The only acceptable square for the queen.
1. e2e4  1... e7e5  2. f1c4 The Bishop Variation is normally used to avoid the Petroff, which has proven to be a difficult defense to break, just look at Nepomniachtchi's games. I believe Wei was not so familiar with its nuances, as he will quickly be out of the book. 2... g8f6  3. d2d3  3... f8c5 3...Nc6 and 3...c6 are also very popular. 4. b1c3  4... c7c6 Wei said he was surprised by this move. It has been played, however, in hundreds of games, including games by super-grandmasters. 5. f2f4 A brave choice for someone who doesn't know theory. 5... d7d5 Warmerdam took his time before playing this move. It's likely that he was also out of book here, or at least did not do much analysis of this position. 6. e4d5  6... f6g4 This move brings chaos to the board. Black has many options. 7. g1f3 White thought for 50 minutes to play this move. 7... e8g8  8. f4e5  8... g4f2  9. d1e2  9... f2h1  10. c1g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] Developing the bishop and attacking the queen. It's surprising, but I found three correspondence games in this position.