During October 2025, mathematicscpu focused on targeted code quality improvements across the lichess-org/scalachess and lichess-org/lila-ws repositories. Working primarily in Scala, they refactored the Horde variant’s insufficient material check in scalachess, removing a redundant bishop-and-pawn condition to streamline chess logic and reduce potential for future regressions. In lila-ws, they eliminated an unused ThroughStudyDoor case class from model.scala, addressing technical debt and clarifying code paths. These changes, while not user-facing, enhanced maintainability and readability, supporting smoother future development. Their work demonstrated a strong emphasis on clean code, code refactoring, and game development best practices within established codebases.