poker.yoga

Big blind defence

The one seat that has already paid to be here. This is the exact price at every open size, the frequency that stops a steal being free, and defending ranges against the widest and tightest opener.

Defending against a BTN open

A 13 by 13 grid of every starting hand, showing which ones keep playing against a BTN open — suited above the diagonal, offsuit below
High cardAKQJT98765432
AAAKeep playingAKsKeep playingAQsKeep playingAJsKeep playingATsKeep playingA9sKeep playingA8sKeep playingA7sKeep playingA6sKeep playingA5sKeep playingA4sKeep playingA3sKeep playingA2sKeep playing
KAKoKeep playingKKKeep playingKQsKeep playingKJsKeep playingKTsKeep playingK9sKeep playingK8sKeep playingK7sKeep playingK6sKeep playingK5sKeep playingK4sKeep playingK3sKeep playingK2sKeep playing
QAQoKeep playingKQoKeep playingQQKeep playingQJsKeep playingQTsKeep playingQ9sKeep playingQ8sKeep playingQ7sKeep playingQ6sKeep playingQ5sKeep playingQ4sKeep playingQ3sFoldQ2sFold
JAJoKeep playingKJoKeep playingQJoKeep playingJJKeep playingJTsKeep playingJ9sKeep playingJ8sKeep playingJ7sKeep playingJ6sKeep playingJ5sFoldJ4sFoldJ3sFoldJ2sFold
TAToKeep playingKToKeep playingQToKeep playingJToKeep playingTTKeep playingT9sKeep playingT8sKeep playingT7sKeep playingT6sKeep playingT5sFoldT4sFoldT3sFoldT2sFold
9A9oKeep playingK9oKeep playingQ9oKeep playingJ9oKeep playingT9oKeep playing99Keep playing98sKeep playing97sKeep playing96sKeep playing95sFold94sFold93sFold92sFold
8A8oKeep playingK8oKeep playingQ8oFoldJ8oFoldT8oFold98oFold88Keep playing87sKeep playing86sKeep playing85sKeep playing84sFold83sFold82sFold
7A7oKeep playingK7oKeep playingQ7oFoldJ7oFoldT7oFold97oFold87oFold77Keep playing76sKeep playing75sKeep playing74sFold73sFold72sFold
6A6oKeep playingK6oFoldQ6oFoldJ6oFoldT6oFold96oFold86oFold76oFold66Keep playing65sKeep playing64sKeep playing63sFold62sFold
5A5oKeep playingK5oFoldQ5oFoldJ5oFoldT5oFold95oFold85oFold75oFold65oFold55Keep playing54sKeep playing53sFold52sFold
4A4oKeep playingK4oFoldQ4oFoldJ4oFoldT4oFold94oFold84oFold74oFold64oFold54oFold44Keep playing43sFold42sFold
3A3oKeep playingK3oFoldQ3oFoldJ3oFoldT3oFold93oFold83oFold73oFold63oFold53oFold43oFold33Keep playing32sFold
2A2oKeep playingK2oFoldQ2oFoldJ2oFoldT2oFold92oFold82oFold72oFold62oFold52oFold42oFold32oFold22Keep playing
Keep playingFold
Defends:
22+ A2s+ K2s+ Q4s+ J6s+ T6s+ 96s+ 85s+ 75s+ 64s+ 54s A2o+ K7o+ Q9o+ J9o+ T9o
Share of hands:
43.0% of all 1,326 starting hands

Defending against a UTG open

A 13 by 13 grid of every starting hand, showing which ones keep playing against a UTG open — suited above the diagonal, offsuit below
High cardAKQJT98765432
AAAKeep playingAKsKeep playingAQsKeep playingAJsKeep playingATsKeep playingA9sKeep playingA8sKeep playingA7sKeep playingA6sKeep playingA5sKeep playingA4sKeep playingA3sKeep playingA2sKeep playing
KAKoKeep playingKKKeep playingKQsKeep playingKJsKeep playingKTsKeep playingK9sKeep playingK8sFoldK7sFoldK6sFoldK5sFoldK4sFoldK3sFoldK2sFold
QAQoKeep playingKQoFoldQQKeep playingQJsKeep playingQTsKeep playingQ9sKeep playingQ8sFoldQ7sFoldQ6sFoldQ5sFoldQ4sFoldQ3sFoldQ2sFold
JAJoKeep playingKJoKeep playingQJoFoldJJKeep playingJTsKeep playingJ9sKeep playingJ8sFoldJ7sFoldJ6sFoldJ5sFoldJ4sFoldJ3sFoldJ2sFold
TAToKeep playingKToFoldQToFoldJToFoldTTKeep playingT9sKeep playingT8sKeep playingT7sFoldT6sFoldT5sFoldT4sFoldT3sFoldT2sFold
9A9oFoldK9oFoldQ9oFoldJ9oFoldT9oFold99Keep playing98sKeep playing97sKeep playing96sFold95sFold94sFold93sFold92sFold
8A8oFoldK8oFoldQ8oFoldJ8oFoldT8oFold98oFold88Keep playing87sKeep playing86sKeep playing85sFold84sFold83sFold82sFold
7A7oFoldK7oFoldQ7oFoldJ7oFoldT7oFold97oFold87oFold77Keep playing76sKeep playing75sFold74sFold73sFold72sFold
6A6oFoldK6oFoldQ6oFoldJ6oFoldT6oFold96oFold86oFold76oFold66Keep playing65sKeep playing64sFold63sFold62sFold
5A5oFoldK5oFoldQ5oFoldJ5oFoldT5oFold95oFold85oFold75oFold65oFold55Keep playing54sKeep playing53sFold52sFold
4A4oFoldK4oFoldQ4oFoldJ4oFoldT4oFold94oFold84oFold74oFold64oFold54oFold44Keep playing43sFold42sFold
3A3oFoldK3oFoldQ3oFoldJ3oFoldT3oFold93oFold83oFold73oFold63oFold53oFold43oFold33Keep playing32sFold
2A2oFoldK2oFoldQ2oFoldJ2oFoldT2oFold92oFold82oFold72oFold62oFold52oFold42oFold32oFold22Keep playing
Keep playingFold
Defends:
22+ A2s+ K9s+ Q9s+ J9s+ T8s+ 97s+ 86s+ 76s 65s 54s ATo+ KJo
Share of hands:
19.5% of all 1,326 starting hands

The price of defending, at every open size

Exact arithmetic, not a range: what a call costs, what it is calling into, and the raw equity it needs to break even. The last column is the frequency the blinds have to defend between them before an open stops being free money.

Cost of a big-blind call, resulting pot, break-even equity and minimum defence frequency at each open size
OpenTo callPotBreak-evenMin defence
2bb1bb4.5bb22.2%42.9%
2.5bb1.5bb5.5bb27.3%37.5%
3bb2bb6.5bb30.8%33.3%
3.5bb2.5bb7.5bb33.3%30.0%
4bb3bb8.5bb35.3%27.3%

Blinds of 0.5/1, small blind folded, so its half blind is dead money in the pot. Break-even is raw equity — out of position you will not realize all of it, which is why real defending ranges sit tighter than the price alone implies.

Why the big blind defends so wide

Every other seat starts a hand with nothing in the middle. The big blind starts with one blind already paid, which changes the maths of every decision that follows: you are not deciding whether to invest, you are deciding whether to abandon an investment you have already made.

That is what the price table above measures. Against a 2.5bb open you are risking 1.5 to win 5.5, so a call breaks even at just over 27% raw equity — a bar that most two-card holdings clear. What it does not measure is realization: out of position, with the initiative in the other player's hands, you will not collect all of that equity, which is why real defending ranges are tighter than the raw price suggests.

The other number is the one that keeps opponents honest. A raise to 2.5bb risks 2.5 to win the 1.5 in blinds, so if the blinds fold more than 62.5% of the time between them, the raise prints with any two cards. Defending is not generosity — it is the reason a wide steal stops being free.

BB spots to practise

Real hands from the trainer where you are sitting in this seat. Each one shows the solver-verified answer before it asks you to trust anything.

FAQ

How wide should you defend the big blind?

It depends entirely on who opened. Against a button open, something like 43% of hands; against an under-the-gun open, closer to 20%. Both charts are on this page. The rule underneath is that defence tracks the opener's range, not your own optimism.

What pot odds does the big blind get against a raise?

Against a 2.5bb open you call 1.5 into a pot of 5.5, which is just over 27% break-even equity. Against a 3bb open it is 2 into 6.5, or about 31%. The full table on this page prices every common size, including the minimum defence frequency.

Should you three-bet or call from the big blind?

Both, and the split matters more than the total. Three-bet the hands that want the pot heads-up and can stand a four-bet, call with the ones that flop well and lose value when the pot grows. This chart merges them: it answers whether to keep playing, not how.

The other seats