<140... Bb6 (cutting off a7)
141. Kb8 Nb5 (heading for c7)
142. Ka8 Nc7+ (beginning the W Maneuver)
143. Kb8 Bc5 (Black needs to lose a tempo to force the king to c8)
144. Kc8 Ba7 (sealing off b8)
145. Kd8 Nd5 (continuing the Maneuver)
146. Ke8 Kd6 (146. Kc8 Kd6 147. Kd8 Ne7 does not help White)
147. Kf7 Ne7! (A key moment- it looks as if White can escape but this is an illusion. Just stick to the Maneuver.)
148. Kf6 Be3 (This is the point. The knight and bishop work beautifully to keep the king on the 8th rank.)
149. Kf7 Bd4 (closing in even further)
150. Ke8 Ke6
151. Kd8 Bb6+
152. Ke8 Nf5 (The W is nearly complete and the end is near.)
153. Kf8 Bc7
154. Ke8 Ng7+ (Now the king and bishop must take up their ideal positions.)
155. Kf8 Kf6
156. Kg8 Kg6
157. Kf8 Bd6+
158. Kg8 Nf5 (The maneuver is complete and everything is in place. Time to mate.)
159. Kh8 Be7 (One last tempo move, avoiding 159...Nh6?? stalemate.)
160. Kg8 Nh6+
161. Kh8 Bf6#>