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How board reading plugs into every other decision
♠P — PICTURE. Your sentence gets a second half. Not just "I have top pair" but "I have top pair, and the nuts here is a king-high straight, which I don't have." That's what makes the sentence actionable.
♠D — DOLLAR. Once you can see the nuts, you can see your customers. If the only hands that call you are the ones that beat you, that's exactly the no-payer situation — check.
♥A — ACT and ♥R — RESCUE. A bluff only sells if the story you're telling is available on this board. Betting big on K♠8♦3♣ to represent a flush is telling a story the cards forbid, and anyone paying attention calls. And when you hold a key card, your bluff genuinely has more force — you know he can't have the top of his range because you're holding it.
The DIAL. Availability isn't the same as likelihood. On a three-heart board the nut flush is available at every table size — but the chance somebody actually holds it rises steeply with the number of players. Four-handed, a scary board is often scary at nobody. Twelve-handed, assume the board's best hand is out there and make people prove otherwise.