[%c_effect e5;square;e5;type;Inaccuracy;persistent;true] This makes things worse.
1. d2d4  1... d7d5  2. g1f3  2... g8f6  3. e2e3  3... e7e6  4. f1d3  4... c7c5  5. b2b3 In appearance, White's system is unpretentious and harmless, but it keeps the pieces on the board and avoids a theoretical opening battle, which is a possible strategy to play for victory. 5... b8c6  6. e1g1  6... b7b6  7. c1b2  7... c8b7  8. b1d2  8... a8c8  9. a2a3 Useful to prevent Nb4. 9... f8e7  10. f3e5 An aggressive plan, preparing f2-f4 and a kingside attack. 10... c5d4 [%c_effect d4;square;d4;type;Inaccuracy;persistent;true] I don't like this move, especially in combination with the next one, as it opens the game for the b2-bishop. 11. e3d4 