When a gm can't see mate in 1

let's begin!

e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ We have French Defense: Winawer Variation on the board 6. bxc3 Ne7 7. Qg4 Qc7 Usually there are very sharp positions in this variation 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 Nbc6 11. f4 dxc3 White has a strong center now 12. Qd3 d4 13. Nxd4 Nxd4 14. Qxd4 Bd7 15. Qd6 Qa5 Here Levon wants to exchange queens because he has an extra pawn and Duda declines the queen exchange. But here Levon had a better move which is Rg1 and it helps white to prevent Rxg2 sacrifices later! 16. Qb4 Qd5 Levon is trying to exchange the queens again but Duda declines it 17. a4 Nf5, a4 was a mistake because c3 pawn was super dangerous and also his king is going to be attacked but he is not defending! Qxc3 is the best move here 18. Ba3?? What a blunder by Levon! Levon after thinking more than 5 minutes blundered simple checkmate in 1 which is Qd2, I think that Levon made this move to checkmate Duda Qf8 after Rxg2 but maybe he didn't even think that can get checkmated! 18.Qd2#

Try to focus on -
Always look what opponent is threatening
Be careful with your king
Exchanging queens when you have extra material is good
Solve tactics because you will improve