Really, this is other patterns combined. Notice the first candlestick and the second form a bearish harami, then we get a confirmation candlestick.

So just remember that a three inside down is a bearish harami with confirmation.

At this point in the pattern you don't really need any other price confirmation, but do use indicators to confirm your analysis.

This candlestick pattern is very high probability.

Telechart PCF - coming