A round robin parlay consists if all possible combos (there are variations).
For example, my parlay looks like this (1 four teamer, 4 three teamers, and 6 two teamers). Some software allow you to select partial RR's (only the 2's, for example)
1. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
2. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
3. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
4. 1. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
2. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
5. 1. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
2. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
6. 1. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
2. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
7. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
3. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
8. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
3. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
9. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
3. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
10. 1. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
2. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
3. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start
11. 1. 29-Aug-06 Baseball/MLB (Money) Milwaukee Brewers vs Houston Astros for Game (-198) Pending
T. Ohka must start / R. Oswalt must start
2. 29-Aug-06 Baseball/MLB (Money) New York Mets vs Colorado Rockies for Game (-120) Pending
S. Trachsel must start / B. H. Kim must start
3. 29-Aug-06 Baseball/MLB (Money) Tampa Bay Devil Rays vs Chicago White Sox for Game (-207) Pending
C. Fossum must start / F. Garcia must start
4. 29-Aug-06 Baseball/MLB (Money) Kansas City Royals vs Minnesota Twins for Game (-183) Pending
M. Redman must start / M. Garza must start