Escalation first appeared in the Games and Puzzles Journal in 1988.

Object: Capture the opponent's Wazir.

The five patterns occurring, the pieces they represent, and the number of each type in the set are as follows:

Wazir - 2
Fers - 4
Dabbada - 8
Knight - 2
Alfil - 16

A piece always consists of one or more patterns. The transparent upper tiles of the captured piece are placed on top of the capturing piece, any duplicate tiles being held in reserve for possible re-use.

Video: https://www.youtube.com/watch?v=HeOlz3ce6xA