[%c_effect b3;square;b3;type;GreatFind;persistent;true] As is typical in these situations where you need to attack the opponent's king, the white rook uses the third rank as a passage to the kingside.
1. e2e4  1... e7e5  2. g1f3  2... g8f6 One of the questions that made me curious before the start of the tournament (and I'm certainly not the only one) is what the players would try against Nepomniachtchi's unbeatable Petroff, which has served him so well since the last Candidates Tournament. This game is a good answer. 3. f3e5  3... d7d6  4. e5f3  4... f6e4  5. d2d4  5... d6d5  6. f1d3  6... f8d6 In modern popularity, the bishop development on d6 has surpassed the move 6...Nc6, which was the main weapon more or less 20 years ago. 7. e1g1  7... e8g8  8. c2c4  8... c7c6 So far, so good. All this has been played by Nepomniachtchi in many games. 9. b1c3 The most popular move, but many others are possible. 9... e4c3  10. b2c3  10... d5c4  11. d3c4  11... c8f5  12. c1g5  12... d8a5  13. f3h4  13... f5e6  14. c4e6  14... a5g5  15. h4f3  15... g5a5 Nothing new yet. All this has been played in many games by the world's best players, including one by Nepomniachtchi. Now it starts to get really interesting. 16. e6h3 In my database, I found just five games with this bishop retreat. 16... a5c3 A new move, but hardly a surprise, as it's the first choice of the computer. In all other games, Black decided to go back with the queen to c7. Black wins a pawn, but White has better development and chances to attack the king, as it's not surrounded by minor pieces and looks rather unprotected. 17. a1b1  17... b7b6 