This might help:
http://support.chess.com/index.php?_m=knowledgebase&_a=view&parentcategoryid=81&pcid=0&nav=0
There is tournament help but it is outdated, not addressing the number of simultaneous games per opponent.
5(1)->2+
5 = Max group size 5.
(1) = 1 game per opponent at a time. Once the first game is over the second one starts. (one game per opponent starts immediately) vs. (2) (both games per opponent start immediately)
->2 = Two players go on the the next round if any. # Advance:
+ = Tiebreaks No. Without the + is Tiebreaks Yes.
Note the formats "5->1, 10->3+" without bracketed numbers are not valid. They are incorrectly displayed in the Current Tournaments area here.
Thanks for bringing this to our attention. I have updated the help page with a new section to explain this and also updated the tournaments page to correct the formats.
http://www.chess.com/tournaments/help.html#format
Can any one inform me about the verious formats(like 5->1, 10->3+,5(1)->2+ etc.) used in chess tournament. & what does those means?