I don’t believe ending expanding diagonals actually exist. This was a Bob Prechter invention (it was not part of Ralph Elliott’s original work), nobody’s every seen one, and the example in The Elliott Wave Principle book does not meet the rules of an ending wave [Peter].
Rules (these are “hard” rules; they cannot be broken)
- A diagonal triangle always subdivides into five waves.
- An ending diagonal always appears as wave 5 of an impulse or wave C of a zigzag or flat.
- Waves 1, 2,3, 4 and 5 of an ending diagonal always subdivide into zigzags.
- In the expanding variety, wave 3 is always longer than wave 1, wave 4 is always longer than wave 2, and wave 5 is always longer than wave 3.
- In the expanding variety, wave 5 always ends beyond the end of wave 3.
Guidelines (guidelines can be broken but it’s rare that they are)
- Within an impulse, wave 5 is unlikely to be a diagonal triangle if wave 3 is not extended.
- In the contracting variety, wave 5 usually ends beyond the end of wave 3. (Failure to do so is called a truncation.) [I don’t believe there is such a thing as truncation – Peter]
- In the expanding variety, wave 5 usually ends slightly before reaching a line that connects the ends of waves 1 and 3.