Made in Japan by Hanabishi, circa 1985.

(cardboard box, wood tray, 2 keepers and 16 wood pieces, 4.75 x 9 x 5/8 inches)

A 4x3 portion on the left and a 4x5 portion on the right with a 2 unit high opening between; remove keepers and slide the pieces to make the 2x2 pieces meet. The right side is theUshipuzzle, but solving is easier by making use of extra space on the left. Here are every 4th position of a 32 rectilinear (46 straight-line) moves solution that ends with the couple meeting along a unit long portion of their edges:

To meet on a full edge, here are 10 positions of a 39 rectilinear (64 straight-line) moves solution:

To meet on a full edge, here are 10 positions of a 39 rectilinear (59 straight-line) moves solution:

With the supply of extra pieces on the left, any of the Dad's Family puzzles can be played on the right (Dad's Puzzler,Traffic Jam,Red Donkey,Century,Hole In One,Ushi, etc.). Puzzles with two 2x2 pieces and puzzles played in a 4 by 3 area are also possible.

Presented in the 1942 Filipiak book (a.k.a.Ten Block:Trans-Atlantic Puzzle, Traffic Cop Tangle), the problem is to exchange the two 2x2 pieces; below are all of the steps that move a 2x2 piece in a solution of 47 rectilinear moves (55 straight-line moves) that is presented inHordern's book(pieces are numbered the same as in that solution with M,W instead ofA,B):

The Hordern bookHughes Puzzle:Hordern book, describes the Hughes Puzzle as having been submitted to Amateur Handicraft Magazine USA by F. Clark Hughes in 1947. The problem is to move the 2x1 piece from the upper left to the lower right; here are every 6 steps of a solution of 23 rectilinear moves (27 straight-line moves) that is presented by Hordern:

Boxes with an aspect ratio of about two to one are relatively common. The thickness of an inside liner and the thickness of the left to right dividers can be adjusted to make the 4:3 and 4:5 aspect ratios of the left and right sides exact.

Made by J. A. Storer, 2007.

(wood box, 2 plexiglass keepers, and 16 wood pieces, 5.1 by 9.6 by 1.25 inches;

box originally for an old Starrett Micrometer; underside of lid has directions drawn)

Made by J. A. Storer, 2007.

(wood box, 2 plexiglass keepers, and 16 wood pieces, 3.9 by 7.75 by 1.1 inches;

box originally for some Yema Tostada - a Spanish dessert)

Here are the directions from the back of the box and the solution sheet. It shows the couple meeting along a full edge, with the meeting edge to the left of the center bar. The 32-move solution for them to meet on a 1-unit portion needs to have the meeting edge to the right of the bar (otherwise it takes 35 moves), whereas the 39 move solution works either way (depending on the choice for steps 38 and 39).

Further Reading - Baxter's Sliding Block Pages, from:

(Main), from: http://www.johnrausch.com/SlidingBlockPuzzles

(Happy Couple), from: http://www.puzzleworld.org/SlidingBlockPuzzles/happyCouple.htm

(Ten Block), from: http://www.johnrausch.com/SlidingBlockPuzzles/10block.htm

(Hughes), from: http://www.johnrausch.com/SlidingBlockPuzzles/hughes.htm