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.

How does Chess Stalker compare to Chess.com Insights or Aimchess?

Chess.com Insights and Aimchess focus on improving YOUR own chess by analysing YOUR games. Chess Stalker does the opposite: it analyses YOUR OPPONENT to help you prepare specifically against them. The two approaches complement each other.

Can I prepare for an OTB or FIDE tournament with Chess Stalker?

Yes. Chess Stalker has 11M+ FIDE Over-the-Board games indexed and 1.7M+ rated FIDE players searchable by name or ID. You can analyse any FIDE-rated opponent's historical OTB games to prepare for your tournament round.

Can I analyse a player on Chess.com and Lichess at the same time?

Each analysis is for a single platform at a time, but if your opponent has accounts on both Chess.com and Lichess (and you know their usernames), you can run two separate searches and combine the insights.

What kind of weaknesses can Chess Stalker detect?

Opening repertoire weaknesses (which lines they lose most often as White and as Black), tactical patterns (blunder frequency by game phase), time-management issues (how often they flag or play badly under time pressure), and psychological tendencies (tilt patterns, comeback ability, performance against higher-rated opponents).

Can I analyse Magnus Carlsen, Hikaru, or other top players?

Yes. Top players have public profiles on Lichess (DrNykterstein, Hikaru, etc.) and on Chess.com. You can also analyse their FIDE OTB games. Their playing patterns are well-documented in our database.

How accurate is the analysis? How many games does it need?

Analysis quality scales with the number of games available. With 50+ games we generate solid pattern detection; 200+ games produces highly reliable archetype classification and weakness identification. Most active online players have hundreds or thousands of games available.

Can Chess Stalker help me if I'm a chess coach?

Yes. Coaches use Chess Stalker to prepare students for specific opponents, identify recurring opening patterns to teach against, and demonstrate concrete preparation strategy with real game examples. The Twin Bot feature (PRO) lets students practise against an AI replica of their actual opponent.

What's the Twin Bot exactly?

The Twin Bot is a chess engine bot configured to mimic your opponent's opening choices and approximate playing strength. It's NOT a full personality replica, but it lets you practise the openings and structures you're likely to face in your real game. Available in the PRO tier.

Still have questions?

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

Última actualización / Last updated: March 2026