Harmonic and chart patterns
AB=CD pattern
A move, a pullback and a second move of about the same size: the simplest harmonic pattern.
L’idée en termes simples
Markets often move in steps of similar length. If A-B was a 100-pip move and B-C a pullback, C-D is often about 100 pips too.
Mode de calcul
Click A, B, C and D. The tool shows BC as a ratio of AB, CD as a ratio of BC and CD as a percentage of AB. After C it draws where D is likely (CD = 100%, 127.2% or 161.8% of AB); after D it draws the targets (38.2% and 61.8% of CD back from D) and a stop beyond the next extension of AB.
BC usually 0.618–0.786 of AB
CD ≈ AB (100%), often 1.272–1.618 of BCComment l’utiliser
- Project D to find a potential end of the move and plan exits or reversals there.
Tirer des conclusions
- CD much longer than AB shows a strengthening trend.
Exemple
AB rises 80 points, BC retraces 50 points (0.625), so D is expected about 80 points above C.
Les prix des exemples sont donnés à titre d’illustration.
Points de vigilance
- Like all patterns, use it with other evidence.
Un peu d’histoire
Described in H. M. Gartley's work and popularised by Larry Pesavento and Scott Carney.
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