The Catalan with 4...Bb4+ and the Open Catalan with 5...Bb4+
The move Bb4+ is a way to get the Catalan player out of "main line" Catalan positions, and into a weird mix of the Catalan and the Bogo-Indian.
Whole Catalan Opening playlist: www.youtube.com/watch?v=s0mAzxJRHpk&list=PLssNbVBYrGcBwWsSqwig0dAymsPQd0dzy
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The Catalan is a powerful weapon for white to add to his repertoire. It's versatile, and can lead to many different types of positions, and yet it's fairly simple to learn the plans and ideas in it since you always develop your pieces to the same squares and have similar plans against almost everything black does.
The Catalan can be divided into closed and open variations, Open Catalan being the ones in which black captures your c4 pawn which you've offered as a gambit. Once that capture is played, the open Catalan starts.
The alternative to the closed and open Catalan positions is the early Bb4+ black could play. This move steers the game towards something more positional and definitely not nearly as sharp as the main line.
#chess