An IF bet is more for money management.
If I like quite a few games, I will put the game that starts last of the games I like at the beginning. Basically if they win, then you go to the 2nd bet, then the 3rd, 4th and so on.
Not always the best way, but you could potentially go like 1-4 and be in a big hole.
The 2nd bet in the sequence is my strongest play of an earlier game. Today it will be Orioles +1.5 / Cards +1.5...then a 3rd straight wager.
My 1st bet, if 5Dimes will ever work today, is a pretty safe one...Parlay: SF -1 / Nats +1.5