FAQ

What is Chess Stalker?

Chess Stalker is a chess analysis tool that helps you prepare games against specific opponents. We analyse the playing style, weaknesses, favourite openings and error patterns of any player on Lichess, Chess.com or with a FIDE rating.

Where does the data come from?

We obtain data from three main sources:

• Lichess: via its official public API.
• Chess.com: via its official public API.
• FIDE: a database with over 11 million OTB games from official tournaments and over 1.7 million FIDE-rated players.

What is the Stalker Score?

The Stalker Score is our proprietary metric measuring how predictable a player is. A high score means the player has very defined patterns you can exploit in your preparation. It is calculated by analysing opening consistency, tactical tendencies and error patterns.

How many archetypes are there?

We have defined 26 archetypes describing different playing styles:

• The Time Scrambler: Poor clock management. Play complex positions that require calculation.
• The Speedster: Plays very fast, sometimes without thinking. Surprise them with unusual lines.
• The Clock Master: Excellent time management. Focus on quality, not waiting for time-pressure mistakes.
• The Tilter: Emotions affect their game. Make them nervous and they may fall apart.
• The Hothead: Plays worse after losing. Win the first game and press hard.
• The Ice Man: Steel mental fortitude. You will need very solid preparation.
• The Phoenix: Bounces back stronger after losses. Be careful if you beat them.
• The Resilient: Recovers quickly from bad streaks. Do not get complacent.
• The Gentleman: Knows when to resign. Do not waste time waiting for errors in winning endgames.
• The Survivor: Fights until the last second. Stay focused all the way to checkmate.
• The Never-Resigner: Never resigns. Be ready for long games.
• The Streaker: Prone to losing streaks. Win one and keep the psychological pressure on.
• The Consistent: Rarely loses several in a row. Do not expect a collapse.
• The Dominator: High win percentage. Analyse their specific weaknesses.
• The Winner: Used to winning. They may get frustrated if you challenge them from move one.
• The Underdog: Performs better against higher-rated opponents. Do not underestimate them.
• The Berserker: Ultra-aggressive style. Play solid and let them crash against your defence.
• The Attacker: Prefers active positions. Take control with quiet openings.
• The Fortress: Very solid defensive player. You will need patience.
• The Machine: Consistent and methodical. Surprise them with creative ideas.
• The Comeback Kid: Dangerous when losing. Do not ease the pressure when you are ahead.
• The Professional: Plays with class and good judgement. Prepare the opening well.
• The Clutch Player: Performs especially well under pressure. They will stay calm in critical moments.
• The Stubborn Mule: Refuses to resign even when tilted. Close out the games.
• The Rubber Band: Bounces back quickly from bad streaks. Do not assume they will keep losing.
• The Solid Player: Consistent and predictable. Unbalance the position to take them out of their comfort zone.

How often is the data updated?

Lichess and Chess.com data is fetched in real time each time you run an analysis. FIDE data is updated regularly with the latest official tournament games.

Do you store my personal data?

We only store data strictly necessary for the service (email address for registered accounts and subscription data). We do not store search histories linked to your identity. See our Privacy Policy for full details.

What does the free version include?

• Player search on Lichess, Chess.com and FIDE.
• Full scouting report with Stalker Score and archetype.
• Opening repertoire analysis.
• Exploitable weakness detection.
• Aggregate performance statistics.
• Behavioural analysis and psychological profile.
• Practical recommendations to prepare your game.

What does PRO add?

• Legends Gallery: analyse the style of 54 historical grandmasters.
• Head-to-Head: compare two players face to face.
• Nemesis: discover any player's biggest rival and favourite victim.
• Twin Bot: play against a bot that exactly replicates your opponent's style.
• Unlimited PGN downloads.

Still have questions?

Email us at info@chessstalker.com or use the contact form in the footer.

Última actualización / Last updated: March 2026