Rally-Base-Drop: Four Base Structures

Supply and demand zones come in four canonical patterns, named for the sequence of moves that form them. Understanding these patterns helps you spot zones quickly and rank them by quality.

The four patterns

1. Rally-Base-Drop (RBD) — forms a supply zone
2. Drop-Base-Rally (DBR) — forms a demand zone
3. Rally-Base-Rally (RBR) — forms a demand zone (continuation)
4. Drop-Base-Drop (DBD) — forms a supply zone (continuation)

Each pattern has three parts: an initial move, a base (the consolidation or single candle that becomes the zone), and a departure move.

Rally-Base-Drop (RBD) — supply

• Rally: price rises into a peak
• Base: a small consolidation or single up candle at the top
• Drop: price falls sharply from the base

The base is your supply zone. Aggressive sellers stepped in there, and price is likely to react when it returns. RBD zones are classic reversal supply zones — they mark the top of a move.

Drop-Base-Rally (DBR) — demand

• Drop: price falls into a low
• Base: a small consolidation or single down candle at the bottom
• Rally: price rises sharply from the base

The base is your demand zone. Buyers stepped in there, and price is likely to react when it returns. DBR zones are classic reversal demand zones — they mark the bottom of a move.

Rally-Base-Rally (RBR) — demand (continuation)

• Rally: price rises
• Base: a brief pullback or pause
• Rally: price continues higher

The base is a demand zone, but in a continuation context. RBR zones form during trends — pullbacks that institutions used to add to positions. They are often tighter and quicker than DBR zones.

Drop-Base-Drop (DBD) — supply (continuation)

• Drop: price falls
• Base: a brief bounce or pause
• Drop: price continues lower

The base is a supply zone in a downtrend continuation. Like RBR, these zones are tighter and reflect trend-following institutional behavior.

Ranking the patterns by quality

Not all patterns produce equally strong zones:

Highest probability (reversal zones):

• RBD (supply at a top)
• DBR (demand at a bottom)

These mark genuine shifts in order flow. The base sits at an extreme, and the departure is often sharp and imbalanced.

Slightly lower probability (continuation zones):

• RBR (demand in an uptrend)
• DBD (supply in a downtrend)

These are valid but often quicker and noisier. The base is a brief pause, not a turning point, so reactions can be smaller and less clean.

How to spot them in practice

1. Look for the departure first: find a strong, impulsive move
2. Walk back to the base: identify the consolidation or single candle that preceded it
3. Classify the pattern: RBD, DBR, RBR, or DBD?
4. Mark the zone: the high-low of the base is your zone
5. Validate: fresh, broke structure, HTF aligned?

Common mistakes

• Marking every pullback as RBR/DBD: continuation zones need strong departures. A weak pullback does not create a tradeable zone.
• Confusing the base with the impulse: the zone is the base, not the candles that moved away from it.
• Ignoring pattern context: an RBR zone in a choppy, range-bound market is not a continuation zone — it is noise.
• Treating all patterns as equal: reversal patterns (RBD, DBR) generally produce cleaner reactions than continuation patterns (RBR, DBD).

A practical filter

Before trading any zone, identify its pattern:

• Is it RBD or DBR? Higher priority — reversal zones.
• Is it RBR or DBD? Lower priority — needs more confirmation.
• Is the pattern unclear? Skip the trade. Ambiguity is not a setup.

The takeaway

The four base structures give you a vocabulary for classifying zones. RBD and DBR mark reversals; RBR and DBD mark continuations. Reversal zones tend to be stronger; continuation zones tend to be quicker. Learn to identify the pattern of every zone you mark, and you will immediately see which ones deserve your risk and which ones do not.