Mark Chisnell reviews the first full week of Leg 4, and one of the most significant splits in the race so far. A week ago Team SCA and Team Brunel tacked north away from the Philippines to head for Taiwan. The rest of the fleet played the shore and tacked around the northern tip of the island of Luzon, creating up to 150nm of leverage.

The northern boats won as they all came back together in the  Pacific – but why?