The method of dividing the chessboard so that each of the four parts
shall be of exactly the same size and shape, and contain one of the
gems, is shown in the diagram. The method of shading the squares is
adopted to make the shape of the pieces clear to the eye. Two of the
pieces are shaded and two left white.
The reader may find it interesting to compare this puzzle with that of
the "Weaver" (No. 14, _Canterbury Puzzles_).
[Illustration: THE GRAND LAMA'S PROBLEM.
+===+===+===+===+===+===+===+===+
|:o:| : : : : : : :
I...I...+===+===+===+===+===+===+
|:::| o |:::::::::::::::::::::::|
I...I...I...+===+===+===+===+...I
|:::| |:o:| : : : |:::|
I...I...I...I...I===+===+...I...I
|:::| |:::| o |:::::::| |:::|
I...I...I...+===I===+...I...I...I
|:::| |:::::::| |:::| |:::|
I...I...+===+===+...+...I...I...I
|:::| : : : |:::| |:::|
I...+===+===+===+===I...I...I...I
|:::::::::::::::::::::::| |:::|
+===+===+===+===+===+===+...I...I
| : : : : : : |:::|
+===+===+===+===+===+===+===+===+
]