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11.2

Part of 2021 Kyiv City MO Round 1

Problems(1)

Skew knights

Source: Kyiv City MO 2021 Round 1, Problem 11.2

12/21/2023
Chess piece called skew knight, if placed on the black square, attacks all the gray squares.
https://i.ibb.co/HdTDNjN/Kyiv-MO-2021-Round-1-11-2.png
What is the largest number of such knights that can be placed on the 8×88\times 8 chessboard without them attacking each other?
Proposed by Arsenii Nikolaiev
combinatoricsChessboard