Crab + AB=CD + RSI BAMM

The key characteristics used to identify the Harmonic Crab pattern are as follows::

AB leg can retrace anywhere between 38.2% up to 61.8%
BC can retrace 38.2% – 88.6% of AB leg
CD is an extension of up to 161.8% of XA leg and is also an extension of 224% – 316% of the AB leg
After the crab pattern is established, traders can take their positions at or from point D (at the high or at the low of the price bar at D) targeting 61.8% and 127.2% of CD leg.

Within the ABCD patterns, there are 3 types as mentioned below.

Price and Time: Under this type of ABCD pattern the amount of distance and the time it takes for price to travel from A to B is equal to the time and distance from C to D
Classic ABCD: In this pattern, the BC is a retracement of 61.8% – 78.6% of AB, with CD being the extension leg of 127.2% to 161.8% (equal in price distance)
ABCD extension: CD leg is an extension of AB between 127.2% – 161.8%