How to scout a chess opponent's openings before a game

By [Your name] · June 8, 2026

The pairings go up the night before the round. You know your opponent's name and rating, and not much else. You have one evening. What's the highest-value thing you can do with it?

Not cramming new theory. Scouting. An hour spent learning what this specific person actually plays beats three hours of generic study, because preparation only pays off if it appears on the board — and the only openings that appear on the board are the ones your opponent chooses to play.

Here's a repeatable way to do it.

1. Gather their games

You need a sample of their past games in PGN. The usual sources:

Their online profiles (most club players have a Lichess or Chess.com account under a recognizable handle).
Tournament databases and federation game archives for over-the-board events.
Any PGN a teammate or the player themselves has shared.

Twenty to fifty games is plenty to see patterns. You're not after completeness; you're after tendencies.

2. Split by colour and find the first decision

Scout White and Black separately — they're effectively two different opponents. For each, walk back to the first real branching point. Against 1.e4, do they meet it with the Sicilian, the Caro-Kann, 1...e5? When they have White, is it a fixed 1.d4 system, or do they mix?

What you're building is a small tree: their most common first few moves, weighted by how often they actually play each one. The fattest branches are where your preparation will land.

3. Score the branches — frequency and results

Frequency tells you what's likely. Results tell you where they're comfortable. A line they play 40% of the time but score 30% in is a very different target from one they play 40% of the time and win with. You're looking for two things:

Their main weapons — the lines you're most likely to face, so you're not surprised.
Their soft spots — lines where the results sag, where they reach a structure they clearly don't enjoy, or where they have no consistent answer to a particular setup.

4. Find the positions they keep reaching

Openings are move orders; what actually matters is the position the move order produces. Map the recurring middlegame structures your opponent steers toward — the pawn skeletons, the piece setups they trust. If three different move orders all funnel them into the same isolated-queen-pawn position, that position is their repertoire, and it's what you should prepare against.

5. Decide your plan, then stop

Scouting fails when it becomes doom-scrolling through games at midnight. Convert what you found into one or two concrete decisions: "I'll meet their Sicilian with the line that steers into the structure their results are worst in," or "they have no consistent answer to an early c4 — I'll play it." Write the decision down. Sleep.

Doing this in minutes instead of an evening

The manual version above works, but it's a lot of clicking through games and counting by hand. This is exactly what Scout in FlexiChess automates: paste a player's games (or name a player already in the database) and it maps their opening tendencies, scores each line by frequency and result, surfaces the key positions they keep reaching, and flags the gaps where they have no prepared answer. What took an evening takes a few minutes — and because the position search runs across 10.3M+ master games, you can immediately see how strong players handle the structures your opponent likes, so you arrive with a plan instead of a hunch.

It's the kind of preparation that used to require a desktop database and a paid subscription. It now runs in a browser tab.

Try it: Scout your next opponent free in FlexiChess — paste their games, no account needed. Open Scout →