While 55 is a marginal bluff-catcher, folding the turn against a small sizing is slightly over-folding given the pot odds.
Flop Analysis
Calling is the standard play here. We have a weak made hand and a backdoor spade draw, which is enough to continue against a 70% pot c-bet.
**Ranges:** HJ has a range advantage on this Ten-high board, containing all overpairs (JJ-AA) and strong Tx. However, our 55 beats their air (AQo, KJs) and some smaller draws.
**Math:** We are getting 2.4:1 on a call, needing roughly 29% equity. With 43% equity against a standard c-betting range, we are well above the threshold to continue.
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> **Takeaway:** Don't fold small pairs on the flop when you have position and a backdoor draw to help you navigate later streets.
Turn Analysis
Folding is a very close decision, but calling is slightly preferred. The board pairing the deuce is actually a decent card for us as it reduces the likelihood HJ has a set and doesn't complete any primary draws.
**Ranges:** HJ's second barrel is polarized. They have strong value (Tx, 88, Overpairs) and many bluffs (AsXs, QJs, 97s). Our 55 is at the bottom of our calling range, but it's an effective bluff-catcher against their missed spades.
**Math:** Facing a ~35% pot bet, we need 26% equity to call. We have roughly 36% equity, making this a profitable continue despite the low absolute hand strength.
**Blockers:** Our 5h5s is a double-edged sword; we don't block the spade draw, which is good for HJ having bluffs, but we also don't block any of their folding range.
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> **Takeaway:** When the turn pairs the lowest card on the board and Villain uses a small sizing, your flop bluff-catchers usually need to stick around for one more street.
Note: Folding to a small turn bet is slightly too tight; 55 retains enough equity against a polarized range to call at least once more.