In The Long Run - Poker Mental Game Diary The Series

The 30 Buy-In Rule and Why I Broke It Once

Solid poker bankroll management is the most underrated edge a serious player can have — not because it's complicated, but because it's boring, and boring is hard to maintain. My version is simple: don't move up a stake until I have 30 buy-ins for it, and drop back down the moment I fall to 20. That's the whole rule. It's saved my bankroll more times than I can count.

The math isn't arbitrary. Variance in no-limit hold'em is brutal — even a winning player at NL200 can run 15 buy-ins below expectation over a 50,000-hand stretch. A 30 buy-in floor gives you enough runway to absorb a real downswing without making desperate decisions. Jared Tendler's The Mental Game of Poker anchors bankroll rules to variance tolerance, and 30 buy-ins sits at the conservative end of that range — exactly where I want to be.

I broke the rule once. I had 22 buy-ins for NL200 and moved up anyway. I told myself the sample at NL100 was large enough, that 22 was close enough. Those are all the things a player says when they've already decided and they're building a case. I dropped 8 buy-ins in two weeks and moved back down. The rule wasn't wrong — I was.

What the Rule Actually Protects Against

The 30 buy-in threshold isn't about the math — it's about poker discipline. With 22 buy-ins instead of 30, you feel the money more. You make folds you shouldn't and calls you shouldn't, because your decision-making isn't clean. The rule protects your edge, not just your stack. I track sessions in a journal — I use In The Long Run for mental-game notes — and looking back at that stretch, the tilt patterns are obvious on paper in a way they weren't at the table.

The emotional weight of that downswing is its own story — I covered what twenty buy-ins deep actually feels like in the downswing entry. How I eventually took the NL500 shot the right way is over at the shot-taking entry. This entry is just about the rule: where it came from, why I trust it, and what happens when I don't.

The 30 buy-in rule isn't a suggestion — it's the thing standing between you and a decision you'll regret.

Some players run tighter poker bankroll management — 40 buy-ins, even 50 at higher stakes — and I respect that. Players who think 20 is enough aren't wrong in theory, but they're usually the ones rebuilding six months later. The 30 buy-in standard works because it gives a real winner time to prove it through variance. Bend it once and you'll bend it again.

Frequently Asked Questions

Would you have played it differently if you'd had 25 buy-ins instead of 22?
Honestly, probably not — and that's the point. At 25 I would have found a different justification. The rule has to be a hard number because the human brain is very good at finding reasons to do what it already wants to do. 30 is the line because it's far enough from 'close enough' that you can't talk yourself into it.
Do you think the 30 buy-in rule is too conservative for a proven winner?
Sometimes, yes. But then I remember that two-week stretch at NL200 with 22 buy-ins and the answer gets easier. A proven winner proves it over hundreds of thousands of hands, not a few thousand at a new stake. The rule costs you a few weeks of waiting. Breaking it can cost months of rebuilding.