Chess Risk Score

Opponent risk overlay for Chess.com & Lichess. Win rates, accuracy analysis and account age, all from public data.

♟ CHESS RISK SCORE - Know who you're playing. Chess Risk Score gives you an automatic risk assessment of any opponent on Chess.com and Lichess, right inside the game page - plus optional W/L/D stats and risk scores next to player usernames. ━━━━━━━━━━━━━━━━━━━━━━━━ NEW IN 1.6.0 🧮 New risk formula for Chess.com, tested on 11,298 accounts closed for fair play and 37,807 normal accounts, including 9,814 titled players 🎯 Accuracy is now judged against what is normal for the player's rating, so strong honest players are rarely flagged (Magnus Carlsen: 38 → 7) 🔍 More signals: adds account age, best single-game accuracy and results against opponents' ratings, for a clearer picture of unusual patterns 🏅 No title discount on Chess.com: established titled players score low on their own record, and every account is judged the same way ━━━━━━━━━━━━━━━━━━━━━━━━ HOW IT WORKS When you start, spectate, or review a game, Chess Risk Score automatically: Detects the players in the game Fetches their public stats from the Chess.com or Lichess API Calculates a risk score from 0-100 Displays everything in a clean, draggable overlay Optionally embeds W/L/D stats and risk scores next to usernames on both sides of the board ━━━━━━━━━━━━━━━━━━━━━━━━ WHAT'S MEASURED 📊 Overall Win Rate - All-time win percentage. Win rates above 50% begin contributing to risk. 📈 Recent Win Rate - Last 2 months only. Highlights a recent jump in results compared with a player's all-time record. 🎯 Accuracy Analysis - Accuracy thresholds calibrated per rating band and time format. Flags players consistently performing above the expected accuracy for their rating level. ⏰ Account Age Factor - Accounts under a year old get a risk multiplier. Brand-new accounts (under 7 days) score up to 5x higher. 🏅 Title Factor (Lichess) - Verified GM and IM titles receive reduced risk scores on Lichess. Chess.com needs no discount: the formula judges every player against others of the same rating. 🧩 Behaviour Signals (Chess.com) - Lifetime games played, account age, share of games at 90%+ accuracy and best single-game accuracy (both against what is normal for the rating), results against opponents' ratings, clock left at the end of games, and share of very short games. Their weights come from 11,298 accounts closed for fair play compared with 37,807 normal accounts. ━━━━━━━━━━━━━━━━━━━━━━━━ AT-A-GLANCE RISK CHIPS Small tags surface the biggest drivers of a player's score without reading the breakdown - for example New account, Win streak, Hyper-accurate, High win rate, Few games, 90%+ games, Clock to spare, Short games, and Beating ratings. Toggle them on or off in Settings. ━━━━━━━━━━━━━━━━━━━━━━━━ PLAY YOUR WAY 📋 Normal Mode - Full risk profile shown automatically when a game starts: score, stats, accuracy, insights table, and score breakdown all visible. 🧘 Semi-Zen Mode - Shows only the risk score circle during the game. Expand to the full profile with one click when you want more detail. 🧘 Full Zen Mode - Hides the overlay until the game is over. Data is fetched in the background but stays hidden, so you can play without bias and review afterward. 📊 Embedded Only - Turn off auto-show overlay and enable embedded stats and/or embedded risk score for a minimal, overlay-free experience with stats right next to usernames. 📐 Three sizes - Small, Normal or Large overlay. ━━━━━━━━━━━━━━━━━━━━━━━━ EMBEDDED STATS & RISK SCORE 📌 Embedded Stats - Shows rated W/L/D records next to player usernames on both sides of the board, for the time window you choose. Auto-filters by the current game format (playing blitz = blitz stats only). When the format can't be detected, it uses the format the player has played most in that window. 📌 Embedded Risk Score - Shows the risk score circle next to opponent and self usernames. Works alongside any mode. ⚙ Embedded Settings (cog icon) - Customize your embedded experience: 　- Time interval: 1 hour, 6 hours, 12 hours, 24 hours, 3 days, or 1 week 　- Hide own stats: only show the opponent's stats 　- Color highlighting: toggle green/red/grey W/L/D numbers on or off Changes apply straight away, with no need to wait for the next game. ━━━━━━━━━━━━━━━━━━━━━━━━ FEATURES ✅ Works on Chess.com AND Lichess - overlay and embedded features on both platforms ✅ Works in live games, while spectating, and in game analysis/review ✅ Auto-detects the players when a game starts ✅ At-a-glance risk chips for the top risk drivers (toggle on/off) ✅ Draggable overlay - position it wherever you like ✅ Toggle between opponent and your own stats ✅ Format-specific scoring and embedded stats (bullet, blitz, rapid, daily) ✅ Per-format insights table with W/L/D, accuracy, ratings, and 7-day trends ✅ Embedded W/L/D stats and risk-score circles next to usernames ✅ Configurable time interval, color highlighting, and hide-own-stats for embeds ✅ Semi-Zen and Full Zen modes for distraction-free play ✅ Embedded-only mode - disable overlay, keep inline stats ✅ "How risk is calculated" panel showing the full build-up of the score ✅ Keyboard shortcut (Alt+C) to manually re-run on the current opponent ✅ All analysis happens locally - zero data collection ━━━━━━━━━━━━━━━━━━━━━━━━ RISK LEVELS 🟢 0-24: Low Risk - Normal player patterns 🟡 25-49: Moderate Risk - Some elevated signals 🟠 50-74: High Risk - Multiple concerning indicators 🔴 75-100: Extreme Risk - Strongly unusual patterns ━━━━━━━━━━━━━━━━━━━━━━━━ IMPORTANT DISCLAIMER This extension provides risk indicators, not proof of cheating. A high risk score means unusual patterns worth attention, and most players with a high score are honest. Players deserve the benefit of the doubt. Use this tool responsibly and report suspected cheaters through official Chess.com or Lichess channels. ━━━━━━━━━━━━━━━━━━━━━━━━ PRIVACY No data collection. No tracking. No analytics. All analysis happens in your browser using only publicly available API data. Nothing is loaded from other sites, not even fonts. Recent results are kept for 10 minutes in your browser's own storage so repeat lookups are instant. The code ships unminified, so anyone can inspect exactly what it does. ━━━━━━━━━━━━━━━━━━━━━━━━ Created by az_93