bad puzzle

i came across this puzzle

http://en.lichess.org/training/4079

correct move given is Nf5
& it's a mate in 4

i played
Kg7 to block g6 and this wins too

i verified this with stockfish (level 8 )on this site[it started sacrificing pieces]

and i have stockfish 5 in my phone so i am pretty sure there are no defenses

it didn't even give me a "good move" type of remark .it just failed me outright.

please look into it and take it down.

p.s :there are many such puzzles out there on this site

Hi vmsfinale,

does it win in the same number of moves?

The puzzles ask for the BEST move, not A winning move. I've failed many problems because of that, but I think this is ok. It forces us to look at all variations.

@xpj
it takes more moves but i expected at least a "good move" type of remark,
never mind