Evaluation. The number of chips on each vertical is a multiple of 3, meaning there are no more than 6, and on the entire board - no more than 48. Example: 32 white chips are placed on white squares, and 16 black chips are placed along the main "black" diagonal and along two parallel diagonals of "length" 4.

## Answer

48 chips.
Shapovalov A.V.

What is the maximum number of white and black chips that can be placed on a chessboard so that in each row and each column there are exactly twice as many white chips as black ones?