(against Mikhail Botvinnik), successfully defended it in 1966 (against Boris Spassky), and lost it to Spassky in 1969
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(against Mikhail Botvinnik), successfully defended it in 1966 (against Boris Spassky), and lost it to Spassky in 1969
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-17 from Wikipedia. The archived copy is preserved so this citation survives link rot.