This is surprising, but with a move 26. ... b5?? Black releases his winnings.lichess.org/RKd4yI6f/white#51Later I won in this game. But this was made possible thanks to another mistake of my opponent.
just wow ...b5?? was a real blunder..
@Ainzerous My opponent counted that the b4 (27. ... b4?) pawn is a passed pawn. But my king's movement 28. Kf1! ruined his plans.