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I have two indicators only. The conditions to open a trade it's as follow: If the first indicator met his own condition in the previous bar (shift 1) and the second indicator met his own condition only in any of the last 3 previous bars.

First indicator met condition in bar 1 + Second indicator met condition in bar 1 -------> Ok, open a trade.
OR
First indicator met condition in bar 1 + Second indicator met condition in bar 2 -------> Ok, open a trade.
OR
First indicator met condition in bar 1 + Second indicator met condition in bar 3 -------> Ok, open a trade.

Can I connect AND Block to OR Block? How can I build this parameters together?

Thanks for your help!

Sometimes the logic puzzle is tougher than creating the trade conditions.

Forget about OR and try:

A1 AND B1.
A2 AND B2.
A3 AND B3.

Connect each trio from START to BUY/SELL independently of the other two. The resulting EA should check all 3 possible "paths" separately.

Thanks a lot RJo, It works perfect now!!!

Got a question for Somebody:

When building an EA, I can have several TA blocks, connect all with an OR, then to BUY/SELL, then to END. The result will be when any one are true, the EA will proceed to the BUY/SELL block.

If I don't use the OR, but simply connect each TA block to the BUY/SELL block, the result will be the same, because the EA checks each condition separately, and as soon as one is true, it proceeds.

So, I can't see any difference in these two scenarios -- when would be a common occasion that I would need an OR?

Just curious to see if I am missing something.

You are are right. Results are the same. Having an Or icon makes it easier to visualize.