Order blocks explained

An order block is one of the most talked-about ideas in ICT and "smart money" trading, and also one of the most loosely used. Ask ten traders to mark one and you may get ten different boxes. This guide gives you a tighter working definition, shows how bullish and bearish order blocks look, explains the reasoning traders use to justify them, and lists the checks that separate a meaningful order block from a random candle that happened to sit before a big move.

The basic definition

Price rarely moves in a straight line. Before a strong push up there is often a small down-close candle, and before a strong push down there is often a small up-close candle. The order block is that final opposing candle:

• Bullish order block: the last down-close (bearish) candle before a strong move up.
• Bearish order block: the last up-close (bullish) candle before a strong move down.

The candle itself usually looks unremarkable. What gives it meaning is the move that follows it. That makes order blocks something you identify after the fact: you cannot know a candle is an order block until the strong move away from it has happened.

How traders draw the zone

Conventions vary, so pick one and use it consistently:

• Full range: from the candle's high to its low, wicks included. This is the most common approach.
• Body only: from the open to the close. It gives a tighter zone that some traders prefer on higher timeframes, where wicks can be very long.
• Midpoint: many traders also mark the 50% level of the candle, sometimes called the mean threshold, as a reference inside the zone.

Whichever you choose, extend the zone to the right. The idea being tested later is whether price, when it eventually returns to this area, reacts to it.

The reasoning behind order blocks

The usual explanation goes like this: large participants cannot fill big orders at a single price without moving the market against themselves, so they build positions across a range. The opposing candle before a strong move is read as a footprint of that accumulation. If part of the intended position was left unfilled, the argument goes, price may be drawn back into that area later.

It is worth being honest about the limits. Nobody outside a trading firm can see its orders, and the story above is a model for organising a chart, not a verified fact about any particular candle. Treat order blocks as a structured way to choose areas of interest, and judge them by how well your own rules hold up in your own testing.

What makes an order block worth watching

Because almost every move has some candle before it, the basic definition catches far too much on its own. Three checks narrow it down.

1. Genuine displacement

The move away from the candle should be clearly stronger than the surrounding price action: large candles, decisive closes, little overlap. An ordinary drift away from a candle does not make that candle an order block.

2. An imbalance left behind

A strong move often leaves a fair value gap, a three-candle pattern where the wicks of candles 1 and 3 do not overlap. A gap inside the move is visible evidence that it was one-sided, which is what the order block idea depends on.

3. A liquidity story

The best-regarded order blocks form after price has taken out an obvious level, such as a prior swing low or a cluster of equal lows, where stop orders were likely resting. That event is called a liquidity sweep. An order block that forms right after a sweep has a clear reason to exist. One sitting in the middle of nowhere does not.

A candle that passes all three checks is a stronger candidate than one that passes only one. That does not make it a guaranteed turning point; it makes it a better-defined area to watch.

Mitigated and unmitigated order blocks

Once price has come back into an order block and reacted from it, the block is usually called mitigated. It has been tested once. It can still matter later, but many traders give it less weight than an unmitigated block, one that price has not returned to since it formed.

This is easy to overlook: two order blocks can look identical on a chart and still carry very different weight depending on what price has done since. Always check the history to the right of the block, not just its shape.

A worked example

A hypothetical walk-through with made-up prices on a fifteen-minute chart:

1. Price has been drifting lower and trades just below an obvious prior swing low at 2,340.0, taking out the stops sitting under it.
2. The next candle is a small down-close candle with a high of 2,339.5 and a low of 2,336.0. Nobody can call it an order block yet.
3. Three strong bullish candles follow, closing at 2,352.0, and they leave a fair value gap behind. Now the small down candle is the last opposing candle before displacement.
4. Using the full-range convention, the trader marks the zone from 2,339.5 down to 2,336.0, with the midpoint at 2,337.75, and extends it to the right.

All three checks are present: displacement, an imbalance and a liquidity sweep just before. That makes it a well-defined area to watch if price returns. It says nothing about whether price will return, or what it will do there.

Common mistakes

• Marking every candle before a move. Without the displacement, imbalance and liquidity checks, almost anything qualifies.
• Deciding after you want the trade. Looking at a chart, wanting to buy, and then finding a candle that "looks like" an order block is the most common misuse of the concept. Apply your checklist before you have a position in mind.
• Ignoring direction. A bullish order block inside a clear downtrend is a weaker idea than one that agrees with the larger trend.
• Forgetting the timeframe. An order block on a five-minute chart and one on a daily chart are very different in size and significance.
• Never removing old zones. Decide what invalidates a block, for example a candle closing fully through it, and delete it when that happens.

Putting it together

An order block is useful when it is part of a story: price takes out an obvious level, reverses with a strong one-sided move that leaves a gap behind, and the last opposing candle before that move becomes the area you watch for a return. Learn the definition precisely, apply the three checks every time, and keep notes on how your marked blocks actually behave. Your own records will tell you far more than any rule of thumb.

Sources

1. LuxAlgo Blog, "ICT Concepts: Order Blocks Explained" (last opposing candle convention, confirmation and the limits of the institutional story): luxalgo.com/blog
2. LuxAlgo Library, "Fair Value Gap": luxalgo.com/library/concept/fair-value-gap
3. LuxAlgo Library, "Liquidity Sweep": luxalgo.com/library/concept/liquidity-sweep
4. LuxAlgo Library, "Change of Character" (structure break as confirmation): luxalgo.com/library/concept/change-of-character