For example, computer defends well, but for humans its is harder to defend than attack, particularly with the modern time control.

He was a World Chess Championship candidate on seven occasions (1956 1965 1968 1974 1977 1980 and 1985). Boris Vasilievich Spassky (also Spasskij; Бори́с Васи́льевич Спа́сский; born January 30 1937) is a Soviet-French chess grandmaster.