BB 3-Bet vs CO 4-Bet
CO 4-bet to 19.8 bb. Jam or call with the top of your 3-bet range; fold the bluffs.
Hands at a glance
All-in (43% of hands)
Always: AA, AKs, KK. Sometimes: A5s (30%), A4s (20%), AKo (70%), QQ (50%).
Call (23% of hands)
Sometimes: AQs (80%), AKo (30%), QQ (50%), JJ (80%), TT (50%).
Each square is a starting hand: pairs on the diagonal, suited hands above it, offsuit below. A square split in two colors is a mix: play it each way that often.
How to play it
You 3-bet a Cutoff open from the Big Blind, and the Cutoff 4-bets. Your 3-betting range here is 5% of all starting hands (the colored squares). Go all-in with 43% of it, call 23% and fold the other 34%.
Against a Cutoff open your 3-bet range is mostly strong hands, so most of it continues against a 4-bet.
Facing the same 4-bet from the CO: the BTN folds 44%, the SB folds 65%.
Related charts: BB vs CO Open, CO Open vs BB 3-Bet, CO Open Range.