A Renko Long Tail Up Reversal is a turn down after a long, uninterrupted run of white bricks. Renko charts are built from bricks of a fixed size that ignore time and small price moves: a white brick is added when the price rises by one brick size, a black brick when it falls by one brick size. A steep advance without any pullback often leaves the stock overbought, so the first black bricks after it can mark a sharp reversal lower.
