Friday, September 30, 2016

[pislnyhv] KRPKR endgame

Is underpromotion ever necessary in the KRPKR chess endgame?  There are probably situations in which promoting to KQRKR is stalemate but KRRKR is a win.

When can the defender force conversion to a difficult KQKR endgame?, where difficult is defined as more than N moves away from an easily won position, e.g., checkmate, Philidor.

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