Poker Sizing Tells Study Guide

Poker sizing tells are the single most exploitable information leak in online cash games at 200NL and below — yet they appear in almost zero traditional training content. A sizing tell occurs when an opponent’s bet size communicates more about their range than they intend: a check-raise that is too small for the board, a bet that is too large relative to their likely holdings, or a raise sizing that only makes sense if they hold a specific narrow range. Unlike live tells that require physical reads, online sizing tells are mathematical. Once you understand what each sizing pattern signals, exploiting it becomes a repeatable, systematic process.

This guide is built from a specific data set: Avery Nitkin (PlayItSmart) playing three tables of live 200NL Rush Cash on GGPoker inside the Upswing Poker Lab 2.0. Across Sessions 4, 5, and 7 of his Play & Explain series, he identifies, names, and exploits opponent sizing tells in real time — narrating every read as it happens. This guide extracts the three core tell types from that data set and maps a counter-play strategy to each.

What Is a Sizing Tell in Online Poker?

A sizing tell is any instance where an opponent’s choice of bet size reveals their range more clearly than their range should allow. It is a mismatch between the size they chose and the size that their actual hand distribution would choose in that spot.

The underlying logic is simple: every bet size has an optimal range composition behind it. A large bet on a blank turn implies a polar range — strong hands going for value, or complete air going for maximum fold equity. A small check-raise on a dry ace-high board implies a capped range — weak hands too afraid to commit without the nuts. When an opponent bets a size that is inconsistent with what their range should contain, they have accidentally communicated the contents of that range.

Why Sizing Tells Work at 200NL — and Why Solvers Cannot Help

Solver-generated strategies assign bet sizes based on what maximizes EV across the entire range simultaneously. In a perfectly balanced solver strategy, a given bet size on a given board texture uses a specific range composition — and that composition is designed to make exploitation difficult.

Most 200NL players study solvers but implement them incorrectly. They learn that they should use a small size in some spots and a large size in others, but they fail to adjust which hands go into each sizing. The result: a small check-raise that should contain nutted hands gets used only with weak draws. An overbet that should be polar gets used with all top pairs. The sizing tells exist because players have learned sizing frequencies without learning range composition behind each size.

As Avery states directly in his Session 4 data: “You definitely don’t want to just have your small bets be weak hands. There are spots where you want that for sure and other spots you want your small bets to be the nutted parts of your range to induce — really depends on the spot.” The fact that he is teaching this to his audience confirms it is a systematic error in the pool he is exploiting.

Tell Type 1 — The Undersized Check-Raise on Dry Boards

From the live session data (Session 5): Avery encounters an opponent who check-raises small on a dry ace-high board. His in-session narration is specific: “My opponent just played a very poor sizing scheme, essentially telegraphing his hand and range. He goes for a small check-raise on the flop on a dry ace-high board where he wants to be playing a larger sizing.”

At this point he does not yet act aggressively. He notes the tell, continues, and waits for the turn. The tell gets confirmed on the next street when the opponent again uses a small size on a board where all strong hands want to go larger: “On the turn, that gets 100% confirmed when he chooses a small sizing in a board that all of his value hands want to go larger.”

The consequence: Avery raises the turn. His conclusion: “Almost his entire range is basically worse than two pair.” He had not seen the opponent’s cards. He had seen their sizing pattern — twice across two streets — and derived the range mechanically.

Counter-Play: How to Exploit Tell Type 1

Street	Action	Reasoning
Flop	Call or flat — do not over-react yet	One small sizing is suspicious, not conclusive
Turn	Raise if they continue with small sizing	Second small size = range confirmed as capped
River	Bluff-catch aggressively if they fire large	Capped range that now over-bets = polarized bluff, not value

Tell Type 2 — Small Bet on High or Connected Boards

From the live session data (Sessions 4 and 7): In Session 4, Avery encounters a player who bets small on a board that has flush and straight potential. His read: “Given that I had the King of Spades and the nature of the board, he’s not going to have a flush that often, and he’s only representing a flush for that sizing.” The small bet on a board that demands large sizing from nutted hands signals the opponent cannot have the hands that would justify the sizing.

In Session 7, encountering a quarter-pot bet on a connected board, Avery’s conclusion is direct: “The likelihood of him having a balanced range, having enough two pair plus in that sizing on that board is pretty unlikely.” He then increases his aggression: “You want to take more hands that are going to be low-frequency plays and start taking them at higher frequency” when opponents signal weak ranges through small sizing.

Counter-Play: How to Exploit Tell Type 2

Scenario	Response	Why it works
You have medium pair, backdoor draws	Float or raise	No two-pair+ in their range = no strong hand to punish you
You have air with equity	Call flop, barrel aggressive turns	They cannot credibly rep strength on future streets
You have strong hand vs their small bet	Raise to price out draws they claim to not have	Their small sizing on draw-heavy board = draw itself or very weak

Tell Type 3 — Min-Raise or Micro-Raise Against an Overbet

From the live session data (Session 7): Avery overbets the turn and faces a min-raise. His in-session narration: “He gave sizing tells on the turn. He went for a min raise against my overbet there where he’s representing like king-five and pocket-fives on such a connected board. The likelihood of him raising bigger is super high — which he should do. Should not have that small raise size.”

He identifies the range the opponent’s sizing implies: “I think he’s going to have a lot of like worse kings and maybe some like ace-tens to quote-unquote freeze me.” The min-raise is not a strong hand applying maximum pressure — it is a mediocre holding trying to discourage further aggression without committing to a large pot. Avery’s response: continue barreling after identifying the tell.

Counter-Play: How to Exploit Tell Type 3

Context	Response	Logic
Connected board, min-raise vs your overbet	4-bet or continue barreling next street	Strong hands 3-bet large — min-raise = defense, not value
Dry board, min-raise vs your standard bet	Proceed cautiously — could be trap	Dry boards reduce draw-heavy explanations for small raise
You have strong made hand vs min-raise	3-bet large for value if board is draw-heavy	Their range is capped — charge it hard before river

Multi-Street Confirmation: When a Tell Becomes a Lock

A single sizing tell is useful. A sizing tell confirmed across two streets is a near-certain read. This is one of the most important principles from the live session data.

In the Session 5 King-8 hand, Avery notes that the flop small check-raise was suspicious on its own — “That, in and of itself, is whatever. Like, it is likely some weaker hands.” He does not over-react. He continues. On the turn, the same opponent again uses a small sizing on a board where all value hands want to go larger. Now the tell moves from suspicious to confirmed: “On the turn, that gets 100% confirmed when he chooses a small sizing in a board that all of his value hands want to go larger. So that’s why I go for the turn raise — because almost his entire range is basically worse than two pair.”

The key practical instruction: do not over-exploit a single sizing anomaly. Wait for the second data point. Once an opponent repeats the same suboptimal sizing pattern on a second street, you have range confirmation — not suspicion. At that point, raise or re-raise aggressively.

Sizing Tell Cheat Sheet: Quick Reference Table

All patterns verified against live 200NL GGPoker Rush Cash session data.

Sizing Pattern	Board Context	Range Signal	Counter-Action	Confidence
Small check-raise	Dry / ace-high	Capped — no two-pair+	Call flop, raise turn if pattern repeats	⭐⭐⭐⭐
Quarter-pot bet	Connected / flush	No balanced range — draws or weak pairs	Float, raise medium pairs, barrel turns	⭐⭐⭐⭐
Min-raise vs overbet	Any, especially draw-heavy	Defensive — mediocre holding	4-bet or continue large on next street	⭐⭐⭐⭐
Overbet only on flush board	Monotone / three-flush	Polarized — flush or nothing	Call only with nut blockers or strong catchers	⭐⭐⭐
Repeated small sizing (2 streets)	Any	Range confirmed as capped / non-nutted	Raise aggressively on second street	⭐⭐⭐⭐⭐
Large bet on blank card	Turn or river	Polarized — set/two-pair or air bluff	Call with catchers, fold medium pairs	⭐⭐⭐

The Reverse: How to Avoid Giving Tells Yourself

Avery addresses this directly in Session 4: “You definitely don’t want to just have your small bets be weak hands. There are spots where you want that for sure and other spots you want your small bets to be the nutted parts of your range to induce — really depends on the spot and what you think of your opponent’s range composition in each spot individually.”

The anti-tell principle: your bet sizes should not be predictably correlated with your hand strength. If you always bet small when you are weak and large when you are strong, experienced opponents will read you as clearly as Avery reads his opponents in these sessions.

How Sizing Tells Affect Preflop Decisions

One of the least-discussed applications of sizing tell reads: they change which hands you are willing to defend preflop. Avery states this explicitly in Session 5: “If my opponent is going to have sizing tells in situations, you can get away with calling wider preflop.”

The logic is direct. If an opponent consistently uses undersized bets on boards where their strong hands want to go large, your implied odds for speculative hands increase. You do not need to make the nuts to win a large pot. You need to hit a pair, read their sizing, and raise them off a hand that has no business committing chips. Against an opponent with a confirmed sizing tell pattern, suited connectors and small pairs gain EV preflop — not because they improve the direct odds, but because the tell creates a more exploitable postflop environment.

The reverse is equally important: against an opponent who sizes correctly, the same speculative hands lose EV preflop. You cannot extract extra chips because they will not misrepresent their range postflop. This is a sophisticated but practical way to adjust preflop calling ranges dynamically based on player-specific data accumulated at the table.

For more on how Avery builds these reads from scratch in fast-fold formats, see his full Upswing Poker Lab 2.0 series and the full course review. The sizing tell framework is also discussed in detail by solver-based training tools in terms of balanced sizing construction — but the live exploitation application comes exclusively from player-pool observation.

FAQ: Poker Sizing Tells