Inside bar after three down bars

I changed the title of your question in the hopes that it more clearly describes your request. The one you entered didn't really include any details at all.

I wrote the code according to your description. If you had provided a screenshot showing these signals on a chart that would have helped ensure you or I didn't miss any details. As it stands, this turns out to be an exceptionally rare price pattern.

Here is the code, with screenshot below showing the pattern on a chart.

def downBar = close < open;
def threeDownBars = downBar and close < close[1] and downBar[1] and close[1] < close[2] and downBar[2];
def specialInsideBar = threeDownBars[1] and downBar and close < close[1] and high < high[2] and low > low[2];
plot fifthBar = specialInsideBar[1] and low > low[1];
fifthBar.SetPaintingStrategy(PaintingStrategy.BOOLEAN_ARROW_UP);
fifthBar.SetLineWeight(3);
fifthBar.SetDefaultColor(Color.CYAN);