Angel And Satan

Designed by Minoru Abe, purchased 2012.
(cardboard box, wood tray, 7 wood pieces, and wood keeper, 5" x 4.4" x 7/8")

On the left and right, the top and bottom pieces are 4 units high by three units wide, and the middle pieces are 3 units square. The blue piece is 2 units high by 3 units wide. All notches and protrusions are 1 unit square. With the keeper piece removed, exchange the three pieces on the left with the corresponding three pieces on the right. Here is the start, every 7th move, and the final position of a 74 Rectilinear moves (108 Straight-Line moves, 308 unit moves) solution: