In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.
Q: Sentence 1:Anand , the tournament 's hitherto - untroubled No. 1 seed , breezed through the quarterfinal round against his longtime rival Vassily Ivanchuk . Sentence 2:But Boris Gelfand gave Anand a challenge in the semi-final , and the match was not settled until a sudden - death blitz game .
A:
but