Folding bottom pair to a small turn bet when getting 4:1 is too tight; we must continue to realize our equity.
Flop Analysis
Calling is the standard play here. We have bottom pair on a board where the SB will be c-betting a high frequency of air and overcards.
**Ranges:** SB has a range advantage with overpairs like QQ-AA and top pairs like Q9s, but we have enough equity with a pair of fours to continue against their bluffs like As5d or gutshots like Th8h.
**Math:** We are getting 2.6:1 on a call, requiring roughly 28% equity. With 46% equity against their betting range, folding would be a massive mistake, and raising is mostly unnecessary protection.
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> **Takeaway:** Don't fold any pair on the flop when facing a single bet in a blind-vs-blind battle.
Turn Analysis
Folding here is a significant error. The SB sized down to roughly 1/4 pot, giving us incredible odds to see a river with a hand that still beats all of their missed overcards and draws.
**Math:** Facing a 4.6BB bet into 14.5BB, we need only 19.5% equity to call. Even though the Jack is a better card for the SB's range, our hand has roughly 34% equity, making this a clear continue.
**Sizing:** The small 32% pot bet from SB is often a 'range bet' or a thin value bet with hands like 9h8h. By folding, we allow SB to profitably bluff 100% of their air, failing to meet our Minimum Defense Frequency (MDF).
**Plan:** We can comfortably call and re-evaluate on the river. If we improve to two pair or trips, we have a clear value hand; otherwise, we can fold to large river barrels on most runouts.
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> **Takeaway:** When the price to see the next card is this cheap, you cannot fold made hands that still have showdown value.
Note: Folding bottom pair facing a small turn bet is too tight; you need to call to prevent Villain from over-bluffing with air.