Big blind defense in cash games: which hands to call, when to 3-bet and how to play postflop

The price you get in the BB

The price is the minimum equity you need to call: what you pay divided by the final pot. At 6-max cash, 100 bb, with the SB folded:

That number is raw equity. Out of position you do not realize all of it: the opponent acts last on every street, folds you out of hands that had equity and gets more from strong hands. That is why equity realization matters as much as price: suited hands, connected hands and pairs realize better than disconnected offsuit hands.

Defending ranges against each position

The POKER AULA preflop charts for the BB (3-bet to 11 bb against 2.5 bb opens) boil down to this:

Follow one hand across the table. K♣7♦ is a call against the BTN and a fold against the CO, HJ and UTG. Q♠8♦ is a call against the BTN and a fold against everyone else. The price is the same in every case: what changes is the opponent's range. Against UTG, who opens 14% of hands, K7o is dominated by KQ, KJ and AK; against the BTN, who opens 45%, it wins often enough.

Suited hands are almost always defended: against the BTN the chart calls K2s+, Q2s+, J4s+ and lower suited hands such as 32s, because playability makes up for the positional disadvantage.

3-betting from the big blind

From the BB the 3-bet is 11 bb against a 2.5 bb open (4.4 times) because you play out of position. Against a 3 bb SB open it is 9 bb, because there you have position.

Against the BTN the range has three parts:

• Pure value: QQ+, AKs, AKo.
• Medium value that mixes call and 3-bet: JJ-99, AQs, AJs, ATs, KQs, AQo, AJo, KQo. Against a BTN who folds a lot, 3-bet them more; against one who calls everything, call more and 3-bet for value.
• Bluffs: A5s-A3s, for the ace that blocks AA and AK.

The bluff is expensive: 3-betting to 11 bb puts in 10 more bb to win the 4 bb in the pot, so you need 10 / (4 + 10) = 71.4% folds to profit from folds alone. A5s is chosen because it still has equity when called.

If the BTN 4-bets to 24 bb, the chart goes all-in with QQ+ and AK, mixes JJ between all-in and call, and calls with TT, AQs and KQs.

Playing out of position after the flop

You called the BTN open: the pot is 5.5 bb, 97.5 bb remain behind and the SPR is 17.7. You almost always check to the preflop raiser and respond to their bet.

Defending against the small c-bet. If the BTN bets 2 bb into 5.5, you need 2 / 9.5 = 21.1% equity and your MDF is 73.3%. On K♠7♦2♣, 8♥7♥ (second pair) is an easy call. Folding everything except top pair hands the pot to any bet.

The check-raise is your weapon. On low, connected flops the BB has more two pairs and straights. On 9♥8♥4♣ you can check-raise 9♣8♣ (two pair) for value and 7♥6♥ (flush draw plus open-ender) as a semi-bluff.

Against the big bet (4 bb into 5.5) you need 29.6%: fold more hands with no pair and no draw.

Beware of top pair, weak kicker. With K♦5♣ on K♠7♦2♣ you have top pair, but against three bets you are behind KQ, KJ and KT. Control the pot.

Blind vs blind

In blind vs blind the SB opens to 3 bb with a wide range and you play in position. You call 2 bb for a 6 bb pot (33.3%), but position lets you realize more equity than in any other BB spot.

• 3-bet to 9 bb for value: TT+, AJs+, KQs, AQo+, mixing 99, ATs, KJs and QJs.
• Wide call: small pairs, many suited hands, A2o-ATo, K7o-KTo, Q9o+, J9o+, T8o+, 98o, 87o.

If the SB just completes (limps), there is nothing to pay: check, or raise to 4 bb with your best hands and some suited connectors such as 98s or T9s.

Common big blind mistakes

1. Overfolding against the BTN. Its open is a steal with 45% of hands; folding K7o or 65s hands over the blinds.
2. Defending the same range against everyone. The K7o you call against the BTN loses money against UTG.
3. Small 3-bets. Reraising to 6 or 7 bb out of position gives the opener a great price to call with position.
4. Folding to every c-bet. Against 2 bb into 5.5, defending less than half your range lets the opponent profit with any two cards.
5. Donk betting with no plan. Leading without a concrete reason (a card that strongly favors your range) usually wastes your strong hands.

How to practice it

Start with the BB vs BTN chart, the one you will use most. Then compare it with the UTG chart hand by hand: the differences teach you more than memorizing each one separately. At POKER AULA, blind defense is an Intermediate level module and returns in Professional with the BB and SB at 100 bb. The Preflop Charts show every spot with its size, the Calculator gives you price and MDF, and Training lets you decide with the correction and THE WHY. The 48-hour free trial opens all of it.