https://share.chessbase.com/SharedGames/game/?p=Utjr8xG1hG/dAN82ASMAzsDbsu5Ei+B5sFTUWDJdLTepqbu/XJgOsSjzwZGoCNAf

[Event ""] [White "2019 Costeff"] [Black "Bulletin Problemistic"] [Site ""] [Round ""] [Annotator ""] [Result "1-0"] [Date "2019.??.??"] [PlyCount "6"] [Setup "1"] [FEN "2qb4/Pr2p3/P7/6kp/1p3p2/2p1PK1P/P4PB1/4B2Q w - - 0 1"] 1. a8=Q $1 (1. axb7 Qxb7+ 2. e4 Qxa7 $10 )(1. exf4+ Kh4 2. a8=Q Qc6+ 3. Ke2 Qb5+ 4. Kd1 Qa4+ 5. Kc1 Qa3+ 6. Kc2 Qa4+ $10 )Qxa8 (1... Qc6+ 2. e4 )2. exf4+ Kh4 $1 ({ Otherwise the white king escapes to g3 with a technical win. For example: } 2... Kh6 3. axb7 Qa3 (3... Qxb7+ 4. Kg3 h4+ 5. Kh2 Qc7 6. Be4 Qxf4+ 7. Kg1 )4. Kg3 Bc7 5. Bf3 Qc1 6. Kg2 Qxf4 7. Bd1 Qe4+ (7... Qc1 8. Bb3 c2 9. h4 Qd1 10. Bxc2 Qxc2 11. Qh3 $18 )8. f3 Qg6+ (8... Qd3 9. Qg1 c2 10. Bxc2 Qxc2+ 11. Qf2 Qg6+ 12. Kh1 Qe6 13. Bxb4 )9. Kf1 c2 10. Bxc2 Qxc2 11. Qg2 $18 )3. Ke4 $3 { Threatening 4.f3 mate. Now there are four thematic variations, each with the black rook interfering with the black queen on adjacant diagonals: } -- (3... Rb5+ 4. Kd3 $1 { Interference on the a6-d3 diagonal. White wins. } )(3... Rb6+ 4. Kd4 $1 { Interference on the a7-d4 diagonal } e5+ 5. fxe5 Rd6+ 6. Kc5 Bb6+ 7. Kxb4 Rd4+ 8. Kxc3 Qc8+ 9. Bc6 Kg5 10. Bd2+ Rxd2 11. Kxd2 )(3... Rc7+ 4. Ke5 $1 { Interference on the b8-e5 diagonal } Rc5+ 5. Kd4 Rc4+ 6. Kd3 Rd4+ 7. Kc2 Rd2+ 8. Kc1 { wins } )(3... Rd7+ 4. Kf5 $1 { Interference on the c8-f5 diagonal } e6+ 5. Kg6 { wins } )1-0

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