Surprisingly, this is already a new move.
1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. e2e3  3... c7c5  4. d4c5 [%c_effect c5;square;c5;type;Interesting;persistent;true] This interesting opening was recently tested in a decisive game of the Women's World Championship match. 4... e7e6  5. b2b4  5... a7a5  6. c2c3  6... a5b4  7. c3b4  7... b7b6  8. f1b5  8... c8d7  9. b5d7  9... b8d7  10. a2a4  10... b6c5  11. b4b5 The main strategic theme for this fun position is well defined: two passed pawns on the queenside against a flashy central majority. Which one is more important $2 As usual in top-level chess, the two factors balance each other out to create a dynamic equality. But it's the type of equality that requires a lot of precision from both players and in which the cost of a mistake tends to be very high. 11... f8d6  12. e1g1  12... d8c7 The queen is well positioned here, supporting the e-pawn advance and looking to the kingside. Of course, there's nothing wrong with castling first and deciding the queen's course later. 13. c1b2 