What are you talking about? Stockfish running on my machine found the move in no time at all.
Stockfish doesn't see everything
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Same, Stockfish found the mate in 9 starting with Rh5+ in approximately 1 second. Not sure what causes your result!
May 30, 2017
0
#4
He probably ran it on a phone or something.
Some other user here claimed to have beaten Stockfish, but it was on his iphone or something, and so it was very very weak.
A smartphone processor is just not that weak. Stockfish on a smartphone would still beat a GM. If someone is beating Stockfish or getting evaluation results like this it's most likely because some settings have been messed around with, or the phone is using 99% of its CPU on some uninterruptible task (not at all common and would probably have to be forced), etc.
Smartphones are as powerful as a mid-range computer desktop.. Unless it's a cheap/old school phone.
If you check the analyse position button on the board you posted, you'll see the mate in nine within seconds.
I think Stockfish can still run at 3000+ Elo on a Galaxy Smartphone.
It first says -13 then after a few seconds it says M9
May 30, 2017
0
#10
There are cases where Stockfish sees the fastest mate but doesn't see the best human technique, like using the Principle of the Opposition to Queen a Pawn. It's the best human move when it's too easy to make a mistake trying to go for the fastest possible mate. I had one game where the move that guaranteed my King would escort a Pawn to Queen - and it mated on the next move after Queening - was considered a blunder by Stockfish 8.
In another game, I missed an opponent's move where I fell behind in material, but if I let a N take my R, the N might be stuck in the corner and I just might be able to launch an attack which, with a weak opponent's move here and there helping, might be able to gain local material superiority and win the game - and surprisingly I did, throwing in a N sacrifice along the way. Stockfish thought my intentionally going down 5 pawn equivalents was a blunder compared with an alternative -1.29 pe. But the -1.29 would have kept me in positions where I'd never have much chance of winning and was not the best move! Here's that game. Follow my annotation and see if you agree that Stockfish's preferences were NOT what would most likely turn a losing game around against a human opponent:
If you give stockfish the following position:
Stockfish will tell you black is winning by over 13 points until you move to Rh5+.