The piercing line is the opposite of the dark cloud cover. The pattern appears at the bottom of a downward trend.

The signal is fast because the open of the trigger candlestick is right in tune with the prevailing trend.

The second candlestick opens gapping down from the previous close appearing initially that we still have significant bearish sentiment.

Then, almost suddenly, price begins to move up, and close well into the body of the previous candlestick.

This candlestick pattern is very high probability and you need to pay attention to it.

Telechart PCF - C1<C2 AND (O1-C1)>.6*(H1-L1) AND (C-O)>.6*(H-L) AND O<L1 AND C<O1 AND C>(O1+C1)/2