But you do achieve something. It's the start of a reasonably complicated combination that wins you the black queen. If you are checking analysis be sure to follow it to the end of the line - otherwise it is useless.
i dont understand why this is better.
Sort:
I play white, Move 17.
I moved Bb3, but analysis says Bb7 is better. I dont understand why, black King just take it and i achive nothing.