[Event "Shakhmaty (Riga)"] [Site "?"] [Date "1973.??.??"] [Round "?"] [White "Kasparian, G."] [Black "(Fortress 2)"] [Result "1/2-1/2"] [Annotator "2/3.Pr"] [SetUp "1"] [FEN "8/8/8/7B/6Nb/5k1N/p7/6K1 w - - 0 1"] [PlyCount "25"] [EventDate "1973.??.??"] [SourceDate "2000.10.30"] 1. Nh2+ Kg3 2. Bf7 $1 (2. Nf1+ $2 Kxh3 3. Bf7 Bf2+ $1 4. Kxf2 a1=Q 5. Be6+ Kh4 $19) 2... a1=Q+ 3. Nf1+ Kg4 (3... Kxh3 $4 4. Be6#) 4. Be6+ Kh5 5. Bd5 $1 Qd4+ 6. Kh2 Qe5+ (6... Qxd5 7. Nf4+ $11) 7. Kg1 Kg4 (7... Bf2+ 8. Kxf2 Qf5+ 9. Bf3+ $11) (7... Qd4+ 8. Kh2 {positional draw - perpetual threat of fortress}) 8. Bg2 $1 {fortress} Bg3 9. Kh1 Qd4 10. Ng1 Qh8+ 11. Nh3 Bf4 12. Kg1 Qd4+ 13. Kh1 1/2-1/2