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dxc8 with a queen promotion doesn't work. The bishop on h1 comes across the board to b7 blocking the check.
If you promote to a knight, the king just walks out of it.
Since pompom posted the solution six years ago, the next challenge is to construct a proof game for the starting position. Who will be first?
what about dxc8 promote to queen ?
Its illegal as it is pinned
Also, when you post alternatives, make sure black can't hang on by a thread.
dxc8 is not illegal, nor is it mate after Bb7