Dog And Cat
Designed by Minoru Abe, produced in Japan circa 1990.
(cardboard box, wood tray, 8 wood pieces, and wood keeper, 5 by 5.25 by 1 inch)
There are four 1 unit square pieces,
three 2/3 by 1 unit pieces, a large U piece that is 2+4/9 units wide, and a keeper piece that is 1 unit high by 2+4/9 units wide.
The U piece has a lower area that can hold a 2/3 by 1 unit piece and a 2 unit distance between the upper prongs.
The puzzle is to remove the keeper, slide the pieces to exchange the dog and cat, and return the keeper:
shows this puzzle in his Minoru Abe Gallery and indicates a solution of 67 rectilinear moves.
Baxter's Abe Gallery,