Tell me whether these people are chess Grandmasters or professional boxers: Nikolai Krogius, Evgeny Gleizerov, Dmitry Bivol, Nikolai Valuev, and Alexander Alekhine.
Nikolai Krogius, Evgeny Gleizerov and Alexander Alekhine are chess Grandmasters. Instead, Dmitry Bivol and Nikolai Valuev are professional boxers.
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(Optional) Context information is below.
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Answer the following query.
Tell me whether these people are chess Grandmasters or professional boxers: Nikolai Krogius, Evgeny Gleizerov, Dmitry Bivol, Nikolai Valuev, and Alexander Alekhine.

user
Nikolai Krogius, Evgeny Gleizerov and Alexander Alekhine are chess Grandmasters. Instead, Dmitry Bivol and Nikolai Valuev are professional boxers.
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