Your fourth is not the Main Setup. That's only if Black plays the Closed Catalan, which isn't the main line.
Main line:
The Catalan Opening: Part I - Introduction
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The Catalan Opening is one of those systems many Grandmasters have employed in serious games. Let's warm up with a puzzle that comes from a Catalan game:
Carlsen drew Anand in the Catalan:
Of course - the Catalan is not a draw! Let's see how Alphazero crushes Stockfish:
Below is the main setup:
The main idea in the Catalan is still unclear. The normal plan is to put pressure on the queenside, while engines like Alphazero have gave us new ideas and made interesting novelties that make us think: is there a better plan? What do you think?