OLL 11 algorithm: Downstairs
OLL (orient the last layer). Group: Small lightning bolt shapes.
OLL 11, Downstairs: yellow stickers on the top face: centre, right edge, front-left corner, front edge. Yellow stickers on the sides: back face, left, back face, centre, right face, back, front face, right, left face, middle.
The diagram shows the cube from above with the front at the bottom and yellow on top.
Algorithm
M R U R' U R U2 R' U M'
10 moves.
Other algorithms
r' R2 U R' U R U2 R' U M'S R U R' U R U2 R' U2 S'y2 r U R' U R' F R F' R U2 r'
Source: www.speedcubedb.com