Floor 3: Imbalance
What is an order block in trading?
An order block is the last candle of the opposite colour before a strong move that breaks structure: the last down candle before an up move, or the last up candle before a down move. SMC traders read it as a zone where large orders were placed, and watch for a reaction if price returns to it.
How to spot it
Every sharp move starts somewhere. Just before a strong rally there is usually a final down candle, the last moment sellers were in control. SMC traders call that candle a bullish order block. The story told about it is that large buyers were absorbing the selling there, building a position, and that some of their orders are still waiting at those prices. If price comes back, the zone is expected to act as support. A bearish order block is the mirror: the last up candle before a strong decline.
The problem with the loose definition is that it fits almost anything. Every move, large or small, is preceded by an opposite candle. So a useful definition needs conditions, and two matter most. The move that follows must be a real displacement, not an ordinary candle. And that move must go on to break structure with a candle close: a BOS or a CHoCH. Without both, the candle is just a candle.
An order block is then drawn as a zone, from the high to the low of that one candle, and extended to the right until price trades back into it. Once price has returned, the block is said to be mitigated and is no longer fresh.
The rule ForexLens uses
The rule ForexLens uses: take a structure break made by a body close, whose leg contains a displacement candle. The order block is the last opposite-colour candle before the first displacement candle of that leg, looking at most 5 candles back and never past the swing that was broken. The zone is the full high to low of that candle. It is mitigated by the first candle after the break that trades back into it.
Step by step
- Find a structure break: a candle that closed beyond a confirmed swing.
- Check the leg that caused it for a displacement candle. No displacement, no order block.
- From the first displacement candle of that leg, step back one candle at a time, up to five.
- Stop at the first candle of the opposite colour: a down candle before an up move, an up candle before a down move.
- Draw the zone from that candle high to its low and extend it right.
- Mark the block as mitigated when price first trades back into the zone after the break.
Bullish and bearish order blocks
- Bullish order block: the last down candle before an upward displacement that breaks structure. It sits below current price and is watched as possible support.
- Bearish order block: the last up candle before a downward displacement that breaks structure. It sits above current price and is watched as possible resistance.
- Mitigated block: one that price has already traded back into. Most traders consider it used.
- Failed block: one that price closes straight through. It may then be relabelled as a breaker block and watched from the other side.
How definitions differ between teachers
There is no single agreed rule, which is worth knowing before you compare charts. Some traders draw the zone from the candle body only, or from the open to the wick extreme, rather than the full high to low used here. Some accept a block without a structure break as long as the move away was strong. Some require the block to have swept liquidity first, or to leave a fair value gap directly after it. Others use the last two or three opposite candles as one block.
Each variant marks different zones on the same chart. ForexLens uses one explicit rule so that grading can be exact, not because it is the only reasonable one.
Worked example
The simulated chart below contains one valid order block and at least one look-alike. Before opening the Lens, work backwards: find the candle that closed beyond a swing, find the displacement candle in that leg, and step back from it to the first candle of the opposite colour.
The Lens shades the block and marks the structure break it belongs to, and it greys the decoys. The generated walk-through gives the high and low of the zone. For each decoy, ask which condition failed: was the move after it too small to be displacement, or did that move never close beyond a swing?
EUR/USD, 15-minute candles, simulated
Reading the chart, step by step
- Candle 30 is the first displacement candle of the leg, and the same candle closes beyond the swing at 1.09773: structure breaks upward.
- Step back from candle 30 to the last down candle before it: candle 29. That is the order block.
- Its zone is the full high to low of that candle: 1.09286 to 1.09515, 22.9 pips.
- Candles 6, 19, and 26 look similar but do not qualify: they are not followed by displacement that breaks structure.
These numbers come from the generated chart above. Change the seed and the prices change; the rule does not.
Takeaway: An order block is found backwards: structure break first, displacement second, and only then the last opposite candle before it.
Common mistakes
- Marking every opposite candle before a move. Without displacement and a structure break, nothing separates the candle from thousands of others. Most "order blocks" on social media charts fail one of the two tests.
- Choosing the biggest candle instead of the last. The block is the last opposite-colour candle before the displacement begins, even if it is small. A larger opposite candle further back is not it.
- Reusing a mitigated block. Once price has traded back into the zone, the idea that unfilled orders remain there has been used up. Treating it as fresh a second and third time is hope, not a rule.
- Drawing the zone you would like. Shrinking the box to the body when that gives a better entry, and widening it to the wicks when that avoids a loss, means there is no rule. Fix the convention before you look at what happened next.
Does it work? An honest note
The order block is the best known idea in smart money concepts and the one that deserves the most care. As a description it is fine: it marks the origin of a strong move, and the origins of strong moves are natural places for price to react, a point traders have made for a long time under names like supply and demand zones or the base of a rally.
The causal story is another matter. The claim is that institutions left unfilled orders in that candle and will defend the level. Retail charts contain no information about who traded or what orders remain, so the claim cannot be checked from a chart, and it does not match how large currency orders are usually worked: sliced over time, across venues, often by algorithms that have no reason to return to one candle. Our page on how FX dealers work explains this in more detail. There is also no independent evidence that order blocks predict reactions better than other support and resistance methods.
Hindsight flatters the idea. After a reversal there is always a last opposite candle to point at, and the blocks that failed are rarely posted. If you want to know whether it helps you, mark blocks by a fixed rule before the outcome is visible and keep score honestly. More in does SMC work? Most retail traders lose money.
Questions people ask
How do you identify an order block?
Start from a candle that closed beyond a swing high or low. Check that the move leading to it includes a displacement candle. Then step back from that displacement candle to the last candle of the opposite colour: that candle, from its high to its low, is the order block under the rule used on ForexLens.
What is the difference between an order block and supply and demand?
They are close relatives. Supply and demand zones mark the base from which a strong move left, often spanning several candles. An order block narrows that to a single candle and adds SMC conditions such as a structure break. Both rest on the same idea, that the origin of a strong move may be defended, and neither is proven.
Do order blocks really show institutional orders?
There is no way to verify that from a price chart. Spot forex has no public order book or trade tape, so a candle cannot tell you who traded or whether orders remain unfilled. The institutional story is an interpretation. What the chart does show is where a strong move began, which is useful without the story.
Is the order block the wick or the body?
Conventions differ. ForexLens uses the full candle, from high to low, because that is unambiguous. Many traders use the body only, or the open to the extreme wick, to get a tighter zone. A tighter zone gives a better entry price and gets missed more often. Choose one convention and apply it before you see the outcome.
What does a mitigated order block mean?
A block is mitigated when price has traded back into its zone after the move that created it. The SMC reading is that the orders assumed to be waiting there have now been filled, so the block has done its job. Most traders only consider unmitigated, or fresh, blocks for a first entry.
Practise it
Reading about a rule is not the same as applying it. These games generate a fresh chart each round, ask you to find it first, and grade you against the same rule.
Order Block
Mark the last opposite candle before displacement. The decoys have no displacement or no break.