"Chessmaster 9000 Defeats Reigning US Chess Champion Larry Christiansen; Chessmaster Wins Four Game Match 2.5 to 1.5 Via Live Internet Broadcast on ChessClub.com".
Truy cập ngày 14 tháng 9 năm 2009.  ^ “Chessmaster 9000 Defeats Reigning US Chess Champion Larry Christiansen; Chessmaster Wins Four Game Match 2.5 to 1.5 Via Live Internet Broadcast on ChessClub.com”.