can someone explain?

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Avatar of jam6435
i'm still not very good at chess so maybe theres something im missing, can someone explain why the eval says my queen trade is a blunder here? [Event "jam6435 vs aguyaman"] [Site "Chess.com"] [Date "2025-02-11"] [White "jam6435"] [Black "aguyaman"] [Result "1-0"] [WhiteElo "528"] [BlackElo "516"] [TimeControl "300"] [Termination "jam6435 won by resignation"] 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Bg5 f6 6. exf6 Nxf6 7. Ne5 c5 8. Qh5+ Nxh5 9. Bxd8 Kxd8 10. Nf7+ Kc8 11. Nxh8 Bg6 12. Nxg6 hxg6 1-0
Avatar of Nerwal

Because at the end of the operation, White has won a small amount of material, but has no piece out and one piece completely offside, while Black is ready for action with much better pieces. This is more important than the material gain.

Avatar of jam6435

much appreciated for the answer