Classic ABCD: In this pattern, the BC is a retracement of 78.6% of AB, with CD being the extension leg of 127.2%
(equal in price distance)
The Harmonic Bat pattern has the following characteristics which can be used to identify the Bat pattern.
AB leg can retrace between 38.2% – 50% of XA leg
BC leg can retrace between 38.2% – 88.6% of AB leg
CD leg can retrace up to 88.6% of XA leg
CD leg can also be an extension of between 1.618% – 2.618% of AB leg