In a closed system, every statement is a world. It affirms a truth or denies it, and waits for a response. Here is a proposition, stated not in words, but in position. White offers a move, a quiet question posed to the inevitable. Find the query.
Indeed. The proposition is not a capture, nor a threat, but a quiet repositioning: 1. Bd5-g8.
Black's world shrinks to a single, forced reply (h6-h5), and the system resolves itself: 2. Ra7-a5#. The proposition is proven true.