# One SmartChoise chain at a time

When enabled (**Yes**), the account is allowed to have **only one active SmartChoise trading chain** at any moment.

{% hint style="info" %}

#### How it works

* The EA instance set as **Master** can open and manage trades
* **Child** instances linked to that Master can participate in the same chain
* Any other SmartChoise instances not part of the active Master chain will remain **paused** and will not open new trades
  {% endhint %}

{% hint style="info" %}

#### Why this is useful

If you run several instances, multiple entries can trigger at once and multiply your risk.\
This option ensures **only one coordinated chain** is trading at a time.
{% endhint %}

{% hint style="danger" %}

#### Important

Enable this option on **all SmartChoise EAs** on the account.\
If some instances don’t have it enabled, they can still open trades and create overlap.
{% endhint %}


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