[hitch1978]

6 teams -

ABCDEF (1 combo, 0 if 1 loser)

5 teams -

ABCDE
ABCDF
ABCEF
ABDEF
ACDEF
BCDEF (6 combos, 5 if 1 loser)

4 teams -

ABCD
ABCE
ABCF
ABDE
ABDF
ABEF
ACDE
ACDF
ACEF
ADEF
BCDE
BCDF
BCEF
BDEF
CDEF (15 combo's, 5 if 1 loser)

3 teams -

ABC
ABD
ABE
ABF
ACD
ACE
ACF
ADE
ADF
AEF
BCD
BCE
BCF
BDE
BDF
BEF
CDE
CDF
CEF
DEF (20 combos, 10 with one loser)

2 teams - Same no' of combos as 4 teams, just pick every combination of 4 teams from above and back the OTHER teams.

I think I may have screwed up, and I'm sure that it is much easier using the math but that might be of some use to you.