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Is it possible, in terms of a helpmate, for two knights to checkmate a lone king? I'd like to know what people will say.
It's possible if Black errs at the very end, but otherwise White must stalemate before he can mate. Mate can only be forced if Black has a pawn, and even then only if it is blockaded by a White Knight and only within certain ranges of squares. The basic idea is White's King and one Knight restrict the Black King to near a corner, then the other Knight rushes in. White can then give the "stalemate" because Black's pawn can move - but he must do it before the pawn promotes, or to deliver mate on the very next move, even then.
The great endgame composer A.A. Troitzky wrote a treatise on K+2N v K+P a century ago, and it is one of the few endgame analyses which the computer "Table bases" could not improve upon.
Sure, help-mate is possible. It doesn't even have to be in a corner:
They do need assistance of their own King for this, though.
Wow, I didn't know this.
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