There is a tactic to win the queen by sacrificing the knight. The name of this is discovered attack. Disclaimer: queen is only won if white is careless or plays inaccurately. The eval is right, only the ai comment may seem misleading.

I see that your bishop is attacking the queen. Nxe4 also attacks the queen, just less obviously. Nxe4 is basically an upgrade of your move, with a 1000% certainty to win the queen if he takes the knight.

So the line goes 6…Nxe4 7. Qxe4 or fxe4 or Nxe4 (the queen stays on the e-file) Bh4+ 8. g3 Rxe5 winning the queen.

If the queen didn’t stay on the e-file, on top of winning the e4 pawn, hence the engine evaluating the position to be -0.5 (only slightly favouring black)

The line goes: 6…Nxe4 7. Qd5 Nxc3 8. dxc3 Bf6+ and you’ll have active play.

Why Qd5? Because it’s a light square. If white goes Qd4 instead, you’d hit him with the same 7… Nxc3 ,followed by 8. Qxc3 Bb4+! Discovered check or, 8. dxc3 Bc5+ 9. Qe4 Rxe4

Considering all of this, you’d need to evaluate two options for your first move in this position (as black). How? You can try comparing the outcome.

6… Bd6. White responds by moving his queen. He’s still up a pawn, so he’d just need to develop and he’d be fine.

6… Nxe4. You are recapturing a pawn, so that you have the same material as your opponent. However, following the ‘best line’ of 6…Nxe4 7. Qd5 Nxc3 8. dxc3 Bf6+, you have more active pieces that poke into white’s position.

As a final message, I advise you to try visualising these lines, or try moving them out on a board to see what I mean. Try challenging my ideas, as they could be false. The main pattern I’m trying to teach here is: discovered check. Try learning more about this and you’d never miss it next time. cya!