This was a 5-min blitz game on Chess.com and only a few seconds remained in both our clocks. It was the kind of position where one must realize the very imminent danger posed to him....It was White's move. There were factors that point to a possible win by black. Black controlled the F file particularly the F1 and F2 squares. White's E3 square is weak and ripe for a bishop check, pushing the white king into the H file. By then, the H5 square would be accessible to the black queen. White played 43. Be4? You can figure out the win and see if you even needed the H file.