Devil's Chess - Wooden Brain Teaser Puzzle

This one of a kind sixteen pieces wooden brain teaser puzzle represent all the possible ways that two pieces of 2 colors cut in different angels can be joined.
The objective is to assemble the pieces into a two-layer, 5x5 checkerboards with the colors matching on both layers and with the colors being different on both layers.
Tjis puzzle won the 1990 Hikimi puzzle competition in Japan and considers one of the most difficult puzzles in our collection.