During October 2025, mathematicscpu focused on targeted code quality improvements across the lichess-org/scalachess and lichess-org/lila-ws repositories. They refactored Scala code to remove a duplicate bishop-and-pawn condition in the Horde variant’s insufficient material check, streamlining chess logic and reducing the risk of future regressions. In lila-ws, they eliminated an unused ThroughStudyDoor case class, cleaning up dead code and enhancing maintainability. These changes, achieved through careful code refactoring and adherence to clean code principles, did not alter user-facing functionality but reduced technical debt, clarified code paths, and laid groundwork for safer, more efficient future development and onboarding.