Hello Kirill,
are you sure ?
In "
Soviet Lend-Lease Fighter Aces of WW2" by Mellinger, Shamanov is associated with the A-20.
Also the A-20 is depicted on the Shamanov website, which I cannot read, because I can't speak Russian :-(
http://airaces.narod.ru/all14/shamanov.htm
Have a nice weekend,
Michael