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Mainzer Schach. Large variant with Janus, Marshall, and different setup. (11x8, Cells: 88) [All Comments] [Add Comment or Rating]About underpromotion, my concurrent Kibitz comment shows example of one in the making in recent Switching Ch. game, where Pawn-to-Knight can enforce series of checks, as David Paulowich posits. Conventionally they always come up with half a dozen at such as Tim Krabbe's chess page or Tim Harding's Chess Cafe column, in occasional subject. They consider it a really exotic topic. Where no Queen promotion, as in Falcon Chess, what is the underpromotion, Rook or Falcon? There I guess only Knight is underpromotion. Then unusual CVs may have hard-to-estimate values, so which piece would be underpromotion becomes subjective.