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Ahead of it's time, actually
One of the most popular new systems to come out in a while is the Knockout (KO) system. Like Red 7, it is an unbalanced count. In fact, the only difference between Red 7 and KO is that KO counts all 7's as low cards, not just the red ones.
All of the popular level one systems (Hi-Lo, KO, Red 7, Hi-Opt I, Silver Fox, etc.) are pretty much comparable in effectiveness.
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