VulCode

Lichess: our changes to an open source project

The lichess.org chess server: free, ad-free and open source, focused on real-time play. The back end is written in Scala, the interface in TypeScript.

All contributions
Language
TypeScript
GitHub stars
18,893
Project site
lichess.org
1merged change
Merged on 19 October 2026.
Number 12 of the 70 GitHub projects with our changes, by stars. First is Zed (92,183).

The change merged into Lichess

The end-of-game result mark goes on another piece when a side finishes without a king, as in antichess and in horde for white: the queen, rook, bishop, knight or pawn, in that order. It also shows in antichess games with two kings after a promotion, where it did not appear at all before.

What it taught us

Code that assumes every side has exactly one king breaks in variants that break that rule. Rather than look for one piece, it is better to walk a list of pieces in a fixed order and take the first one on the board.

TypeScript, React and Node

Our projects in this technology, their screens and when we choose it.

Other projects with our changes: TypeScript, React and Node

6 projects in this technology have our merged changes. The bar is the repository's stars, next to it the number of our changes. Each row leads to the project's page.

TypeScript, React and Node

Lichess among all our changes

Day by day from the first merged change, on 5 September 2026. A column is every change merged that day, the accent is the changes in Lichess.

  • Changes in Lichess
  • Changes in other projects

1 merged change in Lichess

Merged on 19 October 2026.

On the same day

No other project merged a change of ours that day.

The whole period

147 merged changes in 71 projects.

Questions about our changes to Lichess

Where these changes come from, who merged them and whether we can fix something in your library.

Using Lichess in your project?

If something in it does not work, we fix it at the source and leave a workaround until the release. We reply within an hour.