Threatens the fork Ng3 in addition to Nc3.

?? Careless move played almost immediately. Fair enough that this wins the rook for a bishop after Rxe2 Bxh2+ but Be3 was mate and would have been a fitting testament to Black's control of the dark squares.

Now there is a wholesale exchange of pieces which suits black as it increases the value of his material advantage.

This is a won ending for Black as the king and rook can easily stop the pawn. White's king is too far away to be of any use.

This just reduces the complications and give a position which black can win with almost no risk of loss. With an extra pawn on each wing White's task is hopeless.

White does not know whether to go to the left or the right...he cannot stop black promoting a pawn.

Black demonstrates which pawn he intends to Queen. White resigns.