Analysis mode will find the eventual mate for black, depending on how long you leave it - e.g. currently for me it says mate in 19 moves starting with 55 ... e4.
However, if you then play hxg4 or fxg4, instead of stating the game is drawn, the analysis lines will still say M19, but bizarrely that it is *white* who should play 56 e4.
View the position here: https://www.chess.com/analysis/game/live/124583390669?tab=analysis&move=108
Analysis mode will find the eventual mate for black, depending on how long you leave it - e.g. currently for me it says mate in 19 moves starting with 55 ... e4.
However, if you then play hxg4 or fxg4, instead of stating the game is drawn, the analysis lines will still say M19, but bizarrely that it is *white* who should play 56 e4.