No. 1674 Borislav Gadjanski
original - 19.12.2021
Solution: (click to show/hide)
(C+ by Popeye 4.87)
Reciprocal Peri-critical maneuvers by wR&wB + reciprocal Indian maneuvers by bR&bB.
Self-blocks on a6 by wR&wB, guarding duties and line-opening by bRg3.
The mechanism uses all 8x8 space of the board, and all 4 edges.