[Event "The Ural Problemist-25"] [Site "?"] [Date "2018.??.??"] [Round "?"] [White "(5) Oleg Pervakov (RUS)"] [Black "?"] [Result "1-0"] [Annotator "1st/2nd Prize"] [SetUp "1"] [FEN "3K2R1/3Pp3/2k5/8/3P4/7p/b1PR2p1/4r3 w - - 0 1"] [PlyCount "33"] [EventDate "2018.??.??"] 1. c4 $3 ({Logical try} 1. d5+ $2 Bxd5 2. Rxd5 h2 3. Kc8 ({or} 3. Rg6+ e6 $1 4. Kc8 Ra1 {and so on}) 3... Ra1 $1 4. Rg6+ e6 $1 5. Rd6+ (5. Rxe6+ Kxd5 6. Ra6 $5 Rxa6 7. d8=Q+ Ke4 $1 8. Qh4+ Kf3 $11) 5... Kc5 6. Rg5+ e5 7. Rd5+ (7. Rxe5+ Kxd6 8. Ra5 $5 Rxa5 9. d8=Q+ Ke6 $1 10. Qg8+ Ke5 11. Qxg2 Rc5+ 12. Kd7 Rxc2 $11 ) 7... Kc4 8. Rg4+ e4 9. Rd4+ Kc3 10. Rg3+ e3 $1 (10... Kb2 $2 11. Rb4+ Kc1 12. d8=Q Ra8+ 13. Rb8 Rxb8+ 14. Kxb8 g1=Q 15. Qg5+ $18) 11. Rd3+ Kb2 $1 $11 {, and the black king hides in the shadow of the c2 pawn!}) (1. Rg6+ $2 Re6 $1 $11) 1... Bxc4 (1... g1=Q 2. Rxg1 Rxg1 3. Rxa2 Rg8+ 4. Kxe7 Rg7+ 5. Ke6 Rxd7 6. d5+ $18) 2. d5+ $1 ({The pin of bishop does not lead to success:} 2. Rc2 $2 g1=Q 3. Rxg1 Rxg1 4. Rxc4+ Kd5 $1 5. Rc8 $1 h2 6. Kc7 Rc1+ 7. Kb6 Rb1+ 8. Ka5 Ra1+ 9. Kb4 Rb1+ 10. Kc3 Rc1+ 11. Kd2 Rd1+ $1 12. Ke2 Re1+ $1 13. Kf2 Rf1+ $1 14. Ke2 Re1+ {perpetual check}) 2... Bxd5 3. Rxd5 $1 (3. Rg6+ $2 Re6 $19) (3. Ke8 $2 g1=Q 4. Rxg1 Rxg1 5. d8=Q Rg8+ $11) 3... h2 $1 {The best chance} (3... Kxd5 4. Ke8 $18) 4. Kc8 $1 Ra1 $1 5. Rg6+ e6 $1 6. Rd6+ $1 (6. Rxe6+ $2 Kxd5 7. d8=Q+ Kxe6 $11) 6... Kc5 7. Rg5+ e5 $1 8. Rd5+ $1 ({It is not possible to mate the black king after} 8. Rxg2 $2 Ra8+ $1 9. Kc7 h1=Q 10. Rc2+ Kb4 11. Rb6+ Ka3 $11) 8... Kc4 (8... Kc6 9. Rg6+ Kxd5 10. d8=Q+ $18) 9. Rg4+ e4 $1 10. Rd4+ $1 (10. Rxg2 $2 h1=Q 11. Rc2+ Kb3 $1 $11) 10... Kc3 (10... Kc5 11. Rg5+ Kxd4 12. d8=Q+ Ke3 13. Qb6+ $18) 11. Rg3+ e3 $1 12. Rd3+ $1 {For the 4th time repeating a step of the systematic movement} Kc4 $1 {The white pawn c2 is not on a board so the black king cannot hide!} (12... Kc2 13. Rxg2+ $18) 13. Rg4+ Kxd3 14. d8=Q+ Ke2 15. Rxg2+ Kf1 16. Qd5 $1 (16. Rxh2 $2 Ra8+ $11) 16... h1=Q 17. Qf3+ { Logical dumping of a white pawn precedes the systematic movement of four pieces.} 1-0