Наконец, в 1975 году Международная шахматная федерация не вынесла фишеровского затворничества и лишила его звания чемпиона.

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English:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Finally, in 1975 the International Chess Federation couldn't stand Fischer's seclusion and stripped him of his champion title.