my ($rating2_2, $rd2_2) = foosball::find_double_rating($dbh, $team2_username2);
# make virtual "team players"
-my $rating_team1 = 0.5 * ($rating1_1 + $rating1_2);
-my $rd_team1 = sqrt($rd1_1 * $rd1_1 + $rd1_2 * $rd1_2) / sqrt(2.0);
-my $rating_team2 = 0.5 * ($rating1_2 + $rating2_2);
-my $rd_team2 = sqrt($rd2_1 * $rd2_1 + $rd2_2 * $rd2_2) / sqrt(2.0);
+my ($rating_team1, $rd_team1) = foosball::combine_ratings($rating1_1, $rd1_1, $rating1_2, $rd1_2);
+my ($rating_team2, $rd_team2) = foosball::combine_ratings($rating2_1, $rd2_1, $rating2_2, $rd2_2);
my $q = $foosball::q;