When should you bet only with strong hands and bluffs, and when should you include medium-strength hands? Master the fundamentals of range construction.
When you bet in poker, your betting range falls into one of two main structures.
River board: 8♠5♠2♦K♣3♥
Hero's 7♠6♠ = missed OESD (needed 4 or 9) + missed backdoor flush → pure air
Only 2 spades on the board, so no flush is possible (need 5)
Hero's betting range: strong made hands (sets, two pair, straights) + air (bluffs) = polarized
Medium hands (K9, JT — marginal pairs / top pair weak kicker) should check back
Polarized = Large sizes (75–200% pot)
Big bets increase the cost for opponents to call with bluff-catchers and maximize fold equity for your bluffs.
A♦T♦ = top pair middle kicker — not the nuts, but quite strong
Check back on the turn, then small river bet = thin value
Extracting value from Villain's weak aces (A4, A2, A8 with weaker kickers)
Instead of a big polarized bet, a small size induces wider calls
Merged = Small sizes (25–40% pot)
Small bets allow even opponents' weaker hands to call, maximizing thin value.
| Factor | Polarized | Merged |
|---|---|---|
| Range composition | Nuts + air | Strong through medium, continuous |
| Medium hands | Check | Bet (thin value) |
| Bet size | Large (75–200%) | Small (25–40%) |
| Ideal situation | Draw-completing boards, high SPR | Dry boards, checked-down pots |
| Bluff proportion | High (big bets allow more bluffs) | Low (small bets are value-focused) |
Source: Upswing Poker, GTO Wizard Blog
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