[Event "The Problemist"] [White "Vlaicu Crisan & Árpád Rusz"] [Black "(Study 168)"] [Site ""] [Round ""] [Annotator ""] [Result "1/2-1/2"] [Date "2019.??.??"] [PlyCount "10"] [Setup "1"] [FEN "7k/2q2p2/P5p1/6K1/5PP1/p7/5Q2/8 w - - 0 1"] 1. f5 {a)} (1. a7 Qe7+ (1... Qd8+ )2. Kh6 Qf8+ 3. Kg5 a2 4. Qxa2 Qe7+ (4... Qd8+ )5. Kh6 Qh4# )Qd8+ ({b)} 1... Qe7+ 2. f6 Qe5+ 3. Kh4 (3. Kh6 a2 )g5+ 4. Kh3 (4. Kh5 a2 5. Qxa2 Qxf6 6. Qd5 Qg6# )Qd5 5. a7 a2 6. Qc5 {Q sacrifice} (6. Qd4 Qh1+ 7. Kg3 a1=Q {The white queen cannot reach f8.} )Qxc5 (6... Qh1+ 7. Kg3 a1=Q 8. Qf8+ Kh7 9. Qg7# )7. a8=Q+ Kh7 8. Qxa2 )2. f6 Qa5+ (2... Qd5+ 3. Kh6 Qh1+ 4. Kg5 Kh7 5. Kf4 (5. a7 Qh6# )Qd5 6. a7 a2 7. Qh2+ (7. Qh4+ )Kg8 8. Qh6 {Q sacrifice} Qd2+ (8... a1=Q 9. Qg7# )9. Kf3 (9. Kg3 )(9. Ke4 )Qxh6 10. a8=Q+ )3. Kh6 Qxa6 (3... a2 4. Qh2 Qd8 5. Kg5+ (5. Qxa2 Qxf6 6. g5 Qg7# )Kg8 6. Qxa2 )4. Qa7 (4. Qc5 Qa8 )Qxa7 5. g5 a2 {stalemate} 1/2-1/2