its where you play parlay combos of different teams . like
say you have 4 teams and you want to do a round robin by 2's
that means you will have 6 2team parlays and if you want to bet 10 on them it would be 60$
team a,b,c,d
a/b a/c a/d
b/c b/d
c/d
you can do them with 3-8 teams and break them down into 2,3,or4 team parlays.
its a way of playing without putting up to much money. hard to win allot this way but a little safer then 1 parlay