I've commited plenty of enhancements/fixes over the last days. certabo-uci.py did also receive a lot of testing. Not only with lichess-bot and pychess. I've also done plenty of testing with SCID vs PC, jcchess and Arena for Linux (3.9 beta). This was helpful to identify flaws in my UCI handling (e.g. neither lichess-bot nor pychess do send a 'position fen ' but just startpos). Also wanted to try Shredder 5 Classic demo, but that apparently doesn't have an engine tournament mode.