A puzzle from 1898. Copy of "Le Fermier Avisé" from "The book of ingenious & diabolical puzzles", Jerry Slocum and Jack Botermans
Place the 9 cardboard pieces in a square of 3 x 3 pieces.
Where 2 numbers lie against each other, the sum must always be the same.
So: In each square cage the same number of chicks.
To make the puzzle more beautiful I made adjustments,