1. c2c4  1... g8f6  2. g2g3  2... e7e6  3. f1g2  3... d7d5  4. g1f3  4... d5d4 One of the most aggressive options for Black, deviating from the solid play of the Catalan Opening and leading to a more unbalanced game, characteristic of the Benoni Defense pawn structure (here with reversed colors). 5. e1g1  5... c7c5  6. e2e3  6... b8c6  7. d2d3  7... f8e7  8. e3d4  8... c5d4  9. f1e1  9... e8g8  10. b1a3 [%c_arrow a3c2;keyPressed;none;from;a3;opacity;0.8;to;c2;persistent;false,a2a3;keyPressed;none;from;a2;opacity;0.8;to;a3;persistent;false,b2b4;keyPressed;none;from;b2;opacity;0.8;to;b4;persistent;false] A classic plan: the knight goes to c2, and White will try to play the b2-b4 advance at some point. 10... h7h6 [%c_arrow e7c5;keyPressed;none;from;e7;opacity;0.8;to;c5;persistent;false,e7d6;keyPressed;alt;from;e7;opacity;0.8;to;d6;persistent;false,e6e5;keyPressed;alt;from;e6;opacity;0.8;to;e5;persistent;false][%c_highlight c8;keyPressed;none;opacity;0.8;square;c8;persistent;false] A subtle and difficult-to-understand move. I believe the idea is to move the bishop from e7, maybe to c5 (as in the game) or to d6, supporting the e6-e5 advance, which opens the diagonal for the bishop on c8. The pawn move is useful to guard against Bg5 after the e7-bishop moves.