Online Win for a Real World Draw

Once in a while, the limitations of playing Chess online surfaces. 

Playing the Black pieces, I lost this 5-minute blitz game when my time ran out. In the last seconds of play, there was no way to claim a draw by clicking on a Claim Draw button nor was there, obviously, an arbiter to be hailed to the table to adjudicate the matter. A few moves earlier, realizing that my remaining time was insufficient to effect a win, I decided to exchange off my rook to arrive at a position where my opponent had only a minor piece. In this final position, White possessed no mating material. Yet, it was scored as a win for White. No chessplayer out there can win with the White pieces in this position.