"It states that if an asset drops after a price increase, it will lose between 50% and 67% of recent price gains before rebounding. "
So over any given range, the retrace will test the thirds for support and resistance. NQ counts in the thousands so xx666.00! You'll see similar across smaller TFs and ranges as well using 33.34% and 66.67% retraces.
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Here's with the XX333 added, same rule
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333 tends to be a bull retrace support and bearish extension resistance 666 tends to be a bear retrace support and bull extension ressitance