The US, China: Four hours to save the world.

Also: Taiwan, 'The Rock', Israel, Palestine and Iran.

Old men playing weiqi (Go), unknown, c1644-1753, woodblock print, Metropolitan Museum of Art, New York (on loan from the British Museum).

UNITED STATES. CHINA. Four hours to save the world.

An overdue meeting causes relief on both sides of the Pacific.

Joe Biden and Xi Jinping met for four hours on Wednesday, in their first meeting in a year. They agreed t…