Read the text buffer 
i dunno too much bout H2H, but i BELIEVE, (assuming my 1st grade teacher was at all qualified in the field of additational mathematics), that there are only 4 players in-game. 3 talkin in text buffer, and including gatsu, that makes 4.
The equation as I understand it, meager as my talents may be, is the numeral 1 pluss(+) one(1), pluss(+) one(1), pluss(+) one(1), equals(=) four(4).
but again, idk how many players are allowed in Head To Head.