Kateryna Lagno lost the first game after failing to calculate carefully enough in a critical situation — or perhaps she lacked optimism.

Russian and Chinese players have often dominated the women’s World Championship cycle
After a draw in the second game, Lagno got a winning position in the third, but could not convert her advantage into a full point.
In the final fourth game Lagno was also winning, this time in an endgame with an extra pawn, but once again Tan was able to save the draw. The Chinese won the tiebreak by a 2½-1½ score, thus advancing to the tournament’s semifinals.
Tan will face Aleksandra Goryachkina, starting Tuesday. A total of four classical games are again set to take place, as well as a tiebreak if necessary.
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