https://i.ibb.co/20KQ6nFp/image-2025-06-12-084354803.png
I lost this puzzle

The guy means Qh4+. I have no idea how that became Qc5, h and c aren't even close to each other on any keyboard.
Qh4+ indeed is the solution, that's a pretty common pattern in puzzles.
Your analysis was bad to begin with. Nc5 doesn't win you material either, you just trade a knight for a bishop.

Levi Rossman has said if you can trade a knight for a bishop it gives you an advantage in the endgame because you're up a bishop. They aren't the same thing even if they count for the same number of points. It's preferable to have a bishop than a knight.

Levi Rossman has said if you can trade a knight for a bishop it gives you an advantage in the endgame because you're up a bishop. They aren't the same thing even if they count for the same number of points. It's preferable to have a bishop than a knight.
Without knowing the video, I'd assume he was probably joking. No way he really tried to suggest that a bishop against the knight is "up a bishop". A bishop is slightly better than a knight on average. It all depends on the position.
Qh4+ (and then 2. g3 Nxg3 3. hxg3 Qxg1) however wins an exchange and a pawn.
I screenshotted this and then accidentally refreshed the browser. The website loaded a new puzzle so I lost the answer. The goal is to gain a piece.
Your knight starts at e4.
If I move it to g3 or f2 I lose the knight.
If I move it to d2 I lose the knight and help the opponent develop their pieces.
If I move it to c3 I trade a knight for a knight. That doesn't win me material.
By moving it to c5 I trap the bishop. No matter what space it moves to next turn, it's dead. This gains me material. I think this is a good answer, and the best one I can see. I tried this and it said that wasn't the answer???
I considered moving my f8 bishop to c5 and then moving my knight to f2 to fork their queen and rook, but if I move my bishop this turn, they just take my knight with their knight to prevent the fork.
I could move my queen to put their king in check, but that develops the queen to early and doesn't win me anything. They just block with a pawn and I waste a turn.