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Walkabout
Rotational twins
13 Oct. 2026
The twinning device typically involves adjusting certain pieces in the diagram to create a second position for solving, given the same task. Rotational twins are a more curious type where new positions arise from rotating the whole diagram by 90° or more increments. Such additional arrangements preserve the relative placements of all the pieces, but usually exploit the changed directions of the pawns to produce non-equivalent solutions. For this selection, I shall focus on thematic examples that utilise the rotational shifts intensively, or feature the three special chess moves. These special moves are pawn promotion, en passant capture, and castling, all of which depend on board orientation to be playable.
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