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Check-raise & Probe Bets
Lesson 11 · OOP aggression and probe bets · 32 practice questions
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The check-raise is the big blind's best weapon. Out of position you cannot bet first without giving away your hand and facing a raise, so you check — and when villain c-bets into a board that hits your range, you raise. For value, the check-raise turns his small c-bet into a big pot while you are ahead and denies the cheap turn card to his draws. As a semi-bluff with a big draw, it takes the pot down immediately often enough, and when called you still hold plenty of outs. Wet boards are where both halves work best: they hold your sets and straights, and your flush-plus-straight draws.
Example. On 9♥8♥2♣ you flop bottom set with 2♠2♦ and villain bets 3 into 6. Calling invites a heart or a straight card for a bad price; raising builds the pot now against all his top pairs and draws — raise. On 7♥6♥2♣ with 9♥8♥ you hold a flush draw plus an OESD: 15 outs, about 32% on the next card, against a bet of 3 into 6 that needs only 25% (3:1). A call is already profitable; a check-raise adds fold equity — as a pure bluff a raise to 10 would need villain to fold 10/(6+3+10) ≈ 53% of the time, but with 32% equity behind it you need far fewer folds. Both lines are correct.
Common mistake: slow-playing sets on wet boards 'to trap'. Every heart and every straight card on the turn can kill your action or your hand; the trap is the raise.
Probe bet
When the preflop raiser checks back the flop, he has told you something: his range is capped. Strong hands — top pair with a good kicker, overpairs, sets — almost always c-bet, so the hands that check back are mostly medium pairs, ace-high and missed draws. On the turn the big blind can seize the betting lead with a 'probe' bet: value with hands that beat that capped range and need protection, and bluffs on cards that look scary for it.
Example. On A♠8♦3♣ villain checked back the flop; the turn is the K♦ and you hold K♥J♣ (pot 6). A hand that checked back A-8-3 almost never has an ace — it would have bet — so your pair of kings is now ahead of nearly everything that stays: bet for value and protection. On Q♠7♦2♣ A♥ — the ace arrives on the turn — you hold J♦T♣ (jack-high, with only a gutshot to Broadway). The ace is a card villain's capped range hates: a probe of 4 into 6 needs only 4/(6+4) = 40% folds to break even, and a range that could not bet Q-7-2 folds far more than that to an ace — bet. Even with 6♥4♥ (an OESD: a 3 or an 8 makes a straight) on K♦7♠2♣ 5♥ after a check-check flop, betting is right: 8 outs, about 17%, plus fold equity.
Common mistake: checking to the raiser again on the turn. Once he has checked back, waiting for him to bet lets his medium hands see a free river.
Don't overuse
Check-raises and probes create big pots out of position, so they must be earned by the board and the price. Two limits keep them profitable. First, do not check-raise bluff on boards that favor the raiser: on A-K-x villain's range holds far more strong hands than yours, so a raise gets called and you are drawing thin. Second, on boards that favour the raiser, do not lead into him with your strong hands — a donk bet takes away his c-bet, which is exactly the bet your check-raise wants to attack. Let him bet, then raise. Low, connected flops that hit your calling range harder than his are a different case: there leading has its own place, and course 21 covers it.
Example. On A♥K♦6♣ villain bets 5 into 6 and you hold 5♥4♥ — no pair, no draw. As a pure bluff a check-raise to 15 would need villain to fold 15/(6+5+15) ≈ 58% of the time, on a flop where his range is full of aces, kings and overpairs that never fold. Fold and wait for a better spot. On J♠9♠5♣ you flop top two pair with J♥9♥ and are first to act: check. Villain c-bets this board often; checking keeps his bluffs and weaker pairs in, and sets up the raise. With T♠9♠ on 8♠7♠3♦ — a flush draw plus a straight draw — check-raising his c-bet is the default; on a low board like this, leading is the alternative course 21 teaches, not a mistake.
Common mistake: treating the check-raise as a move rather than a hand. If the board is bad for you and the bet is big, the disciplined play is the boring one: fold.
Key takeaways
• Wet flop, villain c-bets, you hold a set, two pair or a straight → check-raise for value.
• Wet flop, villain c-bets, you hold flush draw + straight draw (15 outs) → check-raise as a semi-bluff, or call; both are fine.
• Dry flop, small c-bet, you hold top pair → just call; raising folds out his bluffs.
• Raiser checked back the flop, turn is a scare card or improves you → probe bet, two-thirds pot.
• Ace-high or king-high flop, big c-bet, you hold air → fold; no check-raise bluff.
• Strong hand first to act on a flop that favours the raiser → check, don't donk; the raise comes after his c-bet. On low, connected flops that hit your range, leading is also fine (course 21).
Sample drill from this lesson
Best action?
Board: 9♥ 8♥ 2♣
Your hand: 2♠ 2♦
Best action: Raise Call
Why: ✓ You have a set — raise for value and protection, charging worse hands and draws.
FAQ
When should you check-raise the flop?
Check-raise out of position with strong made hands and high-equity semi-bluffs on boards that hit your range — it builds the pot with value and denies the c-bettor a cheap continue.
What is a probe bet?
A probe bet is a lead by the out-of-position player on a later street after the preflop aggressor checks back — attacking the range they capped by declining to c-bet.
Key terms in this lesson
Equity · Outs · Gutshot vs OESD (Straight Draws) · Range (Poker Hand Range) · Board Texture (Wet vs Dry) · Continuation Bet (C-bet) · Position (IP vs OOP) · Check-Raise · Probe Bet · Capped Range · Scare Card · Donk Bet (Lead) · Semi-Bluff · Fold Equity
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