7,8,9 |

What is the maximum number of kings that can be placed on a chessboard so that no two of them attack each other

#
If in a square of four cells there are two kings, then they attack each other.

## Solution

We will divide the board into 16 squares $2 \times 2$.

Estimate. In each of these 16 squares, there can be no more than one king.

Example. Place a king in the lower left corner of each of the 16 squares.

## Answer

16 kings.