Short Deck 6+ Flush vs Full House: Strategy and Probability Deep Dive

Introduction

Short deck 6+ (also known as 6+ Hold'em) is a fast-growing poker variant where all cards 2 through 5 are removed from the deck, leaving only 36 cards. This change significantly alters hand probabilities and hand rankings. In traditional Texas Hold'em, flushes occur more frequently than full houses, but in short deck, because the probability of pairs and trips increases dramatically, full houses become more common strong hands, while flushes are relatively devalued. Understanding the relative strength between the two is crucial for building a profitable strategy.

Probability Comparison

In short deck games, hand probabilities undergo fundamental changes. Below are the probabilities of making hands from flop to river (based on a 36-card deck, assuming you hold a flush draw or three of a kind):

• Flush: Holding a four-flush on the flop, the probability of completing the flush by the river is about 35% (roughly 2.2:1 odds), slightly higher than traditional Texas Hold'em (about 34%), but the difference is small.
• Full House: Holding three of a kind on the flop, the probability of improving to a full house by the river is about 33% (roughly 2:1), much higher than the ~15% in traditional Hold'em. If you already have a pair on the flop, the chance that an opponent hits trips or a full house also increases significantly.
• Frequency: In short deck, full houses appear on the final board about twice as often as in traditional Hold'em, making flushes no longer "unbreakable" strong hands.

Flop: Drawing Decisions

Flush Draw vs. Potential Full House

When the flop contains a pair (e.g., flop K♠ K♦ 7♣), and you hold a flush draw (e.g., A♠ 10♠), you must consider that opponents may hold a King (already trips) or a pocket pair that could make a full house. Your flush draw is still strong, but if an opponent makes a full house, you will lose almost all your chips.

• Decision Principle: If the flop contains a high pair (e.g., K-K) and the pot is large, it is advisable to play flush draws conservatively. Only call if you are in position and getting good odds; otherwise, you should fold. Conversely, if the flop has a low pair (e.g., 6-6-10), your flush draw is more valuable because fewer opponents will hold pocket sixes (since sixes are marginal hands).

Flush Draw with a Pair

In short deck, a flush draw often comes with a pair (e.g., hole cards A♠ 7♠, flop 7♥ K♠ 3♠). You now have top pair and a flush draw, making this a very strong hand. Even if an opponent already has trips, you still have the flush draw to outdraw them.

• Action Advice: Bet or raise aggressively to force opponents off marginal hands while also gathering information.

Turn and River: Playing Made Hands

When you finally make a flush, but there is a pair on board, you must be wary of the possibility of a full house.

Reading Opponent Ranges

• Community Cards Have a Pair: If the river pairs the board (e.g., turn board is J♠ 9♦ 9♣, river J♥), your flush can lose to an opponent's full house (e.g., opponent holds J-9 or pocket jacks). In such cases, if the opponent bets large, you should consider folding unless you have a strong read that they are bluffing.
• Community Cards Have No Pair: Your flush is almost always the winner. Only beware of the very rare straight flush.

Value Betting and Bluffing

Because full houses are common in short deck, you should not overvalue your flush. When a possible full house appears on the river, adopt a "bet small, control pot" strategy:

• Example: You make a flush on the turn, and the river pairs the board. Bet a small sizing (about 1/3 pot) to extract value from weaker flushes while avoiding getting raised into a tough spot. If the opponent raises, it's usually a full house or better, and you can safely fold.

Practical Examples

Example 1: Flush Loses

Hand: Hole cards A♠ J♠, flop K♠ 10♠ 7♦ (two to a flush, no pair). Turn 8♠ gives you a flush, river 7♣. The community cards now have a pair of sevens. Opponent bets pot.

• Analysis: Opponent could hold K-7 or 10-7 for a full house, or also A-K, K-Q, etc. Since you hold the A♠, you block some flush combos, but a full house is possible. Fold cautiously, as opponents in short deck rarely bet this large on the river without a strong hand.

Example 2: Full House vs. Flush

Hand: Hole cards 8♠ 8♥, flop 8♦ 6♣ 2♣. You have trips. Turn 9♣ gives a flush draw on board. River 7♣ completes the flush. Opponent bets.

• Action: Your trips have improved to a full house (8-8-8-7-6? Actually trips+ a pair makes a full house. Here the board is 8-6-2-9-7, no pair, so you only have trips, not a full house. Suppose instead the river is 6♣, then the board has a pair of sixes, and you make a full house. In that case, your full house is strong. Bet or raise for value.

Summary

In short deck 6+, flushes are still powerful, but you must always be alert to the possibility of being outdrawn by a full house. Key adjustments include:

• Be cautious with flush draws on paired boards on the flop.
• Use pot-control strategies when you make a flush and the board shows potential full houses.
• Apply combinatorial math to estimate opponent ranges and avoid overcommitting with a strong but vulnerable hand. By adapting to these probability changes, you can maintain an edge in short deck games.