Need to play Bg4 first. Then white has only one good option to protect queen. He will play f3. Then e4 * f3 , Bg2 * f3 and then Bg4 * Ng3. Night up for black. or sometimes instead of Bg2 * f3 , white will play Bf1 to protect Night and it will be a big mistake. Black will play f2+ and white queen is down.
RE: Chess Puzzle of the Day (Jun 15, 2021) | Problema de ajedrez del día (15-Jun-2021)