In this position GM Johann Hjartarson continued with 54. e7? and the game was drawn some 35 moves later.

Sadly for him he missed an extraordinary and spectacular win. 54. Qf7+!! Nxf7 55. exf7+ Kh7! (or 55… Kf8 56. Ng6+) 56. fxe8B!! when White’s three pieces will vanquish the black queen. If you promote to a queen or rook Black forces stalemate after either Qg2+ or Qh1+, while promotion to a knight fails to defend the rook.

A queen sacrifice followed by a very rare forced underpromotion to a bishop because a queen or rook would allow a counter queen sacrifice: amazing. This is exactly why we all love chess so much.

I’ve written a post about underpromotions here and you might also find this post of interest.