[%c_effect h4;square;h4;type;Interesting;persistent;true][%c_arrow h4f5;keyPressed;none;from;h4;opacity;0.8;to;f5;persistent;false] An interesting move that shows a small problem with putting the queen on e7. White wants to capture the pawn on d5 and then place the knight on f5.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g2g3  3... d7d5  4. f1g2  4... f8b4 [%c_arrow b1c3;keyPressed;none;from;b1;opacity;0.8;to;c3;persistent;false,c1d2;keyPressed;none;from;c1;opacity;0.8;to;d2;persistent;false,b1d2;keyPressed;none;from;b1;opacity;0.8;to;d2;persistent;false] A very popular choice in this particular move order of the Catalan Opening. This check forces White to transpose the game to a Nimzo-Indian after 5.Nc3, place the bishop in a slightly worse position with 5.Bd2, or place the knight in an undesirable square after 5.Nd2. 5. b1d2  5... e8g8  6. g1f3  6... b7b6  7. e1g1  7... c8b7  8. b2b3 A simple and logical move, preparing to develop the bishop. 8... b8d7  9. c1b2  9... d8e7  10. a2a3  10... b4d6 