Learn GTO preflop theory in MTT poker

6 of hearts4 of spades

Low offsuit one-gapper

Six-Four Offsuit

64o is a one-gapper, not a connector. Its six gives it more rank than 43o, but the four-gap structure makes straights less frequent than with 65o or 54o. Weak pairs and dominated sixes create substantial reverse implied odds.

Pocket33

How to play 64o by position and stack size

Recommended actionUTG8-maxUTG18-maxLJ6-maxHJ6-maxCO6-maxBTN6-maxSB6-max
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Open when:Almost never outside a very weak table

Its rank height is not enough to offset the gap and poor high-card value.

3bet when:Never as a standard bluff

It has no useful high-card blocker and is called by hands that dominate its pairs.

Call when:Only for a free big-blind flop or a very favorable price

A raise call leaves too many difficult low-equity turns.

Jam when:Only for a rare tournament-specific reason

Its hand strength does not support a normal shove.

Fold when:Facing a raise

The one-gapper rarely flops a strong draw and its pair outs are often dirty.

Strong against

No strong matchup to highlight.

Weak against

  • A of spades6 of hearts
    A6o

    A6o shares the Six with the better kicker, so 64o can make a costly second-best pair.

Flop classes

5 of spades7 of hearts8 of spades
Made eight-high straight

On 5♣ 7♦ 8♠, 64o makes the 4-5-6-7-8 straight. Bet for value, while watching for higher straights on later streets.

5 of spades7 of heartsK of spades
Gutshot straight draw

On 5♣ 7♦ K♠, 64o needs an eight to complete 4-5-6-7-8. Continue selectively and do not mistake the draw for a made hand.

A of spades9 of hearts6 of spades
Weak pair

On A♣ 9♦ 6♠, the pair of sixes is exposed to better sixes and overpairs. Check and fold to strong pressure.

Strategic notes

Versus 3-bets
  • Fold: Do not defend 64o against a standard 3-bet.
  • Avoid optimistic calls: Its gap reduces straight flops, while dominated pairs lose larger pots.
Post-flop playability
  • Continue with a specific draw: On connected boards, identify the exact straight draw before betting or calling.
  • Do not call down with a six: A pair of sixes is often behind a better six or an overpair.
  • Use position for pot control: Acting last helps realize the small amount of equity that remains after a miss.

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