1...Nc6 I will play moves with white that prolongue the mate for as long as possible. 2.Kc2 Nc5 3.Kc3 Na6 4.b4 Naxb4 5.c5 Nd5+ 6.Kc4 Nc7 7.Kd3 Kd7 8.Ke3 Ke6 9.Kf4 Kd5 10.Kf5 Ne6 11.Kg4 Ke5 12.Kf3 Nf4 13.Ke3 Kf5 14.Kf3 Nd5 15.Kg3 Ke4 16.Kf2 Kf4 17.Ke2 Ke4 18.Kd2 Nf4 19.Kc3 Kd5 20.Kc2 Kc4 21.Kd2 Kd4 22.Ke1 Ke3 23.Kf1 Kf3 24.Ke1 Ng6 25.Kf1 Nge5 26.Ke1 Nc4 27.Kd1 Ke3 28.Kc2 N4e5 29.Kd1 Nf3 30.Kc1 Kd4 31.Kc2 Kc4 32.Kc1 Kc3 33.Kd1 Kd3 34.Kc1 Nfd4 35.Kb1 Nc2 36.Kb2 Ne3 37.Kb3 Kd4 38.Kb2 Kc4 39.Ka2 Kc3 40.Ka3 Nf5 41.Ka4 Nfd4 42.Ka3 Kd3 43.Ka2 Kc2 44.Ka3 Kc3 45.Ka4 Kc4 46.Ka3 Ne2 47.Kb2 Kd3 48.Kb1 Kd2 49.Ka1 Kc2 50.Ka2 Kc3 51.Ka3 Nf4 52.Ka4 Kc4 53.Ka3 Nd3 54.Ka4 Nb2+ 55.Ka3 That is 50 moves since the past pawn move so unfortunately this does not quite make it, (as if this could ever happen in a human game; then again it could be applicable in an engine vs engine situation). 55...Kc3 56.Ka2 Nc4 57.Kb1 Kd2 58.Ka2 Kc2 59.Ka1 Nb4 60.c6 Na5 61.c7 Nb3# Absolutely ridiculous. It probably could be thought of in terms of technique, (taking one pawn, blockading the other, somehow amazingly beating the king into the corner, all perfectly timed for a mating sequence at the end where the knight blocking the pawn moves and white's king is stalemated so has to push the pawn, which gives black the required tempos to mate. Having thought about it, regardless of where the pawns are, if there is a win then black will use the same method of pushing the king in the corner and then hopping across the board with the blockading knight to mate. I'd say a 2 knights vs pawn ending would be humanly possible, but it would have to be a position fairly close to the mate.
Position at move 59 with black to play: 59..Nb4 60.c6 Na5 (or ..Nd2) 61.c7 Nb3#
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