1. Nxf5+ Kf6 2. Qg7+ Kxf5 3. Be4# [If 1. ... Ke8 then 2. Qg8# or 2. Qh8#] [If 1. ... Kf8 then 2. Qh8#] or [If 1. ... Kf8 2. Qg7+ Ke8 3. Qg8# or 3. Qh8#]