White to move. Draw or win? How should white proceed?
- Qc4+! winning the Black Knight and the Black b-pawn cannot advance to b1.
a) 1...Ka3, 2. Qxc3+ White wins
b) 1...Ka1, 2. Qxc3 pinning the Black b-pawn and White wins.
c) 1...Kb1, 2. Qxc3 White wins