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A way to play a tail is to wait for a 50% retrace of the tail. Stop is a daily close above the tail. So if it retraces to about 52 then buy Rubles. If a daily close is above 54 then cover. I would like to know what a potential catalyst would be though. Putin would have to give back Crimea??? As you say, it is catching a knife scenario. Just brainstorming on here.