MAK conclusions (in Russian):
http://www.mak.ru/russian/investigat...s_ra-42434.pdf
http://www.mak.ru/russian/investigat...l_ra-42434.pdf
Both pilots had a most of experience on Yak-40, where the position of feet on pedals differs from the Yak-42.
The FO had a bigger leader authority than the Capt. The FO blood contained some phenobarbetal, which is prohibited for pilots, and had a neural disorder (polyneuropathy).
Takeoff weight, V1, V2, Vr have never been calculated.
Someone inadvertently pushed the brakes, and the braking power didn't allow to lift off, then the full power was selected, both pilots started pulling the yoke, it didn't help.
At the end of the runway, Capt. pushed the yoke for 1 second, the FO asked "What are you doing?" and then the Capt. pulled it back again. The flight engineer after noticing the movement of the yoke forward, immediately moved the throttles back, but after explicit of the FO: "What the f'*k?!" and the command of the Capt. "Full Power!" moved them back to full power.
After losing the braking power on the grass, the plane lifted off, stalled and crashed as it was described in the earlier comments.