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Club: your seat
Club is about where you are sitting. It is the cheapest edge in poker and the one beginners give away without noticing, because the same two cards are a raise in one chair and a fold in another. Four rules, and the last one is about not being readable.
The letters, in order: C, L, U, B. Each one is a single question you ask before you act. Run them in order and most hands answer themselves.
Four rules, spelled C-L-U-B: Careful, Loosen, Unpredictable, Blinds
Everything in SPADE and HEART bends around one question: where are you sitting relative to the button? This section is the map. And it ends with the rule that keeps a beginner from being eaten alive: the art of not being predictable.
First, the geography. The button moves one seat left each hand, so you'll rotate through every zone:
[ BUTTON ] ← acts last: the throne
LATE ───── [ CUTOFF ] ← one before the button: nearly as good
[ MIDDLE SEATS ]
EARLY ───── [ FIRST SEATS AFTER THE BLINDS ] ← act first: the mud
[ SMALL BLIND ] [ BIG BLIND ] ← forced bets, act first after the flop