[Puzzle Road] Unbelievable, I missed that! [23.07.2022]

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Kyu13

Hello everybody! Welcome to this fifth puzzle of the puzzle road!

You wished a more complicated puzzle and not anymore an endgame or a end-of-the-middlegame puzzle? Here is it!
A middlegame with a checkmate possibility for Black!

5/ Unbelievable, I missed that! (Topic: sacrifice)

It's not the most complicate puzzle you ever saw, but it's only a pre-puzzle of the next one! And the next one will be... horribly complicated!!!
Still, you can check the solution of this tactic with the sacrifice and all the needed explanations with this link: https://www.chess.com/blog/Kyu13/puzzle-road-unbelievable-i-missed-that-p5
Ciao, see you tomorrow for the ultra-difficult puzzle!
@Kyu13