The ENGINES cannot find the winning move.. 23.Nh5+ ?

Prometheus_Fuschs

At least in chess.com, you'll notice it's sporting an older version of Stockfish plus, it is far slower than running it in your PC.

Laskersnephew

Stockfish 12 is plenty strong enough. On my 5-year-old, not very expensive desktop, Stockfish 12 found Nh5 in 29.5 seconds

ArtNJ

Yeah, I don't think it has anything to do with overall engine strength.  Rather, its something related to engine settings and pruning.  Even when they run the analysis using your home computer/phone, chess.com and lichess are selecting engine settings that will work for older machines & phones.  We would need an engine nerd to really explain it to us, but it certainly is interesting what a big difference the settings make in certain positions.