use of has/have
I'm not a native English speaker and I have a problem with the use of has/have in following context. As far as I know has is used when the subject is singular and have is used when subject is plural, but recently I came across the following sentence,
He might have potentially played more games at home.
why have is used here when the subject (he) is singular?
Re: use of has/have
The verb "might" is followed by an infinitive. Have a look here http://www.perfectyourenglish.com/grammar/might.htm.
I am not a teacher.