Annotated chess game

There was absolutely no defence. Obviously this token threat is a sporting gesture by Black to allow White to play the mate. For that, good on him.

A game black lost rather than white won. But look at black's army - three pieces never moved!

Agreed. Black went from ahead to losing the game but even when black was ahead, they needed to move more pieces.

Thank you for input

Black lost his way after having won material. But his reaction to the sudden turnaround tells me that loslo is a sportsman.