A Lichess opponent scout pulls a player's public Lichess game history and turns it into pre-game prep: their opening tendencies, the lines where they over- and under-perform, a Stalker Score that quantifies how exploitable they are, and a psychology profile that flags tilt and time-trouble patterns. Chess Masti AI does all of this free. Paste any Lichess username; the dashboard renders in seconds.
Opening repertoire tree
Their actual move frequencies as both White and Black, drilled by ECO code. The tree shows what they play, how often, and what they score in each line. Filter by minimum sample size so you don't prep against a fluke.
Repertoire collisions vs. yours
Paste your Lichess username too and the tool finds the lines where you over-perform and they under-perform. These are the lines you should be willing to play if you reach them.
Stalker Score
A 0-100 exploitability index. High Stalker Score means predictable openings, narrow repertoire, time-trouble, or tilt-loss patterns. Low means they're solid across the board and you'll have to outplay them.
Tilt and timeout psychology
How often they lose on time, lose after losing, lose long endgames, win by checkmate vs. resignation. The pattern tells you whether to grind or to complicate.
Novelty / deviation finder
Specific game moments where this opponent deviated from their own book. The deviations are usually mistakes; knowing them gives you concrete prep.
Lichess publishes every rated game. That means every opponent you face online has a public training corpus you can study — except no one studies it because the analysis would take hours per opponent. The scout collapses those hours into seconds.
For arranged matches (team leagues, tournaments, club games) the value is obvious. But even for a quick blitz session, knowing your opponent over-performs in the Sicilian Najdorf and crumbles against the London System changes how you open. Same player, your choice of line, different outcome distribution.
1. Open /scout and paste a Lichess username.
2. Optionally paste your own Lichess username to unlock the repertoire-collision panel.
3. The dashboard renders the opening tree, Stalker Score, tilt profile, and (if you supplied your username) the collision panel. Drill into specific lines to see exact game counts and scores.
4. Share the report. Each scout can be saved as a snapshot and shared as a public link via /share/scout/<id> — useful for prep with a coach or teammate.
Same scout works on Chess.com usernames too — just select "Chess.com" in the platform dropdown. The data pipeline is different (Chess.com's archive API vs. Lichess's database export) but the dashboard is identical.
See the full free AI chess coach
The scout is one piece of the bigger free chess coach pipeline — game analysis with engine-grounded AI explanations, mistake-based puzzles, and follow-up chat. The main page covers the rest.
Open the free AI chess coach pageScout a Lichess opponent free
Paste a username. The dashboard renders in seconds. No login required.