US Chess Certifies ChessNoteR Nexus 6 and Nexus 9 v2.2.2 https://new.uschess.org/news/us-chess-certifies-chessnoter-nexus-6-and-nexus-9 Certificationhttps://new.uschess.org/sites/default/files/media/documents/chessnoter-n6-n9_approval2july2019.pdf
