How to Take Notes on Opponents in Poker (and Actually Use Them)

Most players take notes on opponents the way they make new year’s resolutions: with enthusiasm for about a week, then never again. The notes that do get written are usually useless, things like “fish” or “bad player,” which tell you nothing the next time you sit down with them.

Good opponent notes are one of the most underused edges in poker, especially in player pools you see repeatedly. Here is how to take notes that are actually worth reading later, and how to turn them into decisions at the table.

Why bother

Poker is a game of incomplete information, and every reliable read you have on a specific opponent is information your competitors do not have. Over a year of sessions against the same regular pool, the player who remembers that Villain X always check-raises the turn with air, and never with a made hand, is printing money against him while everyone else guesses.

Your reads are your edge. The problem is human memory: you cannot hold accurate, specific reads on dozens of opponents across months. So you have to write them down, and you have to write them down well.

What to actually write

The difference between a useless note and a great one is specificity and context. “Aggressive” is useless. “3-bets light from the button vs my steals, but folds to 4-bet” is gold. Aim for notes that describe a concrete action in a concrete spot.

A few categories worth capturing:

Tendencies with a spot. Not “calls too much,” but “calls down with second pair on scary boards.” The spot is what makes it actionable.
Showdowns. The single most valuable note source. When you see a player’s cards at showdown, you have confirmed information. Write what they did and what they had: “limp-called UTG with KQo, then stacked off top pair.” Showdowns turn guesses into data.
Bet-sizing tells. Many players size differently with value and bluffs. “Goes big on the river only when bluffing” is a license to print.
Tilt profile. How does this player react to a bad beat? Some open right up. “Spews for 20 minutes after losing a big pot” tells you when to widen against them.
Style tag, lightly. A quick TAG / LAG / nit / calling-station label is a useful headline, but only if backed by the specific notes underneath.

Avoid the trap of writing emotional notes (“idiot, got so lucky”). Those feel good to type and tell future-you nothing.

How to organize reads

A pile of notes you cannot find mid-hand is not useful. Some structure principles:

Make them scannable. When that player sits down, you want the key read in two seconds, not a paragraph to parse while the action is on you.
Lead with the headline. Put the single most exploitable tendency first, then supporting detail below.
Update, do not just append. Players evolve and your early reads may be wrong. A note from six months ago that says “super tight” might be stale. Revisit and correct.
Tag by where you play them. Live notes and online notes on the “same” player can diverge; keep the context.

Turning notes into decisions

Notes are worthless if you do not act on them. The discipline is to actually pull up the read before you make a marginal decision against a known player, and let it break the tie. If your note says “only bets big on the river when bluffing” and he just bet big, that is your cue to look him up even when your hand looks marginal.

The reads also compound into psychological profiles. Once you have enough specific notes on a regular, you start to understand not just what they do but why, and that lets you predict them in spots you have never seen them in.

Where the work gets easier

The honest reason most players do not keep good notes is friction: it is tedious to write structured notes in the middle of a session, and even more tedious to organize and review them later. That friction is exactly what OctoCoach is built to remove.

You build villain profiles with your reads and notes, tag styles, and let the AI assemble psychological profiles of your regular opponents from the data you have logged. Table Scout gives you a fast read on who is at your table before and during a session. And because your reads are your edge, opponent data is pseudonymized before it ever reaches the AI, so your information stays yours.

The notes are not glamorous, but they are one of the few edges that only get stronger the longer you play a pool. Write them well, keep them organized, and actually pull them up when it counts.

OctoCoach keeps your opponent reads organized and turns them into psychological profiles, privately. Start free, 7 days, no credit card. Related: the mental game of poker, a practical guide.