 The game reached a position out of the opening with strong White pawn on d5, which posed problems for Black throughout most of the game.On move 20, Zhukova mistakenly took on e5 with her d-pawn instead of her bishop on g7, allowing Tan's White d-pawn to roll ahead.The only way to get rid of the strong pawn was to sacrifice an exchange but it resulted in a winning endgame for the Chinese (see diagram).