---
title: "Rating sync"
description: "Rating sync copies a student's public online ratings from a linked Lichess or Chess.com account into their academy record. In ChessCore, each sync stores the account's blitz, rapid, bullet and classical ratings and, when the value has changed, adds a labelled rating snapshot to the student's history, so coaches read a trend without retyping numbers."
canonical: "https://chesscore.io/glossary/rating-sync"
author: "Abhishek Tiwari"
datePublished: "2026-07-20"
dateModified: "2026-10-16"
---

Written by Abhishek Tiwari. Drafted with AI, fact-checked and approved by a human before publishing. Editorial standards: https://chesscore.io/editorial

## Rating sync

Rating sync copies a student's public online ratings from a linked Lichess or Chess.com account into their academy record. In ChessCore, each sync stores the account's blitz, rapid, bullet and classical ratings and, when the value has changed, adds a labelled rating snapshot to the student's history, so coaches read a trend without retyping numbers.

## Context

Rating sync is separate from game import, though both run when a linked account syncs. Importing brings in public games; the rating fields hold the account's blitz, rapid, bullet and classical ratings, and Chess.com's daily rating is stored in the classical slot because Chess.com has no classical rating. Each sync can add one snapshot to the history, chosen from rapid first, then blitz, bullet and classical, and Lichess snapshots also carry a rating deviation. Both integrations are read-only, and both can sync automatically; those describe different properties, not opposites. Automatic sync starts on the Pro plan and up. Keep the source and time control beside every number, because Lichess and Chess.com rate players in separate pools and Lichess says ratings cannot be compared directly between servers. If a student changes username or platform, keep each source and time control separate and treat any estimated conversion as approximate, never as an official or FIDE rating. Unlinking a username stops future syncs, and the games already imported stay in the student record.

## Read next

- [The full guide](https://chesscore.io/blog/lichess-vs-chesscom-for-academies)

## Related terms

- https://chesscore.io/glossary/game-review-queue
- https://chesscore.io/glossary/progress-report
- https://chesscore.io/glossary/parent-update

## Sources

1. [Lichess.org API docs (open API for ratings and game history)](https://lichess.org/api), lichess.org, accessed 2026-10-16
2. [Chess rating systems, Lichess](https://lichess.org/page/rating-systems), lichess.org, accessed 2026-10-16
3. [How do ratings work on Chess.com?, Chess.com Help Center](https://support.chess.com/en/articles/8566476-how-do-ratings-work-on-chess-com), support.chess.com, accessed 2026-10-16