[Event "Lindau m1"] [Site "Lindau"] [Date "1948.??.??"] [White "Diemer, Emil Joseph"] [Black "Portz"] [Result "1-0"] [Annotator "http://chess-teacher.com"] [UTCDate "2023.06.11"] [UTCTime "08:12:35"] [Variant "Standard"] [ECO "D00"] [Opening "Blackmar-Diemer Gambit Accepted: Ryder Gambit"] [Source "https://lichess.org/study/wJ3GEtcZ/IlKyNy7N"] [Orientation "white"] 1. d4 d5 2. e4 dxe4 3. Nc3 (3. f3 e5 { [%cal Gd8d1] }) 3... Nf6 { [%cal Gf6e4] } 4. f3 exf3 5. Qxf3 Qxd4 6. Be3 { [%cal Gd4b4] } 6... Qg4 { [%cal Gg4f3] } (6... Qb4 { [%cal Gb4b2] } 7. O-O-O { [%cal Gc3b5,Gb5c7,Gd1d4,Gf3g3,Gg3c7] } 7... Bg4 { [%cal Gg4d1] } 8. Nb5 { [%cal Gb5c7] } 8... Bxf3 (8... Na6 { [%cal Gb5c7,Gb4b7] } 9. Qxb7 { [%cal Gb7a8,Gb5c7] } 9... Rb8 (9... Qe4 { [%cal Ge4a8] } 10. Qxa6 Qxe3+ 11. Kb1 { [%cal Gb5c7] } 11... Bxd1 12. Qc6+ Nd7 13. Qxa8+) 10. Qxb8+ Nxb8 11. Nxc7#) (8... e5 9. Nxc7+ Ke7 10. Qxb7 Qxb7 11. Bc5#) 9. Nxc7#) 7. Qf2 { [%cal Ge1c1,Gg1f3,Yg4d1] } 7... Ne4 8. Nxe4 Qxe4 9. O-O-O a6 10. Nf3 f6 { [%cal Gf3g5] } 11. Bd3 (11. Rd4 { [%csl Ge4] }) 11... Qa4 { [%cal Ga8h8] } 12. a3 (12. Qg3 { [%csl Rc7,Gd8][%cal Rg3c7] } 12... e5 13. Bg6+ hxg6 14. Qxg6+ Ke7 15. Bc5+ Ke6 16. Ng5#) 12... Nc6 13. Qd2 Be6 14. Rhe1 { [%cal Ge1e6] } 14... O-O-O 15. Bf2 { [%cal Ge1e6] } 15... Bf7 16. Bf5+ e6 { [%cal Gd8d2] } 17. Rxe6 Bxe6 (17... Rxd2 18. Re8# { [%cal Gf5c8,Ge8c8] }) 18. Bxe6+ Kb8 19. Qxd8+ Nxd8 20. Rxd8# { 1-0 White wins. } { [%cal Gf2a7] } 1-0