淘汰赛这种赛制有时会同循环赛制相结合，只是在八分之一或四分之一的晋级赛时采用。。。。。


淘汰赛是指体育比赛和其它各种比赛中的一种赛制，在这种赛制中赛员两两相对，输一场即淘汰出局。每一轮淘汰掉一半选手，直至产生最后的冠军。在单淘汰赛制中赛会组委会事先会将全部选手按预赛名次或种子顺序进行编排，也支持部分种子选手直接从中间某轮开始参加比赛的安排（即轮空）。这种赛制简洁明了，对选手数几乎可以不加限制。缺点是偶然性较大。这种赛制有时会同循环赛制相结合，只是在八分之一或四分之一的晋级赛时采用该赛制，如每四年一届的足球世界杯就是采用这种方法。

May be good to do search and learn the various systems if you wish to have more complete picture.

e.g. for Bishan Internal Competition

2003 -- 12 players (Round Robin System) -- 11 rounds
2005 -- 16 players (Round Robin System) -- 15 rounds
2006 -- 24 (Round Robin System by standards) -- 3 groups of 8,8,8. 11 rounds in Phases 1 & 2
2007 -- 20 (Round Robin System by standards)-- 4 groups of 4,6,6,4. 8 rounds in Phases 1 & 2
2008 -- 23 (Round Robin System by standards)-- 4 groups of 6,6,5,6. 8 rounds in Phases 1 & 2
2009 -- 25 (Round Robin System by standards)-- 5 groups of 6,4,5,4,6. 8 rounds in Phases 1 & 2

we are using 分级循环赛制 since 2006 so as to reduce the number of rounds when we have more players and not able to use Round Robin System, Furthermore, we prefer players to play with others about the same standards and not all the players in Round Robin System.

Bishan 分级循环赛制

11 rounds -- 7 rounds in Phase 1 and 4 rounds in Phase 2

8 rounds -- 5 rounds in Phase 1 and 3 rounds in Phase 2

in this Bishan 分级循环赛制, you do not face the same player twice, it is a two-level (Phases 1 & 2) 分级循环赛制.

In Phase 2, lower half of Upper groups to play with upper half of Lower groups, all need to play in Phase 2 except the two ends, this is the reason for us to have 6 players each at two ends in Phase 1 so that minimum of 5 rounds for the two ends if they do not need to play in Phase 2 after the reviews of yearly compettions.

Phase 3 is using 擂台赛 concept depending on the ranking results after Phase 2. We may have 分先 in two games if we need to have 擂台赛 for 2009 Bishan Internal Competition in Jan 2010.