Add a new type of double-elimination (poolkets)
I saw very often people using this type of double-elimination: it's quite similar to the standard but, excluding the first round in loser bracket (in which the loser goes home), from the second round to the loser bracket final, are automatically generated 4-players round robins; the winner of the round robin is the only one who passes.
We name it "Double Elimination with poolkets"
In this way (http://img151.imageshack.us/img151/9382/poolket.jpg), loser bracket is composed of the same number of rounds of the winner bracket, i.e. there are no "pauses" during the tournament, in order to let people in losers arrive to the final.
In the standard double-elimination bracket, in losers bracket let's say A has to beat B, and C has to defeat D. Then, the winners of the matches are facing each other.
With the poolkets, A is facing B, and either C is facing D; either the winners are facing anyway (let's say that winners are A and C), but are added A vs D and B vs D. In this way, all players are facing the most quantity of players, in order to have a more fair/equilibrated tournament.
Reassuming the purpose:
-Name: Double Elimination with Poolkets
-What is it: direct elimination round in lower bracket (excluding the first) are substituted by round robin of 4; this allow to play more games and, last but not least, the lower bracket is composed of the same number of rounds of the winner bracket (no pauses for everyone).
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Morto Maltese commented
http://img151.imageshack.us/img151/9382/poolket.jpg
The correct link to the image of the explaination.