Skip to content

Opening Range

12bb CO Opening Range — Short-Stack RFI Strategy

At 12 big blinds from the CO, GTO opens about 34% of hands — a mix of min-raises (~0%) and jams (~22%) rather than a pure shove. The grid below shows the full first-in strategy.
Jam Min-raise Limp Fold Partial fill = mixed frequency

Crafty Penguin GTO solver · MTT Chip-EV · 8-handed · 12bb effective · updated Jul 28, 2026

Drill this exact spot against the solver

Get instant feedback on every opening decision at 12bb CO.

Train this spot →

or explore the full solution in the solver →

How to play 12bb from the CO

This is a first-in spot: everyone folds to you in the CO, and you're deciding whether to commit at 12 big blinds. The solver opens about 34% of hands here. The tighter the position, the fewer hands clear the bar to commit your stack — every hand you jam has to show a profit against the calling ranges left to act behind you.

At this depth the solver keeps a raise size in the mix, so the strongest hands don't simply jam — ATs jams about 100%. That's the key difference from a true push/fold spot: with more chips behind, min-raising lets you keep dominated hands in and play a postflop pot in position.

Read the grid left-to-right within each cell: teal is the jam frequency, amber a min-raise, blue a limp, and the dark fill is fold. A fully teal square is a pure shove; a split square is a mixed frequency the solver plays some percentage of the time. Drill the borderline hands — those are where most of the EV is won or lost.

Other positions at 12bb

12bb UTG 12bb MP 12bb LJ 12bb HJ 12bb BTN 12bb SB

CO at other stacks

10bb CO 15bb CO 20bb CO
← All opening ranges Push/fold charts (5–8bb) →

We use cookies to improve your experience and analyse site traffic. Cookie Policy