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The Nit

They fold too much, bluff only dry flops, and never bet the river light.

The Nit plays few hands and only puts money in with a strong one. They fold too much, and when they bet as the caller, raise, or bet the river, they have it. Even their one bluff is narrow: on a dry flop they fire a single c-bet with AK or AQ, then give up on the turn.

In short

Before the flop

The Nit opens about 11% of hands from under the gun and 23% from the button. Even their loosest range is tight.

The Nit's open from under the gun: 144 combos, about 11% of hands.
Their button open: 310 combos, about 23%. This is as loose as they get.

Their 3-bet is the very top, about 3% of hands wherever they sit. From the blinds it's the grid below; the cutoff and button drop AQs (40 combos), and under the gun and the hijack drop JJ too (34 combos: QQ+ and AK).

The Nit's 3-bet from the blinds: 44 combos.

When they just call an open from the blinds, they have the middle, shown below. JJ and better 3-bet instead. From the big blind they defend 12.5% of hands against a button open and fold the rest.

The Nit's call from the big blind: 122 combos. No JJ or better, no AK.

If you 3-bet them, they continue with the grid below and fold the rest: 84% of their button opens, 65% of their under-the-gun opens.

What continues against your 3-bet. Everything else folds.

QQ+ and AK 4-bet (34 combos); JJ, TT and AQs call (16). Against an all-in they call with only KK+ and AKs.

After the flop

As the raiser, the Nit c-bets the flop with top pair or better (any kicker), with an overpair, with the nut flush draw or a combo draw, and on a dry flop with AK or AQ as two overcards. Everything else checks, including AJ, KQ and KJ.

The Nit's range is almost all big cards, so on a low, dry flop the c-bet is about half real hands and half AK or AQ:

10♦6♣2♠
A dry flop. From their under-the-gun open, the Nit c-bets 65 combos (47%).

Their under-the-gun open is 137 combos once the board cards are out. The 65 bets are 6 sets, 24 overpairs, 3 top pairs and the 32 combos of AK and AQ. AJ, KQ and KJ check.

So the c-bet cuts their range in half, and the half that bluffs is exactly AK and AQ. A check is the other 72 combos: the pairs under the ten and the two-overcard hands below AQ:

What checks on T-6-2 from the under-the-gun open: 72 combos. 66 is a set here and bet.

On the turn they keep betting only an overpair, top pair with a good kicker (ten or better), two pair or better, and the nut flush draw or a combo draw. AK and AQ give up. Here the bets are sets, overpairs and ATs:

10♦6♣2♠7♥
After c-betting the flop, the Nit bets 33 combos and checks 32. A turn check is AK or AQ, nothing else.

On a wet flop even AK and AQ check (unless they hold the nut flush draw), because the overcards rule needs a dry board:

9♥8♥4♣
A wet flop. From the same range the Nit bets only 40 of 138 combos.

The 40 are sets, overpairs and 4 nut flush draws. A check is 71% of their range.

As the caller, they check everything but two pair or better, on every street. A bet from a Nit who called before the flop means two pair, a set or better.

J♦8♣4♠
The Nit called your button open from the big blind. On this flop they bet only 6 combos: 88 and 44. Every top pair checks.

Facing a bet, they:

Their handFlopTurnRiver
Two pairCall any sizeCall any sizeCall any size
Overpair, top pair good kickerCall any sizeCall up to 2/3 potCall 1/3 pot only
Top pair weak kickerCall any sizeFoldFold
Second or third pairCall 1/3 pot onlyFoldFold
Nut flush draw, combo drawCall any sizeCall any size—
Flush draw, open-enderCall up to 2/3 potCall up to 2/3 pot—
GutshotFoldFold—

Every one-pair hand folds to a raise. Two pair calls even a raise, but never raises.

A raise means a set or better, and they raise it every time. Two pair just calls.

On the river they bet only two pair or better, whether they raised before the flop or called. They never bluff.

In a 3-bet or 4-bet pot an overpair or top pair, good kicker is their strong hand. Whether they raised or called, they bet it on every street, the river included, and call any bet or raise with it, where in a single-raised pot it checks to the raiser and folds to a raise or to a big turn bet. Weaker pairs still fold, and they still never raise one pair.

Say you opened the button, the Nit 3-bet from the big blind (JJ+, AQs+ and AKo: 44 combos) and you called:

9♣7♦2♠
They c-bet 24 combos, every one an overpair. Raise, and all 24 call.

AK and AQ check, because this flop isn't dry. In a single-raised pot every one of those overpairs would fold to your raise.

Call the c-bet instead and they bet every overpair again on the turn:

9♣7♦2♠4♥K♦
On this river they still bet AA and KK (now a set) and check QQ and JJ.

The king beat QQ and JJ. In a single-raised pot AA would check this river too.

In a limped pot they bet top pair and overpairs on the flop, and on the turn only a strong top pair or an overpair, instead of checking everything but two pair or better.

Say you limped the button and the Nit checked the big blind, which they do with every hand below 88, AJs, KQs and AQo:

J♦8♣4♠
On this flop they bet 147 of 1,101 combos: every top pair, plus two pair and sets.

Behind a raise only the 30 two-pair-or-better combos would bet.

How to exploit them

in both− they have, you left out+ you included, they don’t have
On J-8-4, after calling a 2/3-pot flop bet, the Nit holds exactly 27 combos. All 27 fold to a 2/3-pot river bet.

They are QJ, KJ and AJ, and all 27 call a 2/3-pot turn bet first. The read also painted TT and 99, which fold.

What this leak is worth. Small but steady: you win their blinds and small pots, rarely their stack. In the big blind they fold 87.5% of hands to a button open.

What their bet sizes tell you

Nothing. The Nit bets half the pot on a dry board, two-thirds on a medium board and three-quarters on a wet one, on every street, with a set and with AK alike. Raises are always three times your bet. What matters is whether they bet at all, and in which role.

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