Top Pair Facing a Flop Check-Raise: When Solver+ Calls, Folds and 3-Bets, Board by Board

You open the button, the big blind calls, you c-bet top pair and the big blind check-raises. Most players treat this as a hand-strength question: good kicker, continue; weak kicker, think about folding. Solver+ says the kicker is nearly irrelevant on the boards where this happens most. On K72 rainbow the button never folds top pair to a check-raise, not KQ, not K3 suited, at either raise size. On T86 rainbow, facing a 200% pot raise, QTo folds 99% of the time and QTs calls 80% of the time. Same kicker. The board and the suits decide, and the raise size tells you whether to call or re-raise.

This is the in-position side of Small Check-Raise or Big Check-Raise, which showed which hands the big blind raises with and why the sizes differ by board. Here the question is what the button does with top pair once the raise arrives.

The spot and the sizes

All data is from Solver+'s 100bb cash library, button versus big blind, single-raised pot: button opens 2.5bb, big blind calls, 5.5bb to the flop. On the dry and paired flops the button's default c-bet is a quarter pot (1.38bb), and the big blind's check-raise is either 3.45bb (50% of the 6.88bb pot) or 6.21bb (90%). Facing the small raise the button can fold, call or 3-bet to 7.59bb; facing the big one it can fold, call or 3-bet to 15.87bb. On connected flops the button's preferred c-bet is 80% pot (4.4bb) and the big blind raises to 11bb (111% of the 9.9bb pot) or 19.8bb (200%). Against the 19.8bb raise the button's only re-raise is all in.

Figures are per hand class after the check-raise, weighted by how often each hand c-bet that size in the first place. A hand that "calls 75%" calls with three quarters of its combos and does something else with the rest. Where the solver mixes, both actions are correct at the frequency shown.

Finding one: on dry boards, top pair never folds and the raise size picks the action

On K♠7♦2♣ the big blind check-raises 12.6% of its range small and 11.1% big. The button's response is the same shape at both sizes for every top pair: continue. What changes is how.

Button response with top pair after c-betting 1.38bb (25% pot) and facing a big blind check-raise. KTs / KQo / K9s and the offsuit row are rounded group averages (11, 9, 9% and 5, 5, 2, 1% 3-bet). Whole-range response: vs the 3.45bb raise fold 22%, call 67%, 3-bet 11%; vs the 6.21bb raise fold 41%, call 59%, 3-bet under 1%. BTN vs BB, 100bb cash. Source: Solver+.

Against the small raise the button 3-bets with 11% of its whole range, and top pair supplies a share of it: KQs re-raises half the time, KJs and AKs a quarter. The reason is in the big blind's small-raise range, which the earlier post showed is merged: weak top pairs, second pairs and trips on paired boards, hands that want to grow the pot but are not the nuts. Against that range KQ is a value hand, so it can raise and get called by K9 or 7x. The 3-bet range is not built from top pair alone. Bottom set (22) re-raises 77% and middle set (77) 53%, while top set KK re-raises only 9%, because KK blocks the Kx hands that would pay it off.

Against the big raise, re-raising disappears. The button 3-bets under 1% of its range and every top pair, from AK down to K3 suited, calls 100%. The 6.21bb raise is polarized: sets, two pair and no-showdown-value bluffs with backdoor equity. Against a polar range a re-raise folds out the bluffs and isolates you against the value, so the solver calls and lets the bluffs keep bluffing. The price is also easy. Calling 4.83bb more into a 13.09bb pot needs 27% equity, and top pair has that against a range that is half air.

Where do the button's folds come from, if not top pair? From the hands with nothing. Against the big raise, AJo folds 60%, the offsuit low aces fold outright, and the Q-high and J-high junk that c-bet for a quarter pot gives up. Suited ace-high with a backdoor flush draw (A3s to A5s) calls around 88%, offsuit A3o to A5o folds 100%. The same split shows up on A♥9♦4♣: every Ax top pair calls both sizes, and the folds are K-high broadways and offsuit second pairs like 98o (folds 80%) and J9o (60%).

Finding two: on a paired board the small raise is everywhere, and Kx keeps calling

On K♠8♦8♣ the big blind check-raises small with 36% of its range and big with only 2%. That is three times the small-raise frequency of K72, because trips and the weak Kx hands that cannot stand a big raise want a cheap raise that still charges the button's air. The button's answer is unchanged: it folds 26% of its range, calls 62% and 3-bets 11%, and no Kx hand folds. KQs 3-bets 21%, KTs 20%, KQo 17%, and the rest of the kings call close to 100%. The hands that re-raise most are trips: A8o 47% and A8s 38%.

The more interesting number on K88 comes before the raise. The button c-bets only 62% of its range on this board and checks 36%, and the checking is concentrated in the hands you would expect to bet. AKs c-bets only half the time, K5s and K6s c-bet about 10%. The paired board takes away the equity-denial reason to bet (the big blind's range has few live draws) and leaves top pair with a weak kicker happy to check and keep the pot small, which is the logic behind the delayed c-bet. By the time the check-raise arrives, the Kx hands that bet were the ones that wanted a bigger pot, and they continue.

Finding three: on connected boards the suits decide, not the kicker

On T♥8♦6♣ the button's c-bet is the 80% size with 57% of its range, and the big blind's response to it is to raise 11bb with 1.5% and 19.8bb, two times the pot, with 5.3%. Against the 11bb raise every top pair calls and T9s 3-bets a third of the time. Against the 19.8bb raise the button folds 59% of its whole range, and for the first time top pair is on the folding side of the line.

Button response with top pair after c-betting 4.4bb (80% pot) and facing a 19.8bb (200% pot) check-raise. Whole-range response: fold 59%, call 34%, jam 7%. BTN vs BB, 100bb cash. Source: Solver+.

Read the table in pairs. KTs calls 99%, KTo calls 69%. QTs calls 80%, QTo calls 1%. JTs calls 87%, JTo calls 17%. The kicker is identical in each pair and the decision flips on the suits. On a rainbow board every suited hand has a backdoor flush draw, and against a raise that puts 29.7bb in the pot with about 78bb behind once you call, that backdoor is the difference between a hand that can realise its equity on the turn and one that cannot. Calling 15.4bb needs 34% equity. Suited top pair with a backdoor gets there against a range of sets, two pair, combo draws and some overpairs. The offsuit version is a pair and nothing else, so it folds.

The jams are the other half of the pattern. ATo moves all in 72% of the time and ATs only 25%. T9o jams 88% and T9s 13%. ATo holds the best kicker and no backdoor, so it has the least to gain from seeing a turn and the most to gain from folding out the combo draws now. T9o has a pair plus a straight draw (any 7) and the same lack of backdoor equity, so it jams for the same reason. Their suited versions can afford to call and keep every option open. Across all top pair on T86, the button calls 34%, jams 7% and folds the rest, which is a long way from "top pair, continue".

9♠8♦4♣ tells the same story with a slightly weaker board for the button. Against the 19.8bb raise, K9s calls 91% and K9o folds 62%, Q9s calls 85% and Q9o folds 95%, J9s calls 99% and J9o calls 83%. A9o is the one offsuit top pair that stays in, calling 87% and jamming 12%. Weighted across every top pair that c-bet, the button folds 20%, calls 78% and jams 2%.

One hand: Q♠T♦ on T♥8♦6♣

You open Q♠T♦ on the button, the big blind calls, the flop is T♥8♦6♣. Top pair, queen kicker, no flush draw, no straight draw. You c-bet 4.4bb (QTo bets the 80% size 65% of the time here) and the big blind raises to 19.8bb. The pot is 29.7bb and the call costs 15.4bb. Solver+ folds 99%.

Before you fold, see what the big blind is doing. Its 19.8bb raise is 5.3% of its range: sets, two pair, 97 and 79 straight draws, and a few overpairs that chose to raise. Your queen beats none of the value and is not ahead of the draws by enough to call off a third of your stack with no way to improve. Now change one card: Q♠T♠. Same top pair, same kicker, and the solver calls 80%, because the backdoor flush draw adds the outs that let the hand continue on the turn. The decision was never about the queen.

Three questions when top pair faces a check-raise

1. Which size did they pick? A small raise on a dry or paired board comes from a merged range, so top pair with a strong kicker can 3-bet for value (KQs half the time on K72). A big raise is polar: call, never re-raise, never fold top pair.

2. Is the board dry or connected? On K72, A94 and K88 the button folds no top pair at any size. On T86 and 984, after an 80% c-bet and a 200% raise, offsuit top pair with a middling kicker folds and the button's whole range folds 58 to 59%.

3. Am I suited? On a rainbow connected board the backdoor flush draw decides the close calls: KTs, QTs and JTs call, KTo, QTo and JTo mostly fold. Best kicker with no backdoor (ATo) or pair plus straight draw (T9o) jams instead of calling.

If you would rather see the answer than remember it, Postflop+ deals you the c-bet, then the check-raise, and shows the solved response after you commit, so the merged-versus-polar read becomes a reflex instead of a lookup.

The takeaway

Facing a check-raise with top pair, the button's decision is set by three things that are not the kicker: the raise size, the board and the suits. Dry boards are a continue at every size, with the small raise opening a 3-bet for the strongest kickers and the big raise collapsing everything to a call. Paired boards get raised small far more often and change nothing for Kx. Connected boards, raised to two times the pot, are the one place top pair folds, and there the suited version calls while the offsuit version lets it go. Check the exact flop in Solver+ before you decide, because the difference between a 99% fold and an 80% call is one suit.