2 solutions

Keywords: bishop's zig-zag-walk in opposite directions in one diagram clockwise and counterclockwise, selfblock, remote selfblock, pendulum (b), battery creation, battery mates, battery play, annihilation, pin, pinning, sacrifice of white pieces (active), square vacation, line closing, line opening

This problem was first published here on 2022-11-02, accidentally deleted by the system and reentered on 2022-11-08.