Chess Stalker
Frequently asked

Answers before you sit down to play

Where the data comes from, what the Stalker Score measures, what the free plan covers — and what it cannot do.

The basics

What is Chess Stalker?

Chess Stalker is a chess analysis tool that helps you prepare for games against specific opponents. We analyze the playing style, weaknesses, favorite 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:

Lichessvia its official public API.
Chess.comvia its official public API.
FIDEa database with over 13 million OTB games from official tournaments and over 1.8 million FIDE-rated players. All games are obtained from freely available sources or through our own agreements with several chess federations.
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 analyzing opening consistency, tactical tendencies and error patterns.

How many archetypes are there?26

We have defined 26 archetypes describing different playing styles:

The Time ScramblerPoor clock management. Play complex positions that require calculation.
The SpeedsterPlays very fast, sometimes without thinking. Surprise them with unusual lines.
The Clock MasterExcellent time management. Focus on quality, not waiting for time-pressure mistakes.
The TilterEmotions affect their game. Make them nervous and they may fall apart.
The HotheadPlays worse after losing. Win the first game and press hard.
The Ice ManNerves of steel. You will need very solid preparation.
The PhoenixBounces back stronger after losses. Be careful if you beat them.
The ResilientRecovers quickly from bad streaks. Do not get complacent.
The GentlemanKnows when to resign. Do not waste time waiting for errors in winning endgames.
The SurvivorFights until the last second. Stay focused all the way to checkmate.
The Never-ResignerNever resigns. Be ready for long games.
The StreakerProne to losing streaks. Win one and keep the psychological pressure on.
The ConsistentRarely loses several in a row. Do not expect a collapse.
The DominatorHigh win percentage. Analyze their specific weaknesses.
The WinnerUsed to winning. They may get frustrated if you challenge them from move one.
The UnderdogPerforms better against higher-rated opponents. Do not underestimate them.
The BerserkerUltra-aggressive style. Play solid and let them crash against your defense.
The AttackerPrefers active positions. Take control with quiet openings.
The FortressVery solid defensive player. You will need patience.
The MachineConsistent and methodical. Surprise them with creative ideas.
The Comeback KidDangerous when losing. Do not ease the pressure when you are ahead.
The ProfessionalPlays with class and good judgment. Prepare the opening well.
The Clutch PlayerPerforms especially well under pressure. They will stay calm in critical moments.
The Stubborn MuleRefuses to resign even when tilted. Close out the games.
The Rubber BandBounces back quickly from bad streaks. Do not assume they will keep losing.
The Solid PlayerConsistent 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.

Plans

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.
Behavioral analysis and psychological profile.
Practical recommendations to prepare your game.
Twin Bot against online opponents (Lichess and Chess.com).
What does PRO add?
Full Legends Gallerythe style of 52 historical grandmasters (15 of them open in the free version).
Head-to-Headcompare two players face to face.
Nemesisdiscover any player's biggest rival and favorite victim.
Endgame statisticsconversion, resilience and performance by endgame type.
Studio (a prep workspace with several boards, the master book, Maia and Stockfish, saved studies) and advanced repertoire filters (time control, year and tournament).
Twin Bot against FIDE/OTB opponents (against online opponents it is free).
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 analyzing YOUR games. Chess Stalker does the opposite: it analyzes YOUR OPPONENT to help you prepare specifically against them. The two approaches complement each other.

Using it

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

Yes. Chess Stalker has 13M+ FIDE Over-the-Board games indexed and 1.8M+ rated FIDE players searchable by name or ID. You can analyze any FIDE-rated opponent's historical OTB games to prepare for your tournament round.

Can I analyze 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 analyze 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 analyze 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 lets students practice against a bot that imitates their actual opponent (free against online opponents; FIDE/OTB opponents require PRO).

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 practice the openings and structures you're likely to face in your real game. Free against online opponents (Lichess and Chess.com); against FIDE/OTB opponents it is part of the PRO plan.

EnginePowered by Maia neural networks

Still have questions?

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info@chessstalker.com

Last updated August 2026

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