white play to win
white play to win (unusual cavalry...)
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good puzzle. verry funny.
By tablebase, the problem is sound. K+2N v K+N is usually a draw, unless the king is already trapped in a corner and the N can't save it. K+3N v K or K+3N v K+N is generally a win. With the third knight, there exist mating patterns on the edge of the board - which can be forced, along with the standard corner one.
wikipedia says that “Three knights and a king can force checkmate against a lone king within twenty moves”. (http://en.wikipedia.org/wiki/Checkmate#Three_knights)
See how the computer (Shredder) played, in the position of this topic puzzle, in this topic:
http://www.chess.com/forum/view/general/can-3-knights-force-mate
