Here are the three solutions I've found that stop black every time. (All other black moves can be met with Rd6#)
Nightshadow
No, 1 Ned3 Nc4 and the other Knight is pinned. Nec3 was my 1st guess as well.
My 1Nc3 looks like it fails to ....Qe5 defending both Bxd5 and Rd6.
EDit:
Good one chessplayer, I did not see your analysis.
It works, good job Nightshadow and chessplayer11 and thanks to those who helped !
p-worry your solution doesn't work after bishop takes rook, king takes bishop and after knight to c3, king goes to c6.
true sorry
Here are the three solutions I've found that stop black every time. (All other black moves can be met with Rd6#)