H. E. Dudeney, Amusements in Mathematics (1917) No. 298 · Puzzles · Chessboard puzzles

Bishops--Guarded

Now, how many bishops are necessary in order that every square shall be either occupied or attacked, and every bishop guarded by another bishop? And how may they be placed?

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H. E. Dudeney, Amusements in Mathematics (1917) · No. 298

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