Qb3#
If you find mate in 1, you’re a genius 🧠
Rxg8 and the queen block it then take the queen and black king can't take the knights because it protected by bishops and queen
Correct, it is a checkmate still BUT it's not a CHECKMATE IN ONE.
Green piece= correct piece
Red piece=incorrect
Green scribble=#
Red Cross=+
That makes no sense to me. But as far as I understand it, you are saying that queen can move to b7 and c7? But the queen is pinned to the king. It can't go there.
Qb3#
The queen is pinned, but it can still move along the diagonal because the black bishop is pinned.
Bg2#
So easy
You need to join your own course, mate, because Bg2 is not mate. It can be blocked by Qd6. It's EVENTUALLY mate, but it's not mate in one.
I'm not scrolling through 300+ pages but so far I haven't seen anyone say the right answer yet so I'll post it. It's Nb6+. The queen is pinned so you can't move it and there's no way to block or evade that check from the Knight.
A Pinned piece can still move along the pin line, which is why you can’t pin a queen. You can still move the queen along the diagonal. Also assuming you meant c6 since b6 doesn’t even check. C6 opens up c8 for the King, which was previously blocked by the Knight situated at a7. Or if you Did mean b6, that doesn’t check the king, and as such no checkmate.
A Pinned piece can still move along the pin line, which is why you can’t pin a queen. You can still move the queen along the diagonal. Also assuming you meant c6 since b6 doesn’t even check. C6 opens up c8 for the King, which was previously blocked by the Knight situated at a7. Or if you Did mean b6, that doesn’t check the king, and as such no checkmate.
I'll be honest, I just had a brain fart and completely droned out. Lol. Idk what I was thinking.

Rxg8 and the queen block it then take the queen and black king can't take the knights because it protected by bishops and queen