Originally posted by greenpawn34Hi. Notice 1. ... Kf8 fails to 2. Nh4-g6# as well. The trouble is to find a position where the King is forced to g8 on his previous move.
Can do it forcing Black to take one of the Knights?
This PGN could not be parsed.
[FEN "6kN/8/7K/8/4N2N/8/8/8 w - -"]1. Nf6+ Kxh8 2. Ng6#
That might be impossible. A King can take away three squares (say f6 f5 f4) and then there is a pattern of 2 x 3 squares (d6 d5 d4 e6 e5 e4) that has to be covered by three Knights. Three Knights can actually cover six adjacent squares but not in this way (I think) - imagine e5 & d4, d5 & e4, and then d6 and e6 remain.