Big blind defense: you are folding away money you already paid

The big blind is the only seat where the pot starts with your money in it. That changes the math so much that ranges which would be unplayable anywhere else become mandatory defends, and yet the average low-stakes player folds their big blind to a steal 70% of the time or more, handing the button a printing press.

Why the price is so good

Say the button min-raises to 2 big blinds. You have one blind in already, so continuing costs you exactly one more to see a pot of 4.5. You are getting better than 3-to-1 to see three cards while closing the action: nobody can re-raise behind you. You need well under 30% raw equity for the call to work, and almost every two playable cards clear that bar against a button opening range.

Fold 97 offsuit here and you are not being disciplined. You are refusing free equity because the hand looks ugly.

A workable defense range

Against a typical 2.2x button open, defend around 55% to 65% of hands from the big blind:

Always: every pair, every suited ace, every suited broadway, suited connectors and one-gappers down to 54s, offsuit broadways, offsuit connectors down to about 87o.

The judgment band: weak offsuit hands like Q5o, J6o, 93s. Against small opens these are marginal defends in theory; against larger opens or strong players, fold them without guilt. This band is maybe 5% of your win rate. The always-band is the leak.

3-bet the top and some junk: your best hands obviously, plus suited wheel aces and hands like K9s as bluffs. A big blind who never 3-bets makes the button's steal risk-free.

Playing after you defend

The defend is only step one, and this is where "defend wide" advice usually stops too early. Wide defense means you will miss most flops. The money comes from three postflop habits: check-raise the flops that favor your range (low and connected boards hit the big blind, not the opener), stab the turn when they check back a flop c-bet, and do not pay two big streets with second pair just because you flopped something after all that folding.

One more number to keep you honest: sizing changes everything. Against a 3x open your price gets far worse and the bottom third of the defend range goes back in the muck. Defending 87o versus a min-raise is discipline. Defending it versus a 4x is a different leak wearing this one's clothes.