CHESS RATINGS
EXPLAINED
Your chess rating is a number that tells the world roughly how strong you are as a player. But there are several rating systems, and they don't all speak the same language. Here's the breakdown.
THE ELO SYSTEM
The ELO rating system (named after physicist Arpad Elo, who designed it in the 1960s) is the foundation of nearly every chess rating system in the world. The core idea is elegant: your rating reflects your expected performance against opponents of known strength.
Beat a stronger player? Your rating goes up more than if you beat a weaker one. Lose to a weaker player? Your rating drops more than if you lost to a stronger one. The system constantly recalibrates based on the gap between expectation and result.
Each game, a certain number of rating points are at stake (the "K-factor"). A new player might have K=40 (big swings while the system figures you out), while a veteran might have K=16 (small, stable adjustments). Win and you gain; lose and you drop; draw and you both move slightly toward each other.
WHAT THE NUMBERS MEAN
Approximate US Chess ranges:
US CHESS vs CHESS.COM
"I'm 1400 on Chess.com — what's my US Chess rating?" The honest answer: we don't know, and it doesn't directly translate.
- Over-the-board, in-person play
- Longer time controls (typically G/30 and up)
- One rating number across all time formats
- Official records kept permanently
- Titles are earned (NM, CM, FM, IM, GM)
- Tighter, more conservative adjustment
- Online, computer-assisted environment
- Separate ratings per time format (Bullet, Blitz, Rapid, Daily)
- Glicko-based system (similar to ELO but different)
- Inflated pool — ratings skew higher on average
- Fun and useful for practice; not officially recognized
- Fast, frequent adjustments
WHAT ABOUT LICHESS?
Lichess uses the Glicko-2 system, which is actually closer to US Chess methodology than Chess.com's implementation. Lichess ratings tend to be closer to US Chess ratings, but still not directly comparable. A 1500 Lichess Classical player is in the right ballpark of a 1300–1500 US Chess player, but individual variation is huge. Again — the only definitive answer is to play rated games.
BLUNDERCHECK CLUB RATING
The Blundercheck Club ELO is our own internal rating used exclusively for the Weekly Club Challenge. It uses ELO math, but it exists completely in its own bubble.
Your Blundercheck Club Rating has absolutely no connection to your US Chess rating, your Chess.com rating, your Lichess rating, or any other official rating system. It reflects only your performance in Club Challenge matches at our Monday sessions. It is a measure of your standing within our club — nothing more, nothing less.
Think of it as a leaderboard for our little weekly competition. It's competitive, it's tracked, and it's fun — but don't read too much into the number. A 1600 Club Rating here tells you that player is near the top of our club ladder, not that they're a 1600 US Chess player.
Want to earn an official US Chess rating? Play in our rated events. The Blundercheck Grand Prix is a US Chess rated event series.