Obtrusive piece
A promoted piece, which, however, does not increase the number of pieces of the same type compared to the initial game-array position. For example, a white dark-squared bishop on a square different from its initial game position could appear only by promotion if Pb2 and d2 stood on their initial squares. Obtrusive pieces are allowed, but should be avoided.
See also: Promoted force.
Loshinsky, Lev
Korolkov, Vladimir
Sahs/Shakhmaty (Riga), 1967
1st Prize
h#2 4.1... (8+13)
1.Qf4
g4
2.S3e4
d4#
1.Kd4
gxf3
2.e5
dxc3#
1.Kf4
gxh3
2.S5e4
dxe3#
1.Ke4
g3
2.Sd7
d3#
Obtrusive wBb6.