Sam Allardyce admitted he was on his feet ready to celebrate a second successive victory when a cruel twist of fate spoiled his trip to Sunderland.
With the sides locked together deep into injury time, Morten Gamst Pedersen slid a pass into striker Jason Roberts, who rounded keeper Marton Fulop but stabbed the ball wide of the empty net.
Allardyce said: "It was just a bobble. It caught him [Roberts] on the shin instead of on the side of the foot, so he didn't get a clean contact on it, unfortunately. I was convinced it was in. I was nearly up and dancing. He is bitterly disappointed, but that's life, at the end of the day."
He added: "He got himself into position, made a great run and a great first touch and unfortunately, just a bobble cost us a fantastic win.
"But we are all very pleased with the commitment of the players and I am pleased with, particularly, the second-half performance.
"I am delighted with two clean sheets and, hopefully, we can go on from here and play Manchester City and try to gain another three points."
The draw, which came six days after Allardyce launched his reign at Ewood Park with a 3-0 win over Stoke, left them still in 19th place in the table, but only three points adrift of Middlesbrough in 17th ahead of Sunday's clash with City.
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