Reigning chess world champion Magnus Carlsen (right), from Norway, plays Italian-American challenger Fabiano Caruana in the first few minutes of round 12 of their World Chess Championship match on Monday in London.

Reigning chess world champion Magnus Carlsen (right), from Norway, plays Italian-American challenger Fabiano Caruana in the first few minutes of round 12 of their World Chess Championship match on Monday in London.

Reigning chess world champion Magnus Carlsen (right), from Norway, plays Italian-American challenger Fabiano Caruana in the first few minutes of round 12 of their World Chess Championship match on Monday in London.

Reigning chess world champion Magnus Carlsen (right), from Norway, plays Italian-American challenger Fabiano Caruana in the first few minutes of round 12 of their World Chess Championship match on Monday in London.