Hold'em table

Holding 9h 4s on the button, this hand is far too weak to open even in 3-handed play, making it a clear fold.

Button folded, so this is heads-up versus the big blind and I only need 50 more into a 150 pot. 79o is weak out of position, but the price is good enough to complete and see a flop rather than fold or inflate the pot.

JTs is a strong heads-up hand and I have position on the SB limper, so I'll raise for value and initiative rather than just checking my option.

79o is too weak to continue out of position after the big blind raises my limp to 300. Folding saves chips for better spots.

87o is connected and playable enough to open from the button in three-handed; a small raise takes the initiative rather than limping or folding.

J6s from the small blind is too weak to defend against a button raise: the jack is often dominated, I'm out of position postflop, and the big blind still has to act behind me. Folding despite the ~3:1 price is the better long-term play.

Defending the big blind getting attractive pot odds (150 to win 400) with a playable suited two-gapper against a button open.

I flopped top pair on a monotone board without a heart in my hand. Out of position, checking to control the pot size is the standard and safest play.

I have a pair of sevens with no heart on a monotone, low connected flop. Checking controls the pot and keeps my showdown value rather than bloating a spot where I am often behind or dominated.

We have second pair without a heart on a four-flush board; checking is standard to control the pot.

I have only a pair of sevens and no heart on a four-heart board, so there is little value in betting into a range that can easily have a flush. Checking keeps the pot small and realizes a free river.

The board contains five hearts, giving both players at least a king-high flush. Checking is best since betting risks running into any heart in opponent's range.

The board is already a king-high heart flush and I have no heart, so I only chop or lose. Betting gets called by any heart and only steals a split at best, so I check.

On the button 3-handed, J9o is marginal but position lets me play it; a standard 3x open builds the pot when I connect and applies pressure to the blinds.

Folding 42 offsuit from the small blind facing a button open raise.

A3o is dominated and plays poorly out of position against a button 3x open, so folding is better than calling 200.

Opening K7s on the button in 3-handed play is standard and profitable.

56o is too weak to continue out of position against a button open; folding saves chips.

J4 offsuit is far too weak to defend the big blind against a button raise; calling 150 more with no equity or playability loses the least over time.

92o is among the worst starting hands and does not have enough equity or playability to call or raise from the button.

A7o is a solid button open in 3-handed play; raising to 3bb applies pressure on both blinds and builds the pot with position.

Nine-deuce suited is well below the threshold to defend out of position against a 3bb open raise.

65 offsuit is too weak to continue out of position against a button open; folding saves the remaining stack.