How about Bc4? (I'm a new player, and so miss a lot of obvious things. Please be gentle.)
Hintless Puzzle #10
You're very bossy. A simple "Please don't post the solution or hints" would have sufficed, without all the other crabbing around.
You might want to fix your puzzle. A chess puzzle is commonly understood to have one "best" first move. I see more than one good first move, and they don't necessarily transpose to the same position later.

Spoiler Alert ! Answer will be given down below.
Ivan Sokolov vs Andrew Greet,
Gibtelecom Masters 2007
CORNISHMAN, Greet's ambition is to become a grandmaster, but today's puzzle, which looked a potential giant-killer oppurtunity for him, turned out to be a lesson from Holland's GM Sokolov who has a good record against English opponents.
Visually black's position seems quite good, with level material and a supported d4 passed pawn. However, the black king has ventured out too early. His majesty should be used activel in the endgame, but here there are enough pieces still on the board for white to generate winning tactics.
Unlikely though it seems, there are hidden checkmate possibilities.
What was White's winning move ?
Answer: 1.c6 ! (so that if dxc6 2.Bc4 mate) d6 2.Rc1 ! Rd8 3.c7 and Black resigned as White threatens both 4.Bc6 mate 4.cxd8=Q.
This article appear in the West Australia's Sunday Times by Leonard Barden
Hintless Puzzle #9 Hintless Puzzle #11