If you have forgotten your username or password, you can request to have your username emailed to you and to reset your password. When you fill in your registered email address, you will be sent instructions on how to reset your password.
74 players confirmed to play Knockout 9 (K9)...
Considering K9 is an online contest, please see this post on MAME forum. There are 74 confirmed players so far!
Metroid Team, from Brazil