With my new toy http://www.maskeret.com/mecca/elo_fide.htm and the K factor
supplied by the good people of rgcm I plugged in these values (from ICC) for
Bologan at Dortmund

Your initial ELO 2650
Your K coefficient 10
Your score 6.5
Tournament Type R
Your opponents ELO 2774 2774 2785 2785 2648 2648 2739 2739 2574 2574

It gave these results

Average ELO Opponents 2699
Expected score (We) 4.3
Difference Score - Expected 2.2
Difference in ELO points 22
Rounded difference 22
Your New ELO 2672

*Performance 2814*

Hope I got this right

cheers

dd