Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e6/3. g3/3...Bb4

Black plays Bb4+, the same move as the Bogo-Indian Defense, and White must block the check. If White plays Nc3, the opening transposes into a Nimzo-Indian Defense, Romanishin Variation. The Bogo-Catalan Defense is the same move order as the Bogo-Indian, but against the Catalan move of 3. g3 instead of 3. Nf3.

Much like the Bogo-Indian, the Bogo-Catalan's mainlines are infamous for leading to several draws. However, unlike the regular Bogo-Indian, the Bogo-Catalan Defense has a couple of interesting sidelines which lead to imbalanced, fighting games against the Catalan Opening.