1. e4
Discover their common moves
YOUR ACCOUNTS, TOGETHER
Your Chess.com and Lichess games.
Together.
Connect multiple Chess.com and Lichess accounts. See your combined results and use AI explanations to understand what to improve.
More than one account on the same platform? Add each one. See how it works ↓
ACROSS THE CHESS COMMUNITYRECORDED GAMES
Millions of moves.
Brought together.
♞ Chess.com♘ Lichess
Player accountsPublic game history
Recorded gamesMoves and results
Player accountsPublic game history
Recorded gamesMoves and results
ChessSum
The ChessSum collection
—recorded games, in one place
—Accounts tracked
—Platforms
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Use Refresh to check for updated collection statistics.
TODAY AT THE BOARD
—games played today
From imported games · UTC
Explore playing activityPLAYER OF THE WEEK
Finding this week’s front-runners…
Explore the rankingsMost wins · Both platforms · UTC weekA MOMENT ON THE BOARD
Finding a game to explore…
RECENTLY ADDED
All players Free during Early Access
Know your opponent before the first move.
Explore a player’s openings, results and recurring mistakes. Save the report, study their games and share the analysis.
Online accounts or your tournament PGNs. How it works →ILLUSTRATION · not a real player's reportTHEIR OPENINGS THEIR RESULTS PLAYER REPORT
W · D · L
See results in each opening
A clearer picture.
Review their common openings.
Explore the evidence.
Practice before you play.
MORE CHESS TO DISCOVER
Explore ChessSum
Explore players, replay games and find your next chess community. Your own accounts always stay together in your workspace.
SOMETHING NEW TO EXPLORE
Discover ChessSum.
Gathering public discoveries…
A wider view of your game.
Players, recorded games and community listings.
YOUR NEXT MOVE, NEAR YOU
Find chess in your neighborhood.
Schools, clubs and events. A place to learn. People to play.
♜ Schools · ♞ Clubs · ♟ Events · Location is requested only when you choose Near me and is not saved.
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CONNECTED ACCOUNTS. CLEARER NEXT STEPS.
From your games to your next lesson.
- 01
Connect
Bring your Chess.com and Lichess accounts into one view.
- 02
Analyze
A dedicated chess engine checks your games for missed opportunities and recurring mistakes.
- 03
Understand
Ask AI to explain the findings in your saved report in plain language.
- 04
Practice
Follow recommendations to prepared lessons and hands-on board practice.
AI coaching · illustrative example
An early attack. An exposed king.
Sample advice to show the experience — not an analysis of your games or a generated report.
The pattern: Imagine 4 of your last 10 games involved an attack before your king was safe.
What to work on: Develop your pieces and look for a safe chance to castle before starting an attack. Check your opponent’s threats first.
Your next lesson: Explore development and king safety in the Italian Game, then try the moves on the board.
A dedicated chess engine evaluates moves. AI explains report findings. Lessons are prepared learning material; statistics and account syncing do not use generative AI. Analysis allowances depend on your plan.
THE PEOPLE BEHIND THE MOVES
A little friendly competition.
More games. More wins. More ways to make your mark.
Preparing the weekly and monthly standings…
THIS MONTH
Ranking leaders
Top 3 in the rankings
These are the ranking leaders. Use Compare to build your own selection below.
Loading rankings…
Showing three leading accounts; ties share a rank. Win-rate rankings require 20 games. Activity points = games + 2 × wins + draws; they measure participation. Playing streaks count consecutive UTC days within the selected period. Card mini-charts show the last seven days.
Explore all leaderboard positionsMost active
No eligible results in this period yet.
Top winners
No eligible results in this period yet.
Best win rates
No eligible results in this period yet.
Longest streaks
No eligible results in this period yet.
Rankings cover eligible public accounts indexed by ChessSum. Full history, a successful update within 14 days, and no active import are required. Source-account entries can be added by any visitor. About the data →
DIFFERENT BOARDS. SAME PASSION.
Standouts on every platform.
Current chess ratings stay on their own platform and time-control scales.
Chess.com
blitzHighest current ratings
No eligible results in this period yet.
Most games · This month
No eligible results in this period yet.
Most wins · This month
No eligible results in this period yet.
Ratings are current snapshots. Activity and wins use this month. Some time controls may have no tracked ratings.
Lichess
blitzHighest current ratings
No eligible results in this period yet.
Most games · This month
No eligible results in this period yet.
Most wins · This month
No eligible results in this period yet.
Ratings are current snapshots. Activity and wins use this month. Some time controls may have no tracked ratings.
PUBLIC PLAYER ACTIVITY
Games played by day.
See busy days and quiet periods across the public accounts tracked by ChessSum.
All tracked accounts · Chess.com + Lichess · All time controlsSee your own games
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A MOMENT ON THE BOARD
Watch the story unfold.
A recently recorded game from the public directory. Follow every move, see the next move’s arrow, and take it at your own pace.
The first replay will appear when a game with recorded moves is imported.
MORE STORIES TO DISCOVER
New to the directory.
Public player accounts added by visitors and members alike.
Who’s making more moves?
Select 2–10 accounts from the player cards to compare their games, wins, losses and win rate over the same period.
0 / 10 players selected � This monthChoose 2 more players to compare.
PROGRESS THROUGH PRACTICE
Learning leaders
Celebrate completed practice, steady learning and accurate recall.
Loading learning rankings…
Voluntary public rankings of ChessSum members. Lessons count once, at first completion. Repeating a lesson earns no extra completion. Shared-check scores use the same 20 positions, with the first unhinted completed check in the period determining the score. Improved recall requires at least seven days and separated 95% rate intervals. Ties share a rank. Periods use UTC.