may 13, 1961 - World Chess Championship 1961
Tal vs Botvinnik
Description:
The 1961 World Chess Championship was played between former champion Mikhail Botvinnik and champion Mikhail Tal in Moscow from March 15 to May 13, 1961.
Tal had unseated Botvinnik in the 1960 match.
Botvinnik won convincingly, by a 13–8 margin, regaining the world title.