[Event "34.Schlosspark-Open"] [Site "Wiesbaden-Biebrich"] [Date "2026.08.27"] [Round "1.20"] [White "Derr, Oleg"] [Black "Mehlen, Theodor"] [Result "1-0"] [WhiteElo "2166"] [BlackElo "1776"] [PlyCount "51"] [EventDate "2026.08.27"] [WhiteTeam "VSG 1880 Offenbach"] [BlackTeam "SC Matt im Park Ffm"] 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 O-O 6. O-O c6 7. Qc2 Nbd7 8. Nbd2 b6 9. e4 dxe4 10. Nxe4 Nxe4 11. Qxe4 Bb7 12. Bf4 Nf6 13. Qc2 c5 14. Be5 h6 15. dxc5 Be4 16. Qa4 bxc5 17. Rfe1 Qb6 18. Bxf6 Bc6 19. Qxc6 Qxc6 20. Bxe7 Rfe8 21. Ne5 Qc7 22. Nc6 Rac8 23. Bxc5 Red8 24. Nxd8 Qxc5 25. Nb7 Qxc4 26. Nd6 1-0