He knows its none of his usual passwords as its a secure one generated on http://strongpasswordgenerator.com/ and could be up to 15 character long.
Can he remember past of the password, or he has completely no idea what the password is?
If it is the latter case, I don't think it can be brute forced for a 15-character long password...
He thinks it starts with X0
FYR: https://bitcointalksearch.org/topic/m.4401257
If we are talking about 13 unknown characters in the password, your only bet is to restore the keypass files.
Thanks for the link.
He believes it is more like 8 - 10 characters long. he said it wasn't very big.
If it is 6-8 unknown characters (with 2 known), it is possible to brute force the password.
Good luck
