bullish reversal pattern is considered highly reliable.
a downtrend, a long black candlestick day is followed by a day that gaps in the
direction of the trend. However, the third day is a white/empty candlestick day
which closes up within the top half of the black day.
came into the market and the downtrend weakened. The rally and gap up confirms
the reversal if there was also good volume that day.