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Unit 05Foundations6 min

Preflop Foundations

Win the pot before the flop by never entering it wrong.

The idea

Most losing players bleed chips before a single community card appears — limping, calling too wide, defending trash from the blinds. Preflop is where the cheapest, highest-frequency mistakes live.

The fixes are memorisable: raise or fold (rarely limp), size opens consistently (2–2.5bb), and know your three responses to a raise — fold, call, or 3-bet — as a function of position and who opened.

Get preflop right and every postflop decision starts from a stronger, better-defined range. It's the compounding base of the whole game.

The vocabulary

Words that carry weight.

3-bet

A re-raise of an opener. Your polarised strong-and-bluff response that seizes initiative.

Open size

The standard raise (2–2.5bb online). Consistency stops observant players reading your hand from your sizing.

Blind defense

How wide you call or 3-bet from the blinds — wider vs late-position steals, tighter vs early opens.

Limp

Just calling the big blind. Almost always a leak — it caps your range and invites the field.

The drill
?

It folds to you on the button with 55. Limp, call, or raise?

Show the answer →

Raise. Limping surrenders the initiative and the chance to steal the blinds outright. 55 on the button flops a set 12% of the time and plays beautifully in position — open it every time.

Take this to the table

Raise or fold. Consistent sizing. Know your fold/call/3-bet answer before you're in the seat.