Low suited connector

Four-Three Suited

43s is a low connector with more straight coverage than 32s, but its gap to 54s changes the useful boards. It is mainly a late-position steal or a Big Blind defend with the right price. It rarely wants to build a pot preflop without a specific range and sizing conditions.

How to play 43s by position and stack size

Recommended action	UTG8-max	UTG18-max	LJ6-max	HJ6-max	CO6-max	BTN6-max	SB6-max
100bb+	Fold	Fold	Fold	Fold	Fold	Fold	Limp
40-100bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
27-40bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
20-26bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
16-19bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
11-15bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
7-10bb	Fold	Fold	Fold	Fold	Fold	Fold	Limp
6bb-	Fold	Fold	Fold	Fold	Fold	Fold	Limp

Open when:Button or Small Blind, unopened pot

It is too fragile for routine early-position opens. with depth for suited draws.

3bet when:Charted bluff with a suitable blocker and position

Its low cards alone do not justify a 3-bet.

Call when:Big Blind versus a late open at a playable price

Position after the flop matters more than 43s's nominal connectivity.

Jam when:Only

Do not turn a speculative defend into an automatic jam. a short-stack chart includes it without costly ICM pressure.

Fold when:Early action, large sizing

Its weak pairs and low flushes create costly reverse implied odds. shallow stack with little room.

Strong against

42s

42s shares the Four but has the weaker kicker, making a dominated pair that can still pay 43s.

Weak against

45s
45s shares the Four with the better kicker, so 43s can make a costly second-best pair.

Flop classes

Made straight

On 7♣ 6♦ 5♥, 43s makes the seven-high straight 3-4-5-6-7.

Made wheel straight

On A♦ 5♣ 2♥, 43s makes the five-high wheel A-2-3-4-5. It is a made straight, not a gutshot.

Low backdoors

On 9♠ 7♦ 2♠, 4♠ 3♠ has a flush draw, not a backdoor flush draw, because two hole-card spades and two board spades are already visible.

Strategic notes

Versus 3-bets

Fold against most 3-bets. A low suited connector needs a favorable price and enough depth to recover when it makes a second-best draw.
A Big Blind defend can continue at the right price, but a call from out of position against a strong range is not automatic.

Post-flop playability

43s can flop a made low straight or a gutshot toward a straight. Identify the exact missing rank before treating a connected texture as a draw.
A flop with this texture gives 43s a gutshot to a straight through a five. It is not open-ended.
A flop with this texture gives a backdoor straight route and a backdoor flush route only when the hole-card suit matches the two spades. It is not a made flush draw with one matching card.