White to play and win
Black has just played Nb8-d7
MM Millar v I Lewittom , correspondence, 1956
Reitstein makes a point of telling his readers that this was a correspondence game and the position was not found OTB, but I don't think it is particularly hard: not easy, but not a brain basher.
1 Qh5+! (consider all biffs) and black can either intervene a piece, losing it, move 1…Kf8, being mated by 2 Qf7, or permit the classic smothered mate: 1…Kd8 2 Nf7+ Ke8 3 Nd6+ Kd8 4 Qe8+ Re8 5 Nf7 mate.