Why Your C-Game Costs More Than Your A-Game Wins You (And the CBT Journal That Fixes It)

Most players spend 80% of their study time trying to improve their A-game. Better lines against 3-bets, tighter ranges in the blinds, exploitative adjustments versus specific player types. That work matters. I'm not going to tell you it doesn't.

But I want you to run a thought experiment with me.

Think about your last ten sessions. In how many of them did you play your A-game for the entire session? Not most of the session. Not the first two hours before you got tired. The entire session, start to finish, every decision clean.

If you're being honest, the number is probably two or three. Maybe one. Maybe zero.

Now think about those other sessions. The ones where you stacked off too light after a cooler. Where you opened a hand you knew was marginal because you were bored. Where you called a river bet you were 90% sure was the nuts because you couldn't bring yourself to fold after putting that much money in. Those were C-game hands. And they cost you more than your A-game study sessions will ever earn back. Your ceiling doesn't determine your win rate. Your floor does.

The math that changed how I think about my own game

I started tracking this six months ago using a simple system I'll walk you through below. After 30 days of data, the pattern was hard to argue with.

In sessions where I played my A-game for 90% or more of the hands, my win rate was strong. Roughly what you'd expect given my edge at the stakes I play. In sessions where I played my C-game for even 15% of the hands, my win rate dropped to break-even or worse, regardless of how well I played the other 85%.

Fifteen percent. That's about one in seven hands where I made a decision I wouldn't make if I were fresh, focused, and emotionally regulated. And that 15% was enough to wipe out every good decision I made in the rest of the session.

I'm not the only one seeing this. Barrault and Varescon (2013) studied 245 regular online poker players and found that cognitive distortions, biased patterns of thinking where you misread probability, cause and effect, or your own role in an outcome, were significantly more prevalent among players with gambling problems. The thing that made this study interesting for poker specifically is that it held even in a skill-based game. Knowing the math didn't protect players from distorted thinking under pressure (Cyberpsychology, Behavior, and Social Networking, 2013). Your C-game is a thinking problem. And thinking problems require a thinking tool.

What a "Mental Hand History" is and why it works

In Cognitive Behavioral Therapy (CBT), one of the most reliable tools for catching and correcting distorted thinking is the thought record. It's a structured way of writing down what happened, what you thought, and how that thought affected your behavior. Therapists have been using it for decades because it works. It externalizes the thought process that normally runs on autopilot, and once a thought is on paper, you can see it clearly enough to evaluate it.

I adapted the standard CBT thought record into something I call a Mental Hand History. Same structure, same mechanism, different language. Poker players need a science-backed system that fits into a post-session review. Five columns, one row per hand or decision that felt off during the session.

Column 1: The Situation. What happened? Just the facts. "3bp BUvSB, facing 3brl ⅓ 75 shove river on J452K. I had 99." No interpretation, no emotion. Just the spot.

Column 2: The Emotion. What were you feeling at the moment of the decision? Be specific. Not "bad" or "tilted." Was it frustration? Anxiety? Boredom? Revenge? Shame? The more specific you are, the more useful this becomes. There's a reason for that: neuroscience research by Lieberman et al. (2007) showed that precise emotion labeling activates the prefrontal cortex and quiets the amygdala, reducing the grip the emotion has on your behavior (Psychological Science, 2007).

Column 3: The Automatic Thought. What was the story running in your head? This is the critical column. The thought is what turned the emotion into a bad decision. Examples: "He's always 3-betting me, I need to fight back." "I've been folding too much, he thinks I'm weak." "If I fold here I'm a nit." "I need to get that money back." Write it down exactly as it occurred to you, even if it sounds irrational on paper. Especially if it sounds irrational on paper.

Column 4: The Cognitive Distortion. What category does the thought fall into? The common ones in poker are:

• Personalization: "He's targeting me" (when the villain is just playing his range).
• Emotional reasoning: "I feel like I'm losing, so I must be playing badly."
• Fortune telling: "I know he's bluffing" (without enough information to justify that certainty).
• All-or-nothing thinking: "This session is already ruined" (after one bad hand).
• Labeling: "I'm a nit" or "I'm a calling station" (reducing yourself to a single trait based on one decision).

You don't need to memorize all the distortions in Beck's original list. These five cover about 80% of what I see in poker sessions, both my own and my clients'.

Column 5: The Reframe. What would you think if you were calm and rested? What if you were reviewing this hand for a friend? This isn't positive thinking. You're not replacing "I'm losing" with "I'm winning inside." You're replacing a distorted thought with an accurate one. "He's always 3-betting me" becomes "He's 3-bet me twice in the last orbit, which is within a normal frequency." "This session is already ruined" becomes "I've lost one buy-in, which is well within my bankroll tolerance."

How this looks in practice

I'll share with you a real entry from my own journal.

Situation: Villain check-raised me on a paired board after I c-bet with air. I folded.

Emotion: Frustration. A sense of being pushed around.

Automatic thought: "Everyone's check-raising me today. I need to start fighting back and floating more."

Distortion: Overgeneralization. One check-raise became "everyone" and "today," which created a narrative of being exploited that didn't match the data.

Reframe: "This is the first check-raise I've faced in the last 20 minutes. His line makes sense on this board. My fold was correct."

That reframe took 30 seconds to go through. And it prevented me from adjusting my strategy based on a feeling rather than on evidence. Without the journal, I would have started floating wider, calling down lighter, and leaking money for the rest of the session based on a narrative my brain invented after a single hand.

That's what C-game looks like in real time. It's rarely one spectacular blowup. It's a series of small adjustments you make in response to thoughts you never examine. And those small adjustments compound over the course of a session, a week, a month, until you're looking at your tracker wondering why your win rate is half of what it should be.

Why reading Tendler isn't enough

If you've read Jared Tendler's The Mental Game of Poker, you know the A-game/B-game/C-game framework. It's a good framework. I reference it with clients and I think the book belongs on every serious player's shelf.

Where the framework stops is implementation. Tendler tells you that your C-game is destroying your results. He gives you a model for understanding why. What he doesn't give you is a structured, repeatable, clinically tested tool for catching C-game thoughts in real time and correcting them before they compound.

CBT records do that. They've been validated across hundreds of clinical trials over decades. James Pennebaker's research on expressive writing showed that structuring your thoughts on paper facilitates cognitive restructuring, the process of recognizing and correcting biased thinking patterns, and that the benefits accumulate with consistent practice (Pennebaker, 1997). The Mental Hand History is the same mechanism applied to poker decisions instead of life stressors.

A framework without a tool is advice. A framework with a tool is a system. Systems produce results.

What most players get wrong about post-session review

The standard post-session review in poker is technical. You open your hand history database, filter for the biggest pots, and look for strategic errors. Did you size your bet correctly? Should you have check-raised instead of calling? Did you choose the right bluffing candidate?

That review matters. Keep doing it. But notice what it misses: the decision that felt slightly off, the one where you knew the right play and did something else. The hand where your read was correct but your execution was driven by frustration or boredom or a need to prove something. Those hands are rarely the biggest pots. They're the medium-sized ones where you lost a quarter or half a buy-in you didn't really have to lose. And because they're not spectacular mistakes, they never make it into your standard review. Even when they do make it into your review, aren't you just looking at the strategy behind them?

The Mental Hand History catches those hands. It doesn't replace your technical review. It runs alongside it, covering the 50% of your leaks that live in your thought patterns rather than your strategy.

The routine

So how do I use this in my own practice? How do I advise clients to use it?

During the session, I tag hands. Most poker software lets you add a note or a tag. Mine doesn't, so I take screenshots. When I make a decision that feels slightly off, or when I notice an emotion spiking, I screenshot the hand. I don't journal during the session. I just mark it so I can find it later.

After the session, I take 20 minutes. I pull up the tagged hands and fill out one Mental Hand History row for each one. Most sessions, that's three to five hands. Some sessions, none. Some sessions, eight. The number itself is useful data.

Once a week, I review the journal entries from that week and look for patterns. Do the same distortions keep showing up? Is there a time of day where my C-game gets worse? A specific opponent type that triggers me? A spot at the table where I consistently think irrationally?

Those patterns are your roadmap. Once you can see them, you can build specific pre-session commitments around them. "When I notice overgeneralization today, I'll pause and check the data before adjusting." That kind of targeted preparation is worth more than another hour studying solver outputs.

Try it for one week

You don't need to commit to anything long-term. Just run the Mental Hand History for seven sessions and see what you find. Most players who do this are surprised by how many C-game decisions they make per session (usually more than they thought), and how few distinct distortions are driving those decisions (usually two or three that repeat over and over).