Finales Y Temas nr. 122 Extra

Dedicated exclusively to the JT80- J. Copié and 25 years of Finales… y Temas; Jubilee:

16th International Internet Tournament - UAPA- 2021;

Organized by the Union of Argentinian Chess Problemists - UAPA-. Award Provisional.

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[Event "1/2.p. UAPA 16th Draw JT80 J.Copie"] [Site ""] [Date "2021.06.16"] [Round ""] [White "Sergey Osintsev"] [Black "[+0106.22h8a6"] [Result "1/2-1/2"] [SetUp "1"] [FEN "2R4K/2pP4/k7/2P1n3/1n6/3p4/8/8 w - - 0 1"] [PlyCount "36"] [EventDate "2021"] 
 1. d8=Q $1 (1. Ra8+ $2 1... Kb5 2. d8=Q Nf7+ 3. Kg7 Nxd8 4. Rxd8 4... Kxc5 $19) (1. d8=N $5 1... Kb5 2. Ra8 2... Na6 $1 3. Ra7 (3. Ne6 d2 4. Nd4+ Kc4 5. Nf5 Kc3 6. Ne3 Ng4 7. Nd1+ Kc2 8. Rxa6 8... Kxd1 $19) 3... d2 4. Rb7+ Kc4 5. Rb1 5... Nxc5 $19) (1. Rxc7 $2 1... Nf7+ $1 (1... Nbc6 2. d8=Q Nxd8 3. Rg7 d2 4. Rg1 Ndc6 5. Rd1 $11) 2. Kg7 Nd8 3. Rc8 Nbc6 4. Ra8+ Kb5 5. Ra2 Kc4 (5... Kxc5 $2 $11) 6. Kf6 6... Kc3 $11) 1... Nf7+ 2. Kg8 $1 (2. Kg7 $2 2... Nxd8 3. Rxd8 ( 3. Rxc7 3... Ne6+ $19) 3... Kb5 4. Kf6 4... Kxc5 $19) 2... Nxd8 3. Rxc7 $1 (3. Rxd8 $2 3... Kb5 $19) 3... Nd5 $1 (3... Ndc6 4. Rg7 $11 (4. Rd7 $2 4... Nd5 $1 5. Rxd5 5... Ne7+ $19) (4. Kf8)) 4. Rg7 (4. Rd7 $2 4... Nf6+ $19) (4. Rh7 $2) 4... Nc6 $1 (4... Nf6+ 5. Kh8 $1 5... Nc6 6. Rg3 (6. Rg6) 6... d2 7. Rg1 $11) 5. Rg3 $1 (5. Rg2 $2 5... Kb5 $1 6. Rd2 6... Kc4 $1 7. Kf7 7... Nc7 $1 $19) 5... d2 6. Ra3+ $3 (6. Rd3 $2 6... Nf6+ 7. Kg7 $1 (7. Kf8 Ne4 8. Ke8 Kb5) 7... Ne4 8. Kf8 8... Ka5 $3 9. Ke8 9... Kb5 $1 10. Kf8 (10. Rd5 $2 10... Nf6+ $19) 10... Kc4 11. Rxd2 Nxd2 12. Ke8 Kb5 13. Kd7 Nb3 (13... Nc4) 14. Kc7 Nba5 15. Kc8 Ka6 16. Kc7 Ka7 17. Kc8 Nb3 18. Kc7 Nbd4 19. Kc8 Nb5 20. Kd7 20... Kb7 $19) 6... Kb5 (6... Kb7 7. Rd3 Nf6+ 8. Kf8 Ne4 9. Ke8 $1 (9. Rd5 $2 9... Ka6 10. Rd3 10... Ka5 $1 11. Ke8 11... Kb5 $19) 9... Kc8 10. Kf8 $1 10... Kc7 11. Ke8 $11) 7. Rd3 Nf6+ 8. Kf8 (8. Kf7 $2 8... Ne5+ $19) 8... Ne4 9. Ke8 9... Ka6 $1 10. Ra3+ $1 (10. Kf8 $2 10... Ka5 $1 11. Ke8 11... Kb5 $19) 10... Na5 11. Rd3 $1 ( 11. Ra1 $2 11... Nc3 $1 12. c6 (12. Kd7 12... Kb5 $1 $19) 12... Kb6 $1 13. Kd7 13... Nxc6 $19) 11... Nc6 12. Ra3+ $1 (12. Kd7 $2 12... Nxc5+ $19 (12... Ne5+)) 12... Kb5 13. Rd3 Kb4 14. Rxd2 $1 (14. Kf8 $2 14... Kc4 15. Rxd2 Nxd2 16. Ke8 16... Kb5 $19) 14... Nxd2 15. Kd7 Kb5 16. Kc7 (16. Kc8) 16... Nb3 17. Kb7 Nba5+ 18. Ka8 $1 18... Kxc5 $11 {Ahogado!} 1/2-1/2

[Event "1.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021"] [Round ""] [White "Arpad Rusz"] [Black "[+1330.20d2d7"] [Result "1-0"] [SetUp "1"] [FEN "8/3k4/3r4/1P3P2/3b4/8/3K4/3Q4 w - - 0 1"] [PlyCount "25"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Qa4 $1 ({Thematic try:} 1. Qg4 $2 1... Bf6+ 2. Ke3 Rb6 3. Qa4 3... Ke8 $1 4. Ke4 4... Bd8 {fortress} 5. f6 Bxf6 6. Kd5 Be7 (6... Bg5) 7. Kc4 Bg5 8. Kc5 Be3+ 9. Kd5 Bg5 10. Kc5 (10. Qe4+ Be7 11. Kc4 11... Kd7 $11) 10... Be3+ $1 (10... Bd8 $2 11. Qe4+ Kd7 12. Qd5+ Kc8 13. Qxd8+ $1 {queen sacrifice} 13... Kxd8 14. Kxb6 Kc8 15. Ka7 $18) 11. Kd5 11... Bg5 {positional draw}) 1... Bb6+ 2. Kc3 Rf6 3. Qg4 $1 3... Kc8 $1 4. Kc4 4... Bd8 {A fortress? No!} 5. b6 $1 5... Bxb6 (5... Rxb6 6. f6+ $18) 6. Kd5 (6. Qg6 $2 6... Bd8 $1 $11 (6... Rxg6 $2 7. fxg6 $18)) 6... Bc7 (6... Bd8 7. Ke5 Be7 8. Qg7 Kd7 9. Qxf6 $1 9... Bxf6+ 10. Kxf6 Ke8 11. Kg7 $18) 7. Ke4 Ba5 8. Ke5 8... Bc3+ $1 (8... Bd8 9. Qc4+ Kd7 10. Qd5+ Ke8 11. Qxd8+ $1 { queen sacrifice} 11... Kxd8 12. Kxf6 Ke8 13. Kg7 $18) 9. Kd5 9... Ba5 { Is this a positional draw similar to that from the thematic try? No! Now the extra h-file proves to be useful for some threats by the queen.} 10. Qc4+ $1 10... Bc7 11. Qc3 $1 (11. Ke4 $2 11... Kd7 $11) 11... Rxf5+ 12. Kc6 Be5 13. Qh3 $1 $18 {Original cross leads to an unambiguous solution and clear thematic try. Only after 13 moves with 13.Qh3! it becomes clear why 1.Qa4!! and not 1.Qg4?} 1-0

[Event "2.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021.09"] [Round ""] [White "Michael Pasman"] [Black "[+0035.20f7a7"] [Result "1-0"] [SetUp "1"] [FEN "8/kP3K2/2P5/1n6/5N2/8/3b4/1N6 w - - 0 1"] [PlyCount "21"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Ne6 $1 { Prevents Nd4 and moving the knight to better place} (1. Nxd2 $2 1... Nd4 $11) 1... Nd6+ (1... Bf4 2. Ke8 Bb8 3. Kd7 Nd6 4. Nc5 $18) (1... Be1 2. Ke7 $18) ( 1... Bb4 2. Ke8 $1 2... Nd6+ 3. Kd7 3... Nxb7 {is as main line}) 2. Ke7 2... Bb4 {Moving the bishop from an attack and preparing for the capture of b7 pawn} (2... Nxb7 3. Nxd2 Na5 4. c7 $18) 3. Kd7 $1 3... Nxb7 4. Na3 $3 { First sacrifice on a3 (which black can't accept)} (4. c7 4... Nd6 $11 { with Ba5 threat}) 4... Nd6 (4... Bxa3 5. c7 Nd6 6. Nd4 $1 6... Kb7 7. Nb5 $1 7... Nc8 8. Nxa3 Nb6+ 9. Kd8 $18) 5. Nd4 $1 (5. Nc7 $2 5... Bxa3 $11) (5. Nc2 $6 5... Nc4 $1 6. Nxb4 6... Ne5+ $13) 5... Ka8 $1 ({Still a3 untouchable} 5... Bxa3 6. c7 $1 6... Kb7 7. Nb5 $18) (5... Kb6 6. c7 Bxa3 7. Nf5 $1) 6. Ndb5 $1 ( {Thematic try :} 6. Nab5 $2 6... Nc4 $1 7. Nc7+ Ka7 8. Ndb5+ 8... Kb6 $1 9. Nd5+ 9... Kc5 $3 (9... Kxb5 $2 10. c7 $18) 10. c7 10... Kxd5 $11) (6. c7 6... Ba5 $1 $11) 6... Nxb5 7. Nxb5 Ba5 8. Kc8 Bb4 9. Na3 $3 {Again - kni ght sacrifice on the same square. This time unexpected move with the knight backward. Looks strange, but I didn't find any study in this basic position. This is the only winning move. Other moves will only waste time and White needstoreturntothisposition} (9. Nd4 $2 9... Be1 10. Nb5 10... Bb4 $11) (9. Kc7 $5 9... Ba5+ 10. Kc8 (10. Kd7 10... Kb8 $11) 10... Bb4 $11) (9. Kd7 $5 9... Ba5 $11) 9... Be1 ({Again - the knight is untouchable} 9... Bxa3 10. Kd7 $1 10... Bd6 11. Kxd6 Kb8 12. Kd7 $18) 10. Kd7 $1 (10. Kd8 $2 10... Ba5+ {returns back} 11. Kc8 $11) (10. Nc4 $2 10... Bg3 11. Kd7 11... Bb8 $1 $11) 10... Ba5 (10... Bg3 11. Nb5 $1 $18 {and Nd6}) 11. Nc4 $18 {Surprising recurring knight sacrifice on square a3. The active black play and the thematic try further   enhance the study !} 1-0

[Event "3.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021.12.22"] [Round ""] [White "Oleg Pervakov"] [Black "[+0005.21e7g4"] [Result "1-0"] [Annotator "Copie"] [SetUp "1"] [FEN "4N3/2N1K1P1/7n/8/6k1/6p1/3P4/8 w - - 0 1"] [PlyCount "19"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN [#]} 1. Nd5 (1. Nf6+ $2 1... Kh4 $1 2. Ne6 Nf5+ 3. Kf7 g2 4. Nd4 Nxg7 5. Ne2 5... Nf5 $11) 1... Nf5+ (1... g2 2. Ne3+) 2. Ke6 $1 ({Thematic try} 2. Kf6 $2 2... Nxg7 3. Nxg7 Kf3 4. Nf4 4... Ke4 $1 { zz} 5. Nge6 5... g2 $1 {zz} 6. d3+ Ke3 7. Nxg2+ 7... Kxd3 $11) (2. Kf7 $2 2... Kf3 $1 3. Ne3 (3. g8=Q Nh6+) 3... Nxg7 4. Nxg7 4... Ke2 $11) 2... Nxg7+ 3. Nxg7 Kf3 4. Nf4 $1 4... Ke4 $1 (4... Kxf4 5. Nh5+ Ke4 6. Nxg3+ Kd3 7. Nf1 $18) 5. Kf6 $1 {zz} 5... g2 $1 6. Nge6 $1 {zz} 6... g1=Q (6... g1=N 7. d3+ $1 (7. d4 $2 7... Nf3 8. d5 Ne5 9. d6 Nd7+ 10. Ke7 10... Nb6 $1 11. Kd8 11... Nc4 $11) 7... Ke3 8. d4 Nf3 9. d5 $18) 7. Ng5+ Kxf4 (7... Kd4 8. Nf3+ $18) 8. Nh3+ Ke4 9. Nxg1 Kd3 10. Nf3 $18 {Original Zugzwang -position with hanging knight in the solution and in the try. The moves 4.Nf4!! and 5.Kf6!! with zugzwang are excellent.} 1-0

[Event "4.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021.01.07"] [Round ""] [White "Sergey Osintsev"] [Black "[+0313.10f6a6"] [Result "1-0"] [SetUp "1"] [FEN "4B3/4P3/k4K2/8/8/8/4n3/4r3 w - - 0 1"] [PlyCount "39"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Bb5+ $1 1... Kxb5 2. e8=Q+ Kc4 3. Qe4+ (3. Qe3 $2 3... Rf1+ $1 $11) (3. Qa4+ $2 3... Kd3 $1 $11) 3... Kc3 4. Qe3+ Kc2 5. Ke7 $3 (5. Ke5 $2 5... Nc1 (5... Ng1) (5... Nd4) (5... Nf4) 6. Qxe1 6... Nd3+ $11) (5. Ke6 $4 5... Nd4+ $19 (5... Nf4+)) (5. Kf5 $2 5... Rf1+ $1 $11) 5... Kd1 6. Qd3+ Kc1 7. Kf6 $1 7... Ng1 (7... Rf1+ 8. Ke5 Re1 9. Kf5 $18) 8. Kf5 (8. Qc3+ $2 8... Kd1 9. Qd3+ $11) 8... Ne2 (8... Rd1 9. Qc3+ Kb1 10. Ke4 $1 10... Ne2 11. Qb3+ Kc1 12. Qc4+ Kd2 13. Qa2+ Ke1 14. Qa5+ $1 14... Kf1 15. Qf5+ Kg1 16. Qg4+ Kf2 17. Qf3+ Ke1 18. Ke3 $18) 9. Kg5 $1 (9. Kg4 $5 9... Rg1+ $11) 9... Rg1+ (9... Ng1 10. Kf4 Ne2+ 11. Kf3) 10. Kf6 $3 10... Rf1+ 11. Ke5 Re1 12. Kf5 $1 12... Rf1+ (12... Ng1 13. Kf4 Ne2+ 14. Kf3 $18) 13. Ke4 Re1 (13... Rf6 14. Qc4+ Kd2 15. Qa2+ Kc3 16. Qa1+ $18) 14. Kf3 $1 14... Ng1+ 15. Kf2 Rd1 16. Qc3+ Kb1 17. Ke3 Rc1 18. Qb3+ Ka1 19. Kd2 $18 {win} 19... Rb1 20. Qa3# { The white king must avoid potentially damaging knight forks. "Ke7!!!" only to return to f6 a few moves later looks very paradoxical.} 1-0

[Event "1.hm. UAPA 16th (tt) JT80 J.Copie"] [Site "16th UAPA"] [Date "2021"] [Round ""] [White "Itay Richardson"] [Black "[+0032.12d4f5"] [Result "1-0"] [SetUp "1"] [FEN "8/2p4N/1pbP4/5k2/3K4/8/8/7N w - - 0 1"] [PlyCount "29"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Ng3+ (1. dxc7 $2 1... Bb7 2. Nf8 (2. Ng3+ Ke6 3. Nf8+ 3... Kd6 $10) 2... Kf6 3. Ng3 Ke7 4. Ng6+ 4... Kd7 $10) 1... Ke6 2. Nf8+ $1 (2. dxc7 $2 2... Kd7 $10) 2... Kf7 ({Main} 2... Kxd6 3. Nf5# $1) 3. dxc7 Bb7 4. Nd7 (4. Nh7 $2 4... Ke6 $10 { White can't stop the Black king from capturing the pawn}) 4... Ke7 {/e6} 5. Nxb6 Kd6 6. Na8 $1 ({Thematic try:} 6. Nd5 $2 6... Kd7 7. Kc5 Bxd5 8. Kb6 8... Be6 $10) 6... Kd7 7. Kc5 Bxa8 8. Kb6 Bd5 9. Nf5 Bc4 ({Main} 9... Be6 10. Kb7 Ke8 11. Ng7+ $18) 10. Nd6 $1 (10. Ne7 $2 10... Ba6 $1 $10) 10... Ba6 $1 11. Nb7 (11. Kxa6 $2 11... Kxc7 $10) 11... Bf1 {/e2} (11... Kc8 12. Nc5 Bf1 13. Ne4 $18 {transposes to the main line}) 12. Nc5+ Kc8 13. Ne4 {threatening Sd6+} 13... Ba6 14. Nf6 Bb5 ({Main} 14... Bc4 15. Ne8 $18 {There is no way to stop Sd6}) 15. Nd5 $18 {There is no way to stop Se7. There is no way to stop Se7 A nice study with mate motif in the center. Knight's journey and sacrifice. A lot of content. I liked 6.Na8!} 1-0

[Event "2.hm. UAPA 16th (tt) JT80 J.Copie"] [Site "Eiiiiceoeey"] [Date "2021"] [Round ""] [White "Valery Kalashnikov"] [Black "[+3002.20b5e7"] [Result "1-0"] [SetUp "1"] [FEN "4q3/1P2k2N/2P5/1K6/8/8/N7/8 w - - 0 1"] [PlyCount "25"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Nb4 $1 1... Kd6 $1 (1... Qb8 2. Nd5+ Ke6 3. Kb6 Qg8 4. Ka7 Qg1+ 5. Nb6 Qa1+ 6. Kb8 Qh8+ 7. Nc8 Qe8 8. c7 $18) (1... Qh5+ 2. Kb6 Qe5 3. Nd5+ Kf7 4. Nhf6 Qb2+ 5. Ka7 Qd4+ 6. Kb8 $18) 2. Nf6 Qe2+ 3. Kb6 3... Qf2+ $1 4. Ka6 Qf1+ 5. Ka7 Qa1+ 6. Kb8 Qxf6 7. c7 Kc5 8. c8=Q+ $1 ({ Try} 8. Na6+ $6 8... Kb5 $1 9. c8=Q Kxa6 10. Ka8 Qf3 11. Qc4+ 11... Ka5 $1 $11 ({Not} 11... Kb6 $2 12. Qb3+ $1 $18 {Van Vliet 1888 Year})) 8... Kxb4 9. Qd7 $1 9... Kc5 (9... Qe5+ 10. Kc8 Qc5+ 11. Kd8 Qa5+ 12. Ke8 Qh5+ 13. Qf7 Qb5+ 14. Kf8 $18) 10. Qa4 $1 10... Kb6 11. Ka8 11... Qf3 {Van Vliet 1888 Year:} 12. Qb3+ $1 12... Qxb3 13. b8=Q+ $18 {Nice start with 1.Nb4! Pleasant and gamelike miniature leads in a position by Van Vliet. The thematic try is 8.Na6?! which later fails with 11.Ka5! enhances the study.} 1-0

[Event "3.hm. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021"] [Round ""] [White "Janos Mikitovics & M. Garcia"] [Black "Twin: A"] [Result "1-0"] [SetUp "1"] [FEN "1N6/k7/4p1n1/8/7P/7K/8/2N5 w - - 0 1"] [PlyCount "15"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN A) Diagram B) bNg6=>e5} 1. Nc6+ $1 (1. h5 $2 1... Nf4+ $1 {fork} 2. Kg4 2... Nxh5 $11 {active sacrifice}) (1. Nd7 $2 1... Nxh4 {active sacrifice} 2. Kxh4 2... e5 $3 {active sacrifice} 3. Nf6 3... e4 $1 {active sacrifice} 4. Ng4 4... e3 $1 $11 {active sacrifice}) 1... Kb6 2. Nd4 Kc5 3. Nce2 $3 {White is forbidden to accept passive sacrifice on e6!} (3. Nxe6+ $2 3... Kd6 $11) ({Thematic try} 3. Nf3 $2 3... Nxh4 $3 {active sacrifice } (3... Kc4 $2 4. Kg3 $1 4... Nxh4 5. Nxh4 $3 5... e5 6. Nf5 e4 7. Ne3+ $18) 4. Nxh4 4... e5 $1 5. Nf5 e4 6. Kg3 6... e3 $11) 3... Nxh4 (3... Kc4 4. h5 $18) 4. Kxh4 Kc4 5. Kg3 $3 5... e5 6. Nf5 $1 (6. Nc2 $2 6... Kd3 $1 $11 {skewer} (6... e4 $2 7. Ne3+ $18 {main line})) 6... e4 7. Ne3+ $1 (7. Kf2 $2 7... e3+ $1 $11 { active sacrifice}) 7... Kd3 8. Kf2 $18 { Keywords: passive and active sacrifices; fork; Troitsky line} 1-0

[Event "3.hm. UAPA 16th (tt) JT80 J.Copie"] [Site "-"] [Date "2021"] [Round ""] [White "Janos Mikitovics, & Mario G. Garcia"] [Black "Twin: B"] [Result "1-0"] [SetUp "1"] [FEN "1N6/k7/4p3/4n3/7P/7K/8/2N5 w - - 0 1"] [PlyCount "23"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. Nc6+ $1 ({Thematic try} 1. Nd7 $2 { active sacrifice (11th WCCT)} 1... Nxd7 $1 (1... Ng6 $2 2. Nc5 Nxh4 3. Kxh4 e5 4. Ne4 $18 {Troitsky line}) 2. h5 Kb7 (2... e5 $2 3. h6 $1 3... Nf6 4. Kh4 $1 4... Kb6 5. Kg5 Nh7+ 6. Kg6 Nf8+ 7. Kf5 $18) 3. h6 Nf8 4. Kg4 Kc7 (4... e5 $2 5. Kf5 e4 6. Kxe4 $18) 5. Kg5 5... e5 $1 6. Kf6 6... e4 $1 (6... Kd7 $2 7. Nd3 e4 8. Nc5+ $18 {fork}) 7. Kf7 Nh7 8. Kg7 Ng5 9. Kg6 Ne6 10. Kf5 (10. h7 10... Nf8+ $18 {fork}) 10... Nf8 11. Kxe4 Kd7 12. Kf5 12... Ke7 $11) 1... Nxc6 2. h5 $1 (2. Kg4 $2 2... Ne5+ $1 {switchback} 3. Kg5 (3. Kf4 3... Ng6+ $18 {fork}) 3... Nf3+ $11 {fork}) (2. Nd3 $2 2... Ne7 $1 (2... e5 $2 3. Nf2 $1 $18) 3. h5 3... Ng8 $1 4. Kh4 4... Kb7 {/b6} 5. Kg5 5... Kc7 {/c6} 6. Kg6 Kd6 7. Kg7 Ne7 8. Nf4 Nf5+ 9. Kf6 Kd7 10. Nxe6 Nh6 11. Nf4 Ng4+ 12. Kg5 Ne5 13. Ng6 Nf7+ 14. Kf6 Nh6 15. Ne5+ Ke8 16. Kg6 Ng8 17. Kg7 Ne7 18. h6 18... Nf5+ {fork}) 2... Ne5 {switchback} 3. Kg3 $1 (3. Kh4 $2 3... Nf7 $11) 3... Kb6 (3... Nf7 4. Kf4 $1 ( 4. Nd3 $2 4... e5 $1 $11) 4... Kb6 5. Nd3 $18 {main line}) 4. Kf4 Nf7 5. Nd3 Kc7 6. Ne5 $1 {Umnov} 6... Nh6 7. Kg5 $1 (7. Ng4 $2 7... Nf7 $1 8. Ne5 $18 { loss of time}) 7... Nf5 8. Kf6 $1 (8. Kg6 $2 8... Kd6 9. Kf6 Kd5 10. Nf3 Ke4 11. Nh4 {active sacrifice} 11... Nh6 $1 12. Kg5 12... Nf7+ $11 (12... Ng8 $2 13. Ng6 $1 13... e5 (13... Kd5 14. Ne7+ $18 {active sacrifice}) 14. Ne7 $3 $18 {active sacrifice})) 8... Kd6 (8... Kd8 9. Kf7 $1 $18 (9. Kxe6 $2 9... Ng7+ $11 {fork}) (9. Nc4 $2 9... Ke8 $1 $11 (9... Kd7 $2 10. Kf7 $18))) 9. Nc4+ $1 ({ Thematic try} 9. Ng4 $2 9... Kd5 $1 (9... Kc5 $2 10. Nh2 $3 10... Kd4 11. Nf1 $18 {main line}) 10. Nh2 Ke4 11. Kg5 11... Nd6 $1 (11... Ke5 $2 12. Nf1 Kd6 13. Kf6 $1 (13. Ng3 $2 {/Se3? active sacrifice} 13... Ke7 $1 $11) 13... Kd7 14. Kf7 $18) 12. Ng4 12... Kd4 $3 (12... Nf5 $2 13. Nf6+ Ke5 14. Ne8 Ke4 15. Ng7 $3 $18 {active sacrifice}) 13. Kf6 13... Nf5 $1 14. Nf2 14... Ke3 $1 $11 (14... Kd5 $2 15. Nh1 $3 15... Ke4 (15... Kd6 16. Ng3 $3 $18 {active sacrifice}) 16. Ng3+ $3 $18 {active sacrifice / main line})) 9... Kc5 (9... Kd7 10. Kf7 $18 (10. Ne5+ $2 10... Ke8 $11)) 10. Nd2 $1 ({Thematic try} 10. Ne5 $2 10... Kd5 $1 (10... Kd4 $2 11. Nc6+ $1 11... Ke4 12. Kg5 Kd5 13. Ne7+ $18 {active sacrifice}) ( 10... Kd6 $2 11. Nc4+ $1 {main line}) 11. Ng6 11... Ke4 $1 (11... Kd6 $2 12. Nh4 $3 $18 {active sacrifice}) 12. Nh4 $1 {active sacrifice} 12... Nh6 $1 13. Kg7 13... Ng4 $11) 10... Kd4 11. Nf1 $1 ({Thematic try} 11. Nb3+ $2 11... Ke3 ( 11... Ke4 $2 12. Kg5 Kd5 13. Nd2 Ke5 14. Nf1 Kd6 15. Kf6 Kd7 16. Kf7 Kd6 17. Ne3 $3 $18 {active sacrifice}) 12. Nc5 12... Kf4 $1 13. Nxe6+ Kg4 14. Ng7 14... Nh6 $1 15. Kg6 Ng8 16. Kf7 Nh6+ 17. Kf6 17... Nf5 $3 $11 {active sacrifice}) ( 11. Kxe6 $2 11... Ng7+ $1 $11 {fork} (11... Nh6 $2 12. Kf6 Ke3 13. Kg5 $3 13... Nf7+ 14. Kg6 Kf4 15. Nc4 $1 15... Nh8+ $1 16. Kf6 $3 (16. Kg7 $2 16... Nf7 17. Kg6 $1 17... Nh8+ 18. Kf6 {loss of time}) 16... Nf7 $1 {active sacrifice} 17. Ne3 $3 $18 {active sacrifice})) 11... Ke4 12. Ng3+ $18 {active sacrifice [Keywords: - the theme of the 11th WCCT; - Task = mutual active sacrifices; - forks; - switchback - Troitsky line. .]} 1-0

[Event "5.hm. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021"] [Round ""] [White "Paavo Tikka"] [Black "[+0003.41f3g8"] [Result "1-0"] [SetUp "1"] [FEN "6k1/p5P1/7P/n7/P7/5K2/P7/8 w - - 0 1"] [PlyCount "49"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN Duel wK vs bN} 1. Ke4 $1 1... Nc6 2. Kd5 (2. Kf5 $2 2... Kf7 $11) 2... Nb4+ $1 { Knight must threat to capture a2-pawn to stop white attack on the Q-side.} ( 2... Ne7+ 3. Kd6 Nf5+ 4. Kc6 Nxh6 5. a5 Kxg7 6. Kb7 $18) 3. Ke6 $1 {!} (3. Kc5 $2 {?} 3... Nxa2 4. Kc6 (4. Kb5 4... Nc3+ {!}) 4... Nc1 {!} 5. Kb7 (5. a5 Nb3 6. a6 6... Nd4+ $1 7. Kb7 7... Nb5 $11) 5... a5 6. Kb6 Nb3) (3. Ke5 $2 3... Kf7 $11) 3... a5 $1 {! Prevents white gaining tempo for Q-side attack with a4-a5.} (3... Nxa2 4. Kf6 Nc3 5. Kg6 $18) (3... Nd3 4. a5 $1 4... a6 5. a3 Nc5+ (5... Nb2 6. Kd5) 6. Ke7 {!} 6... Ne4 (6... Nb7 7. Kf6 Kh7 8. Kf7 Nd8+ 9. Ke7 Nc6+ 10. Kf8 $18) 7. Kd7 Nf6+ 8. Kc6 Kh7 9. Kb6 Kxh6 10. Kxa6 Kxg7 11. Kb7 $18) 4. Ke7 $1 (4. Kf6 $2 {<main try>} 4... Nd3 $1 { White is in Zugzwang and can't gain tempo anymore.} 5. Ke7 5... Nc5 $1 6. Kf6 Nd3 7. Ke6 Nc5+ 8. Ke7 8... Ne4 $1 9. Ke6 Nc5+ 10. Kf6 10... Nd3 $11) (4. a3 $2 {Now black knight can safely defend a5 from b3.} 4... Nd3 $1 5. Kd5 Kf7 6. Kc4 Nc1 7. Kb5 7... Nb3 $11) 4... Nd5+ 5. Kd6 (5. Kd7 {wins also because} 5... Nb6+ (5... Kf7 6. Kc6 $18 {wins}) 6. Ke6 {leads to main line}) 5... Nb6 $1 { By threatening to capture a4 black can still stop whites Q-side attack. Capturing a2 is a tempo slower.} (5... Nc3 {<main>} 6. Ke6 Ne4 (6... Ne2 7. Kf6 Nf4 8. h7+ $1 8... Kxh7 9. Kf7) 7. Kf5 $1 (7. Kd5 $2 7... Nc3+ 8. Ke6 { delays win}) 7... Nd6+ 8. Kg6 $18 {and mate in 1}) (5... Nb4 6. Kc5 Nxa2 7. Kb5 Nc3+ 8. Kxa5 Kh7 9. Kb4 Nd5+ 10. Kc5 Ne7 11. a5 Kxh6 12. a6 Kxg7 13. a7 $18) 6. Ke6 (6. Kc5 $2 6... Nxa4+ 7. Kc4 Nb6+ 8. Kb5 Nd5 9. Kxa5 Ne7 10. a4 Kh7 11. Kb6 Kxh6 12. Kb7 Kxg7 13. a5 Nf5 14. a6 14... Nd6+ $11) 6... Nc4 (6... Nxa4 7. Kf6 $18) 7. Kf6 Kh7 8. Kf7 Ne5+ 9. Kf8 $1 (9. Ke6 $2 9... Ng4 10. Kd6 Nxh6 11. Kc6 11... Kxg7 $11 {draws because black is one tempo ahead of the main line}) 9... Ng6+ 10. Ke8 Ne5 11. Kd8 Ng4 12. Kc7 Nxh6 13. Kb6 Kxg7 14. Kxa5 Kf6 15. Kb6 Ke6 16. a5 Nf5 (16... Kd7 17. a6 $1 {!} 17... Kc8 18. a7 $18) 17. a6 Nd6 18. a7 Nc8+ 19. Ka6 (19. Kb7 {also}) 19... Nxa7 20. Kxa7 Kd6 21. Kb6 {!} 21... Kd7 22. Kb7 Kd6 23. a4 Kc5 24. a5 Kb5 25. a6 $18 1-0

[Event "sp.c, UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021"] [Round ""] [White "Poul Rewitz"] [Black "[+0004.21f4a5"] [Result "1-0"] [SetUp "1"] [FEN "4N3/8/8/k4P1P/2p2K2/8/8/3n4 w - - 0 1"] [PlyCount "25"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN [#]} 1. Kf3 $1 ({Try:} 1. Ke4 $2 1... c3 2. Kd3 2... Kb4 $1 3. h6 Kb3 4. h7 c2 5. Kd2 Kb2 6. h8=Q+ Kb1 7. Qa1+ Kxa1 8. Kc1 (8. Kxc2 8... Ne3+ $11) 8... Ka2 $1 9. f6 9... Kb3 $1 $11) (1. f6 $2 1... c3 2. f7 c2 3. f8=Q c1=Q+ 4. Kf5 Ne3+ 5. Kg6 5... Qb1+ $11 ({or} 5... Qc2+ $11) (5... Qg1+ $2 6. Kf7 $1 $18)) (1. h6 $2 1... c3 2. h7 c2 3. h8=Q 3... c1=Q+ $11 ) (1. Nd6 $2 1... c3 $11) 1... c3 2. Ke2 c2 3. Kd2 Kb4 4. Kxc2 (4. h6 $2 4... Kb3 5. h7 {(see the 1.Ke4 ... 5.Kd2 line)}) 4... Ne3+ 5. Kd3 (5. Kd2 $2 5... Nxf5 6. Ng7 Nd6 ({or} 6... Nh6 7. Ke3 7... Kc5 $11) (6... Nxg7 $2 7. h6 $18) 7. Ke3 Kc5 8. Kf4 Nf7 9. Kf5 Kd6 10. Kf6 Nh6 11. Kg6 11... Ng4 $11) 5... Nxf5 6. Ng7 $3 (6. Ke4 $2 6... Ng3+ $11) 6... Nxg7 (6... Nh6 7. Ke4 ({or} 7. Kd4 $18) 7... Kc5 8. Ke5 $18) (6... Nd6 7. Kd4 $18 ({or} 7. Ne6 $18)) 7. h6 Ne6 ({or}  7... Nh5 8. h7 Nf4+) 8. h7 Nf4+ 9. Ke4 Ng6 10. Kf5 Nh8 11. Kf6 Kc5 12. Kg7 Kd6 13. Kxh8 $18 1-0

[Event "sp.c, UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021.09.25"] [Round ""] [White "Pavel Arestov"] [Black "[+0004.21a5d2"] [Result "1-0"] [SetUp "1"] [FEN "8/2p1N3/8/K7/8/5P2/1P1k4/1n6 w - - 0 1"] [PlyCount "39"] [EventDate "2021"] 
 {Sec. A.1.Studies up to 8 pieces -WIN} 1. f4 1... Kd3 $1 (1... Ke3 2. f5 Nd2 3. f6 Nc4+ 4. Ka6 Ne5 5. b4 $18) 2. f5 Nd2 3. f6 Nc4+ 4. Ka6 $1 (4. Kb5 $2 4... Ne5 $1 5. Kc5 5... Nd7+ $11) 4... Nd6 $1 5. Nc8 $1 (5. Nf5 $2 5... Nf7 $1 6. Kb7 6... Ke4 $11) 5... Nf7 $1 (5... Nxc8 $2 6. f7 $18) 6. Kb7 c5 7. Kc7 $1 (7. Kc6 $2 7... Kd4 $1 8. Nd6 8... Ne5+ $11) 7... Kd4 8. Nd6 8... Nh8 $1 (8... Ne5 9. b3 $1 9... Kd5 10. Nc4 $1 10... Nf7 11. Kd7 $18) (8... Nh6 9. Nf5+ $1 9... Nxf5 10. f7 $18) (8... Ng5 9. Kc6 $1 9... c4 10. Kb5 c3 11. bxc3+ Kxc3 12. Kc5 Kd3 13. Kd5 Ke3 14. Ke5 $18) 9. Kc6 $1 9... c4 10. Kc7 $3 {switchback} (10. Kd7 $2 10... Kd5 {zz} 11. Kc7 11... Ng6 $1 $11) 10... Kc5 $1 (10... Kd5 11. Kd7 {zz } 11... Ng6 12. Nc8 Ke5 13. f7 Kf6 14. Ke8 $18) 11. Nf5 $1 (11. Kd7 $2 11... Kd5 {zz} 12. Kc7 12... Ng6 $11) 11... Kd5 (11... Nf7 12. Kd7 Kd5 13. Ke7 $18) 12. Ne3+ (12. Kd7 $2 12... Ke5 $11) 12... Kd4 13. Ng4 Ke4 14. Kd7 $3 ({Try:}  14. Kd6 $2 14... Kf5 $1 15. Ne3+ Kxf6 16. Nxc4 16... Nf7+ $1 17. Kd7 17... Ng5 $1 18. b4 18... Ne6 {/e4=}) 14... Kf5 (14... Kf4 15. Nh6 Kg5 16. Ng8 Kf5 17. Ke7 Ke5 18. Nh6 $1 18... Ng6+ 19. Kf7 Nf4 20. Ng4+ Kf5 21. Ne3+ $18) 15. Ne3+ Kxf6 16. Nxc4 Ng6 (16... Nf7 17. b4 $18) 17. b4 Nf8+ 18. Kd6 Ne6 19. b5 Nd4 20. b6 $18 1-0

[Event "1.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021.09"] [Round ""] [White "Michael .Pasman"] [Black "[+0035.02f3e6"] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/6n1/4k3/N7/p7/N1p2K2/8/1b6 w - - 0 1"] [PlyCount "33"] [EventDate "2021"] 
 {Sec. A.2.Studies up to 8 pieces -DRAW} 1. Nb7 $3 { First white forces black to move the pawn to c2} ({Thematic try :} 1. Ke2 1... Nf5 $1 2. Nc6 Kd6 3. Nb4 Kc5 4. Nd3+ (4. Nxb1 Kxb4) (4. Na6+ Kd4 5. Nb5+ Kc4 6. Na3+ Kb3) 4... Bxd3+ 5. Kxd3 5... Kb4 $19) (1. Nxb1 $2 1... c2 $19) (1. Nc6 1... Kd6 $1 2. Nb4 2... Kc5 $1 3. Na6+ 3... Kd4 $19) 1... c2 (1... Nf5 2. Nc5+ Kd5 3. Nxa4 $11) (1... Kd5 2. Nxb1 c2 3. Nc3+ $11) (1... Bg6 2. Nc5+ Kd5 3. Nxa4 $11) (1... Ke5 2. Nc5 c2 3. Nd3+ 3... Kd4 {as main}) 2. Nc5+ Kd5 (2... Ke5 3. Nd3+ {the same}) 3. Nd3 Kd4 (3... Nf5 4. Ke2 Kd4 5. Kd2 $11 {with the king on d2 white draws, because c2 pawn is attacked with the knight also}) 4. Ke2 $1 4... Kc3 (4... Nf5 5. Kd2 $11) (4... Ne6 5. Kd2 $11) 5. Nb5+ $1 5... Kc4 6. Nd6+ $1 (6. Na3+ $2 6... Kb3 $19) 6... Kc3 7. Nb5+ $1 ({Thematic try :} 7. Ne4+ $2 7... Kd4 8. Nd6 8... Ne6 $1 9. Kd2 9... Ng5 $1 { white has no time to attack c2 pawn :} 10. Ne1 10... Kc5 $1 11. Nb7+ 11... Kc6 $1 12. Na5+ 12... Kb5 $1 13. Nb7 13... a3 $1 {and on} 14. Nxc2 {for example} 14... a2 15. Na1 Kb4 16. Kc1 16... Ne4 $19 {etc.}) 7... Kb3 8. Nd6 $3 { Surprising switchback , moving away the knight from taking control on a3square. } (8. Nc1+ Kb4 9. Nd6 9... Ne6 $1 $19) (8. Kd2 8... Nf5 $1 9. Nc1+ 9... Kb4 $19 ) (8. Nd4+ 8... Kc4 $1 $19) 8... Nf5 $3 (8... Ne6 9. Kd2 $13) (8... a3 9. Kd2 $1 9... Ne6 10. Nc1+ $11) (8... Kc3 9. Nb5+ Kb3 (9... Kc4 10. Nd6+ Kd5 11. Nb5 $11) 10. Nd6 $1 $11 {returns again}) 9. Nxf5 9... c1=N+ $1 {Phenix} (9... c1=Q 10. Nd4+ Kc4 11. Nxc1 Kxd4 12. Kd2 {is also draw}) 10. Nxc1+ Kc2 11. Nb3 $3 ( 11. Nd3 $2 11... Kc3 $1 12. Nc5 12... a3 $19) ({Logical try :} 11. Nd4+ 11... Kxc1 12. Nb5 12... Bf5 {/g6} 13. Ke3 13... Kc2 $1 $19 (13... Kb2 14. Kd2 { is as main line position X})) 11... Kxb3 12. Nd4+ 12... Kc3 $1 (12... Kb2 13. Nb5 Bf5 14. Kd2 $11 {position X}) 13. Nb5+ 13... Kc2 { Similar to position X, but the bishop is on b1} 14. Ke3 $1 14... Ba2 15. Na3+ $1 (15. Kd4 15... Be6 $19 {/f7}) 15... Kb2 16. Kd2 $1 16... Kxa3 (16... Be6 17. Nb5 $11) 17. Kc2 $11 {zz 4 knight sacrifices - 2 for white and 2 for black, including black Phenix. 4 knight sacrifices - 2 for white and 2 for black, including black Phenix Wonderful study with numerous surprising sacrifices and counter sacrifices - including black Phenix.} 1/2-1/2

[Event "3.p. UAPA 16th (tt) JT80 J.Copie"] [Site ""] [Date "2021"] [Round ""] [White "Richard Becker & Mario Garcia"] [Black "[+0400.12d1a8"] [Result "1/2-1/2"] [SetUp "1"] [FEN "k7/5r2/8/8/2p1P3/3p4/8/3K3R w - - 0 1"] [PlyCount "16"] [EventDate "2021"] 
 {Sec. A.2.Studies up to 8 pieces -DRAW} 1. e5 $1 (1. Kd2 $2 1... Rf2+ 2. Kc3 2... Rc2+ $19) 1... Kb7 (1... c3 2. e6 Rf2 (2... Rb7 3. Kc1 $11) 3. e7 Rd2+ 4. Kc1 Rc2+ 5. Kd1 $11) 2. e6 Rg7 (2... Re7 3. Rh4 $1 $11) 3. Kd2 $1 (3. Re1 $2 3... c3 4. e7 Rg2 5. e8=Q c2+ 6. Kc1 d2+ 7. Kb2 7... c1=Q+ $1 8. Rxc1 8... d1=Q+ $19) 3... Rg2+ (3... Kc6 4. Kc3 $11) 4. Kc3 Rc2+ 5. Kd4 Kc6 ({MAIN} 5... Kc7 6. Kd5 $1 6... d2 (6... c3 7. Rh7+ $11) 7. e7 Kd7 8. e8=Q+ $1 8... Kxe8 9. Ke6 Kd8 10. Kd6 Kc8 11. Kc6 Kb8 12. Rb1+ Ka7 13. Ra1+ Kb8 14. Rb1+ Kc8 15. Rh1 Kd8 16. Kd6 Ke8 17. Ke6 Kf8 18. Kf6 Kg8 19. Rg1+ Kh7 20. Rh1+ Kg8 21. Rg1+ Kf8 22. Rh1 {positional draw}) 6. Re1 d2 7. e7 $1 7... dxe1=Q 8. e8=Q+ $1 8... Qxe8 {stalemate. Rook endgame. 2 mainlines are compined in one study in miniature . The first one shows a model stalemate in the center.} 1/2-1/2

[Event "5.p. UAPA 16th (tt) JT80 J.Copie "] [Site ""] [Date "2021.11.09"] [Round ""] [White "Pavel Arestov"] [Black "[+0106.12d8b7"] [Result "1/2-1/2"] [SetUp "1"] [FEN "3K2n1/1k6/8/8/8/2P1p3/6Rp/2n5 w - - 0 1"] [PlyCount "16"] [EventDate "2021"] 
 {Sec. A.2.Studies up to 8 pieces -DRAW} 1. Rb2+ $1 (1. Rxh2 $2 1... e2 2. Rxe2 Nxe2 3. c4 Nd4 4. c5 4... Nc6+ $19) 1... Ka6 $1 (1... Kc6 2. Rxh2 e2 3. Rxe2 Nxe2 4. c4 {/Kc8=}) 2. Rxh2 e2 3. Rxe2 $1 (3. Rh1 $2 3... Nd3 4. Kc7 4... Kb5 $1 5. Kd6 Nf6 6. c4+ 6... Kxc4 $19) 3... Nxe2 4. Kc8 $3 (4. c4 $2 4... Nd4 5. Kc7 (5. c5 Nc6+ 6. Kc7 6... Nge7 $1 $19) 5... Ne7 $1 6. c5 6... Nec6 $19) (4. Kd7 $2 4... Kb7 $1 5. c4 Nd4 6. c5 6... Nc6 $19) (4. Kc7 $2 4... Ne7 $1 5. Kd7 5... Ng6 $1 6. Kc6 Ne5+ 7. Kd5 7... Nd3 $1 8. Kc6 8... Nef4 $1 9. c4 9... Nb4+ $1 10. Kc5 Nfd3+ 11. Kd6 11... Kb7 $1 12. c5 12... Nc6 $19) 4... Kb6 (4... Ne7+ 5. Kc7 $1 5... Nf4 6. c4 $11) (4... Ka7 5. Kc7 $1 (5. Kd7 $2 5... Kb7 $1 6. c4 6... Nd4 $19) 5... Ne7 6. Kd6 $1 6... Nc8+ 7. Kc7 Ne7 (7... Nb6 8. c4 $11) 8. Kd6 $11) 5. c4 $1 (5. Kb8 $2 5... Nf6 $1 6. c4 Nd7+ 7. Ka8 7... Nc5 $1 $19) 5... Ne7+ 6. Kb8 $1 (6. Kd7 $2 6... Nc6 7. c5+ 7... Kb7 $1 $19) 6... Nc6+ 7. Ka8 $1 (7. Kc8 $2 7... Ned4 $19) 7... Ned4 (7... Kc5 8. Kb7 $11) 8. c5+ 8... Kc7 $11 { stalemate. Amazing stalemate study. Curious that only Kc8!! leads to a draw.} 1/2-1/2