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According to a certain anecdote, in the 19th century, a station attendant, who was also a passionate chess player, surprisingly realized that it was easier to win without a queen than with one. What happened a few days before that?
Alekhine was born in 1892.
Can you make a wish?
An ant runs along the edges of a regular tetrahedron, and a spider runs all over its surface. The ant's speed is v. What should be the minimum speed of the spider so that it can catch and eat the ant? The answer must be explained.
and a spider all over it
Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.
(Закон сохранения).
Hmm... Maybe "across its entire surface"?