Range construction
Construct ranges by purpose and position
Advanced preflop decisions start with a default range, but the edge
comes from understanding why each hand is opened, called, 3-bet, or
folded.
Range rule
Start with role, not hand class
Every combo needs a job: value, protection, blocker pressure, realization, or board-coverage support. A hand that is profitable as a button open can be a weak defend when it cannot realize equity out of position.
Range rule
Protect the top and bottom of each range
Your flatting, 3-betting, and 4-betting ranges should not reveal a single hand class. Keep enough strong hands in each branch that observant opponents cannot attack capped decisions automatically.
Range rule
Account for rake and stack depth
High rake trims loose flats and small suited connectors. Deep stacks add suited aces, connected broadways, and pairs that can win large pots when position and implied odds are present.
Range rule
Use frequency targets as guardrails
Advanced preflop work is not memorizing one chart. Use ranges as a baseline, then track whether your opens, calls, 3-bets, and folds drift too far from table conditions.