Author: Flanel
Conditions are as it follows:
1. a long black line, a gravestone or a a bearish engulfing line
2. volume levels at least 2 times higher than average
3. a negative variation of at least -1%
REM Condition 1: a long black line, a gravestone or a a bearish engulfing line
black = (close < open) AND (open - close > range * 3 / 4)
gravestone = (high - open) >= (2 * ABS(close - open)) AND (close - low) <= (range / 8)
engulfing = (close[1] > open[1]) AND (open > close[1]) AND (close < open[1])
c1 = black OR gravestone OR engulfing
REM Condition 2: Volumes > 2 * average
c2 = VOLUME > 2 * AVERAGE(VOLUME)
REM Condition 3: Variation of at least 1% over the previous candlestick
c3 = VARIATION < -0.1
SCREENER[c1 AND c2 AND c3](VARIATION)