Spoiler (click to reveal)
1. c5-e6! The only winning move, exposing c5 to attack and threatening e6-e7, or e6xf7 if the d8 stack splits.
2. f7-e7 Hoping for blue to play 3. e6-f6? 4. d8-f7! 5. d4xc5 6. b6-c4 and red wins. Blue wins slightly faster if red takes d8xe6 or f7xe6.
5. c5xd6 It's not too late for blue to err with 5. c5xb6? 6. c4-b2 and red is quicker.
Other tries for blue don't work: 1. g5xh6? 2. b6-c4 and blue is too slow. If 1. c5-b7 2. d8xb7 3. d4xc5 4. b7-c7 and red wins. Blue suffers a similar fate after 1. c5-d7 2. d8-b7.