by Catherine TRIOMPHE NEW YORK, United States (AFP) — The battle for the world chess crown launched into a four-game tiebreaker on Wednesday, after 12 regular rounds failed to separate reigning champion Magnus Carlsen and his Russian challenger Sergei Karyakin. After a win apiece and nine draws, the young stars — both aged just 26 — head into the chess equivalent of extra time in soccer, beginning a series of four quickfire games in New […]