The only thing I know is that whoever has several flights, separated one from other, gets the more pax.
If I've got flights at 6, 10, 14 & 18, and my opponent has flights at 6 & 15, I'll get roughly 2/3rds of the trafic.
If his flights are at 14h45 and 14h50, I'll get 4/5ths of the pax, as its flights are too narrow, and will count only as one.
Note that I made that mistake once. I had 3 flights, 1 at 16h50, one at 11h25, and one at 11h35. Fill rate was 96%, 65% and 65%. Nos that they are at 16h50, 10h45 & 11h40, fill rates are 96%, 92% and 93%. With increased prices.