Defending champion Viswanathan Anand’s quest to retain the crown suffered a decisive setback after he played out a draw with American Wesley So in the fifth and penultimate round of the Bilbao Masters Final Chess Tournament. After suffering a shock defeat at the hands of Dutchman Anish Giri in the previous round, Anand tried hard but could not break the solid defences of Wesley who continues to share the lead along with Giri.