind's leading range often consists of middling pairs (Tx, 7x) or straight draws (J9, 98, KJ) that want to deny equity or set their own price. Our top pair is well ahead of this merged leading range.
**Position:** Being in position allows us to see how the board develops and realize our equity more efficiently than if we were out of position.
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> **Takeaway:** When an opponent leads into the preflop raiser on a dry board, top pair is a pure call to keep their bluffs and weaker value hands in the pot.
Turn Analysis
Folding here is a significant error. While the Ace is a scare card, we still hold 57% equity against the Big Blind's range and only need roughly 28% to make a profitable call.
**Math:** We are getting 2.6:1 on a call. With our current equity, we are comfortably above the threshold required to continue, especially since we are in position and can potentially check back many rivers.
**Ranges:** Many of the hands the Big Blind donk-bet on the flop (like Tx or straight draws) will continue to barrel the Ace as a semi-bluff. Since we block some straight completions (KJ) and the opponent has many more draws than made Ax hands in this specific line, we cannot fold.
**Plan:** By calling, we allow the opponent to continue bluffing on brick rivers. If the river is a Ten or a Seven, our hand strength remains relatively stable as a bluff-catcher.
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> **Takeaway:** Don't over-respect a single overcard when you have a strong pair and the pot odds are favorable; you must realize your equity in position.
Note: Folding middle pair here is a massive over-fold; we have 57% equity and only need 28% to call profitably.