Is it possible to mate wtih only two kinghts?

um ... helpmate in 5. different thing.

Even better are Selfmate prob: the matee forces the mater into a pos. where the only legal move by mater mates matee -iykwim :)

WanderingWinder wrote: Whilst I believe that the OP has been answered quite well, it is instructive to note that much better questions arise in Q+K v. R+K or B+N+K v. K. these are both technically won in positions when material isn't immediately lost, but can be difficult to pull off. I haven't seen anything wrtiten on how to do it, though I am sure there is something out there, but I eventually figured it out by myself. Still, I'm not sure I remember too well at this point...

Against tablebase defence ('flying rook defence') Q v R gets tricky. I have excellent notes on how to still do it; but i can't post them - they are someone else's copyright - search rec.games.chess.* archives c. 1992 - NM [USA] Roger Poehlman.

On K+B+N vK there is LOT of material - it is rather simple but better practice for 3 days against a computer [1 day w/ tablebases off, 2 with tbs on]

K+Q v K+R - you didn't figure it out ... or else you are above IM level. No one knew the flying-rook defence until Ken Thomson's tablebases discovered it. [it is not humanly possible to learn the defence imo - but GM John Nunn et al are better judges of that - but it is possible and in fact rather easy [1]to
 learn to win against the flying rook defence.]

[1] 'rather easy' - once K+B+N v K becomes 'trivial' to one.

Checkmate with six knights WTF other than why you promote to six Knights why on earth do computers let this happen