1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... c7c5  4. d4d5  4... e6d5  5. c4d5  5... d7d6  6. e2e4  6... g7g6  7. f2f4  7... f8g7  8. f1b5 [%cal df1b5][%c_arrow f1b5;keyPressed;none;from;f1;opacity;0.8;to;b5;persistent;false] Historically this line has always been considered one of the most dangerous against the Benoni. 8... f6d7 It is firmly established in opening theory that this is the best way to cover the check. 9. a2a4  9... b8a6 Now and in the next moves Black can castle, which may lead to a transposition of moves. But Rapport has other plans.