GlossaryStrategy

Facing an open

Folding, calling or 3-betting after a player in front of you has raised.

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What it means
The skills for acting after an open: defending the big blind, playing in position on the button, and the awkward small blind with the big blind still behind.
How it is calculated
Compare the price of calling with how well the hand plays after the flop, and 3-bet the hands that are strong enough for value plus some that make good bluffs. Position decides how wide you can call.
Worked example
The button opens to 2.5bb. In the big blind the pot is 0.5 + 1 + 2.5 = 4bb and you need 1.5bb more to call, so you need 1.5 ÷ 5.5, about 27%, equity. That good price is why the big blind defends wide.
Why it matters
Most pots you play are decided here. Calling too much out of position and never 3-betting are both steady leaks.

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See also: 3-bet, Pot odds, Position