White can play 6. Nxf7 and if 6. ... Kxf7 then 7. O-O pins the f2 knight against your king and is winning for white. Obviously, if instead of 6. ... Kxf7 you play 6. ... Nxd1 then white takes your queen too which is about equal probably.
The reason it's a blunder is because you have a winning position after 5. ... Qf6, and your move (5. ... Nxf2) throws away that advantage.
Ok, thank you very much, I didn't see the castle move at all, I just thought if he takes with knight, I can take with king, and then still take queen or rook. Is there any way too see the whole branch in analysis tab or no?
6. Qe2 looks like the refutation of 5. ... Nxf2.
5. ... Nxf2 6. Qe2 Nxh1 7. Nc6 discovered check wins the Black Queen.
It's a case of counter activity. Yes, 5...Nxf2 wins the exchange, but it doesn't consider White's active reply: 6.Qe2, threatening the discovered attack Ne5-c6+, winning the black queen. Since Black has to defend against the stronger attack, White gets time to play d2-d4, followed by d4xc5 and the black knight in h1 can't escape, thus 2 minor pieces for the white rook = losing material.
6. Qe2 doesn't work. Black just castles and has too many threats. Qe2 creates problems down the e-file so Re8 is coming (after kicking the bishop on b5 (twice, if necessary) and then kicking the knight on e5). If white allows Nxh1 then Qh4+ is coming. White must be in big trouble there. I think definitely not 6. Qe2.
If White plays Qh5 there is a mate-in-one threat, so you cannot take the rook either.
With Qf6 you are both further attacking his king and defending the mate threat of Qh5.
Hey guys, I'm a real chess beginner, and for now I'm still playing against cpu opponents, and just checking my analysis after the match. For some reason this move is marked as a blunder, and I really can't understand why
I think this was a fork, and white can't do anything to avoid losing rook or queen. Am I wrong?