Free Chess Opponent Prep & Ghost Bot Match Simulator
Opponent Prep is a free, instant online chess preparation and scouting engine for Chess.com and Lichess. By analyzing any player's recent public games, Opponent Prep extracts their entire opening repertoire, move frequencies, win rates, and tactical blunder patterns — transforming raw game history into an interactive AI Ghost Bot that plays exactly like your target opponent.
Whether preparing for an over-the-board (OTB) club match, a Swiss tournament round, an online league game, or a competitive rivalry on Chess.com or Lichess, Opponent Prep gives you an unfair advantage. Study your rival's main lines as White and Black, uncover hidden move-order tricks, identify positions where they historically blunder under pressure, and rehearse your exact counter-preparation against an AI bot tuned to their playing style.
During practice duels, Coach Moji provides real-time position coaching and triggers automated 'Bomba' alerts whenever you reach a board state where your opponent previously suffered tactical failures. Train in Full Game mode or isolate the opening phase (up to 12-15 moves) to master your preparation with zero account setup or daily search limits.
Comprehensive Scouting & Ghost Bot Preparation Features
Opening Repertoire Profiling
Inspect complete opening trees as White and Black with win/draw/loss percentages, main line preferences, and move frequency probabilities down to specific sub-variations.
AI Ghost Bot Simulation
Spar directly against a customized AI bot programmed with your opponent's weighted move-decision tree, tactical tendencies, and Stockfish-calibrated playing strength.
Tactical Blunder & Pattern Identification
Automatically discover recurring tactical weaknesses, missed opportunities, and endgame mistakes your opponent repeatedly makes across past matches.
Dedicated Opening Phase Sparring
Isolate the first 12–15 moves of any opening line to repeatedly test and memorize your prep against your opponent's favorite variations before stepping into real competition.
Coach Moji Real-Time & Bomba Alerts
Receive live positional guidance from Coach Moji and automatic 'Bomba' alerts when your opponent's Ghost Bot enters a line where the human player historically blundered.
Cross-Platform Chess.com & Lichess Support
Seamlessly fetch and parse public games from both Chess.com and Lichess using 25, 50, 100, 200, or a custom game sample size across Blitz, Rapid, and Classical time controls.
Over-the-Board (OTB) & Tournament Readiness
Simulate upcoming tournament opponents, prepare sharp opening novelties, and build confidence before club matches or FIDE-rated events.
100% Free & Browser-Based Engine
Opponent Prep runs client-side in your browser powered by Stockfish. No sign-up, credit card, or software installation is required.
How to Scout an Opponent & Train Against Their Ghost Bot
Step 1: Enter Username & Choose Platform
Type any valid Chess.com or Lichess player handle into the search bar and select the target platform and desired game count (from 25 up to custom N games).
Step 2: Automated Game Mining & Repertoire Extraction
Opponent Prep fetches past public games and analyzes opening choices, win rates, move frequencies, and tactical blunder points.
Step 3: Review Repertoire Breakdown & Blunder Map
Examine your opponent's opening tree, discover their highest and lowest scoring lines as White and Black, and identify key tactical weaknesses.
Step 4: Launch Practice Match vs. Ghost Bot
Select Full Game or Opening Only mode, choose White or Black, and spar against the Ghost Bot with real-time Coach Moji hints and Bomba alerts.
Frequently Asked Questions About Opponent Prep
What is Opponent Prep and how does it create a Ghost Bot?
Opponent Prep is an AI-powered chess scouting tool that downloads an opponent's public game history from Chess.com or Lichess. It constructs a weighted move-decision tree of their opening repertoire and calibrates an AI Ghost Bot that plays their exact move variations and playing style.
Is Opponent Prep completely free to use?
Yes! Opponent Prep is 100% free with no hidden fees, subscriptions, or daily search caps. Analysis and bot simulation run in your browser.
Can I scout opponents from both Chess.com and Lichess?
Yes, Opponent Prep supports fetching public game data from both Chess.com and Lichess. You can switch between platforms instantly with one click.
How many games should I analyze for accurate opponent scouting?
Analyzing 25 to 50 recent games is ideal for rapid scouting of current opening preferences. For a deep structural preparation across multiple time controls, analyzing 100 to 200 games provides a comprehensive move tree.
What is the difference between Full Game and Opening Only practice modes?
Opening Only mode focuses strictly on the first 12–15 moves, allowing you to repeatedly rehearse your prep against your opponent's main lines. Full Game mode transitions into complete game play with Stockfish after the opening phase.
How do Coach Moji Bomba alerts help in practice matches?
During sparring games against the Ghost Bot, Coach Moji triggers a 'Bomba' alert when the board reaches a position where your real opponent historically made blunders or tactical errors in past games.
Can I use Opponent Prep for OTB tournament preparation?
Absolutely! Opponent Prep is widely used by tournament players and club members to scout opponents before round-robin or Swiss events, allowing players to test novelties against their opponent's preferred lines beforehand.
Is Opponent Prep legal for online chess match preparation?
Yes. Opponent Prep uses publicly available game archives provided by Chess.com and Lichess APIs for offline/pre-game preparation and sparring, fully adhering to fair play guidelines.