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What phrase of Frederick the Great helped chess players get tax breaks? Detailed answer

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What phrase of Frederick the Great helped chess players get tax breaks?

In 1982, the German Chess Federation, after many years of attempts, obtained from the Ministry of Finance the recognition of chess as a "useful sport with educational value" (which allowed the federation to receive tax benefits). The decisive argument was a quote from a letter from the Prussian King Frederick the Great: "Chess fosters a tendency to think independently." The end of this phrase, which the federation chose not to quote, read: "... therefore they should not be encouraged."

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

How does the drummer of ZZ Top disprove his last name?

Members of the ZZ Top group are famous for their characteristic appearance detail - long beards. Ironically, the only beardless member of the group is the "bearded" drummer Frank Beard - he wears only a mustache.

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