Eliminating the main defender of Black's kingside.

Underestimating White's attack.

Correct was 2...Be5 3.Qf2 Rf8! 4.Qh4 Rf7 with chances for a defence.

5...Kxh7 6.Qf7 with the inevitable 7 Rh1+ next.

White soon won the game.

Intending 2 Bxf7 to swap the main defender of Black's king.

1...Bxc4 2.Bxf7 Kxf7 3.Bg5 +-

2...Nc5 3.Bxf7 Kxf7 4.Bg5 Qh8 5.Be3! +-

Now in order to avoid 5 Rg7+, Black has to give up material.

With a strong attack and an extra exchange, White is winning.