Defending champion Viswanathan Anand has suffered a shock defeat at the hands of Dutch Grandmaster Anish Giri in the fourth round of the Bilbao Masters final chess tournament in Bilbao, Spain. This was Anand's first loss against Giri in Classical chess.Riding on his victory, Giri joined overnight leader Wesley So of United States in lead on six points.Wesley So drew with Liren Ding of China who now shares the third spot with Anand on three points with two rounds still to come in the four-players double round-robin tournament.