Thursday's round four saw the big clash between Humpy Koneru and Hou Yifan

Thursday's round four saw the big clash between Humpy Koneru and Hou Yifan. The Indian committed an early inaccuracy (8.cxd5 instead of 8.e3) and then another one on move 14, after which she got into a slightly worse double rook ending. Slowly but surely the Chinese GM made progress, and just before the time control she was going to win a pawn. At the press conference the players both thought that Black was already winning there, but instead the final mistake was made on move 40 as the analysis shows: