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Studies awarded for the
Magyar Sakkvilag 2021
magazine tournament.
[Event "1.p MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Sprenger, Jan"] [Black "2021/12-717"] [Result "1-0"] [SetUp "1"] [FEN "8/q2P4/6Kp/2bR4/4r2k/2p4p/7P/1R6 w - - 0 1"] [PlyCount "11"] [EventDate "2021"] {Prize -stunning play, taking advantage of enemy pieces which are overloaded with too many missions. The study leaves a strong impression, while remaining clear and easy to understand.} 1. d8=Q+ Qe7 $1 {The two thematic white tries now fail due to two different obstacles. 2. Rh5+? fails to 4... Re2! and 2. Re5? fails to 2...Rg4+ followed by 3... Be3+!.} (1... Be7 2. Rh5+ Kg4 3. Qd1+ Kf4 4. Rf5+ Ke3 5. Rf3#) 2. Rb4 $3 {Regardless of how Black takes on b4, he must give up one of the two obstacles. White then chooses his plan accordingly. Note that the correction try 2. Re1? prevents 2...Rg4+, but allows 2...Rxe1 and 4... Qe4+!.} ({logical try} 2. Re5 $2 Rg4+ $1 (2... Rxe5 $2 3. Rb4+ $1 Bxb4 4. Qd4+ Re4 5. Qf2+ Kg4 6. Qg3#) 3. Kxh6 Be3+ $1 4. Rxe3 Qxd8 $19) ({logical try} 2. Rh5+ $2 Kg4 3. Qd1+ Re2 $1 4. Qa4+ Re4 5. Qd1+ Re2 6. Rb4+ $2 Bxb4 $1 $19) ({correction try} 2. Re1 $2 Rxe1 $1 (2... Rg4+ 3. Kxh6 Qxd8 4. Rh5#) 3. Rd4+ Bxd4 4. Qxd4+ Qe4+ $1 $19) 2... Bxb4 ({main} 2... Rxb4 {Now there is no Re4-e2 any more and the attack with Rh5+ and Qd1+ succeeds:} 3. Rh5+ (3. Re5 $4 Qxd8 4. Re4+ Rxe4 $1) 3... Kg4 4. Qd1+ {no Re4-e2} Kf4 5. Rf5+ Ke3 6. Rf3+ Ke4 7. Qd3+ Ke5 8. Rf5+ Ke6 9. Qd5#) 3. Re5 $3 (3. Rh5+ $4 Kg4 4. Qd1+ Re2 $19) 3... Rg4+ (3... Qxd8 4. Rxe4#) (3... Rxe5 4. Qd4+ Re4 5. Qf2+ Kg4 6. Qg3# { /Qf5+ and Qh5#}) 4. Kxh6 {no bishop check on the c1-h6 diagonal} Rg6+ (4... Qxd8 5. Rh5#) 5. Kxg6 Qxd8 6. Re4# {model mate} 1-0
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[Event "1.hm MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Tarasiuk, Vladislav"] [Black "2021/9-CCXXI"] [Result "1-0"] [SetUp "1"] [FEN "k6N/pp2n2p/3P4/PP5p/3p4/2p4P/1n1p1P2/7K w - - 0 1"] [PlyCount "19"] [EventDate "2021"] {1st HM - after delayed promotion, a fine and precise maneuver of the white king decides the issue. [#]} 1. d7 d1=Q+ 2. Kg2 $1 (2. Kh2 $2 Nc6 3. bxc6 bxc6 4. a6 Qb3 5. d8=Q+ Qb8+ 6. Qxb8+ Kxb8 $19) 2... Nc6 3. bxc6 bxc6 4. a6 $3 (4. d8=Q+ $2 Kb7 5. Qd7+ Ka6 6. Qxc6+ Kxa5 7. Qc5+ Ka4 $19) 4... Qb3 5. d8=Q+ Qb8 6. Qd7 Qg8+ 7. Kh2 $1 (7. Kf1 $2 Qc4+ 8. Kg1 Qxa6 9. Nf7 Nc4 $1 $19) (7. Ng6 $2 Qd5+ $1 8. Qxd5 cxd5 $19) 7... Qb3 $1 8. Kg1 $3 (8. Nf7 $2 Nc4 $1 9. Qxc6+ Kb8 10. Qd5 Qb6 11. Qxc4 Qc7+ $1 12. Qxc7+ Kxc7 $11) (8. Ng6 $5 Qb5 $1 9. Nf4 Qxa6 10. Ne6 Qb7 11. Nc7+ Kb8 12. Qd8+ Qc8 13. Na6+ Kb7 14. Nc5+ Kb8 15. Nd7+ Kb7 $11) 8... Qg8+ 9. Ng6 $1 (9. Kh1 $2 Qd5+ $1 $19) 9... Qxg6+ 10. Kh2 $1 {wins.} 1-0
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[Event "2.hm MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Gurgenidze David - Minski, Martin"] [Black "2021/7-CCXIX-1"] [Result "1/2-1/2"] [SetUp "1"] [FEN "4k3/8/3Pr3/8/1b6/2R3K1/6Pp/6B1 w - - 0 1"] [PlyCount "32"] [EventDate "2021"] {2nd HM - the end positions are known, but two variations are combined efficiently, when the moves Kf3 and Kh3 are correct in one line and wrong in the other. Nh1 comes into play by underpromotion.} 1. Rc8+ (1. d7+ $2 Kxd7 2. Rd3+ Rd6 $19) 1... Kd7 2. Rc7+ {main A:} Kxd6 ({main B:} 2... Kd8 3. Rc1 (3. Bxh2 $2 Bxd6+ $19) 3... Be1+ $1 (3... h1=Q 4. Bb6+ Kd7 5. Rxh1 $11) (3... hxg1=Q 4. Rxg1 $11) 4. Rxe1 (4. Kxh2 $2 Rh6# {model mate}) 4... h1=N+ $1 5. Kh3 $1 (5. Kf3 $2 Rxe1 $19) (5. Kh2 $2 Rh6# {model mate}) 5... Rxe1 6. Kh2 $1 Ng3 7. Bb6+ Kd7 8. Kxg3 $11) 3. Rc1 Be1+ $1 (3... h1=Q 4. Bc5+ Bxc5 5. Rxh1 $11) ( 3... hxg1=Q 4. Rxg1 $11) 4. Rxe1 (4. Kxh2 $2 Rh6# {model mate}) 4... h1=N+ $1 5. Kf3 $1 (5. Kh3 $2 Rxe1 $19) (5. Kh2 $2 Rh6# {model mate}) 5... Rxe1 6. Bh2+ $1 Ke6 7. g4 Kf6 8. Kg2 Rd1 9. Bf4 Kg6 10. Be3 $1 Rb1 11. Bf4 Rd1 12. Be3 Rb1 13. Bf4 Re1 14. Bh2 Kg5 15. Bg1 Kxg4 (15... Ng3 16. Bf2 $11) 16. Kxh1 Kg3 { stalemate} 1/2-1/2
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[Event "3.hm MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Nielsen, Steffen"] [Black "2021/4-CCXVI"] [Result "1-0"] [SetUp "1"] [FEN "8/8/2K4P/6p1/4r3/6kP/b2B4/1R6 w - - 0 1"] [PlyCount "29"] [EventDate "2020"] {3rd HM - light setting, powerful point 4.h4!!; the final moves are of course trivial. [#]} 1. Re1 Bb1 (1... Rc4+ 2. Kb6 Rc8 (2... Rh4 3. Bxg5 Rxh3 4. Re3+) 3. Bxg5 Kxh3 4. h7 Rh8 5. Bf6 Rxh7 6. Rh1+) (1... Rxe1 2. Bxe1+ $18) (1... Rh4 2. Bxg5 $18) 2. Rxb1 (2. Rxe4 $2 Bxe4+ $11) 2... Re6+ 3. Kd5 Rxh6 4. h4 $3 Rxh4 (4... gxh4 5. Bxh6) (4... Kxh4 5. Rh1+) 5. Be1+ Kf3 6. Rb3+ $1 (6. Bxh4 $2 gxh4 7. Ke5 h3 8. Kf5 h2) 6... Kg2 7. Rb2+ $1 (7. Bxh4 $2 gxh4 8. Ke4 h3 9. Kf4 (9. Rb2+ Kg3 10. Ke3 h2 11. Rb1 Kg2 $11) 9... h2 10. Rb2+ Kh3) 7... Kf3 8. Bxh4 gxh4 9. Ke5 h3 10. Kf5 Kg3 11. Rb3+ Kg2 12. Kg4 h2 13. Rb2+ Kg1 14. Kg3 h1=Q ( 14... h1=N+ {eg} 15. Kf3) 15. Rb1# 1-0
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[Event "4.hm MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Kuzmichev, Vladimir"] [Black "2021/12-721"] [Result "1/2-1/2"] [SetUp "1"] [FEN "K7/7p/1b6/8/1k6/8/7N/8 w - - 0 1"] [PlyCount "17"] [EventDate "2021"] {4th HM - in order to stop the h-pawn, the white knight, surprisingly, has to spring from behind. In two connected variations, white succeeds to stop the h-pawn, by an unconventional means.} 1. Kb7 $1 (1. Nf3 $2 Be3 $1 (1... Bf2 $2 2. Kb7 Kc5 3. Ng5 h5 4. Ne4+ Kd4 5. Nxf2 Ke3 6. Nh3 $11) 2. Kb7 Kc5 3. Ne5 Kd4 4. Nd7 h5 5. Nf6 h4 $19) 1... Kc5 2. Nf3 $1 Ba5 ({second line} 2... Bd8 3. Kc8 Bf6 4. Kd7 Kd5 5. Ne1 h5 6. Ng2 Bg5 7. Ke8 {the king paves its way behind the enemy's lines} Ke4 8. Kf7 Kf3 9. Kg6 $11) 3. Ne5 Kd5 4. Nd7 Bc3 5. Nf8 {and here the knight approaches from behind} h5 6. Ng6 Ke4 7. Kc6 Kf5 8. Kd5 {In both lines the white knight is the bait for the black king, ebabling the white king the time to achieve a draw.} Kg4 (8... Kxg6 9. Ke4 $11) 9. Ke4 $11 1/2-1/2
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[Event "sp.hm MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "S.Didukh"] [Black "2021/12-710"] [Result "1-0"] [SetUp "1"] [FEN "n2b4/3PR3/p1r2Bp1/1p4P1/kp6/8/KP6/8 w - - 0 1"] [PlyCount "25"] [EventDate "2018"] {Sp. HM As the composer notes, Liburkin ((Kg5/Ka5, 1935, unsound) made the original matrix with knight and rook promotions. The present study adds value: the undefended rook moves 2.Re6! and 5.Rc6! are noteworthy and the theme of stalemate black defences is doubled, on different squares.} 1. b3+ (1. Re4 $2 Bc7 $1 (1... Nb6 $2 2. Bxd8 Nxd7 3. b3#) (1... Rxf6 2. gxf6 Bxf6 3. Re6) 2. Be5 (2. Be7 Ka5) 2... Bd8 $1 (2... Bb6 $2 3. Bc3) 3. Bf6 Bc7 $11) 1... Ka5 2. Re6 $1 Rc2+ ({main} 2... Rxe6 3. Bxd8+ Rb6 (3... Nb6 4. Bxb6+ Rxb6 5. d8=N $1 (5. d8=Q $2 {stalemate with Rb6.})) 4. Bxb6+ Nxb6 5. d8=R $1 (5. d8=Q $2 { stalemate with Nb6.})) 3. Kb1 Rc7 ({main} 3... Nc7 4. Rd6 $1 (4. Bxd8 $2 Rc1+ 5. Kxc1 {stalemate with Nc7.}) (4. Re8 $2 Rd2) 4... Rc5 5. Kb2 $1 {White can wait with Kb1-b2, Black can't.} (5. Bd4 $2 Ne6 6. Rxe6 Rd5 $11) 5... Ne6 6. Rxe6 Rc7 7. Rd6 $1 (7. Bxd8 $2 {stalemate with Rc7.})) 4. Bxd8 Nb6 5. Rc6 $1 Rxc6 (5... Rxd7 6. Bxb6#) 6. Bxb6+ Rxb6 7. d8=N $1 Rb8 (7... Rd6 8. Nb7+) 8. Nc6+ Kb6 9. Nxb8 a5 10. Nd7+ Kc6 11. Ne5+ ({or} 11. Nf8) 11... Kd6 12. Nxg6 Ke6 13. Nh4 $1 {(minor promotions from Liburkin=M, Trud 1935)} 1-0
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[Event "1.c MSV-2021"] [Site "ACER-PC"] [Date "2021"] [Round ""] [White "Krug, Peter"] [Black "2021/12-712"] [Result "1-0"] [SetUp "1"] [FEN "1N1N1K2/2n1P3/8/6bP/8/3k4/8/4n3 w - - 0 1"] [PlyCount "27"] [EventDate "2021"] [TimeControl "300"] {1st comm. - very simple but aesthetic and pleasant. Recurring knight sacrifices in an economical setting.} 1. Na6 {!} Bxe7+ 2. Kxe7 Nd5+ 3. Kf7 Nf3 (3... Ke4 4. h6 Nf3 5. Nc6 Nf4 6. Nc5+ Kf5 7. Ne7+ Kg4 8. Ne4) 4. Nb4+ {! try} (4. h6 {?} Ne5+ 5. Ke6 Nf6 6. Nf7 Neg4 {=}) 4... Nxb4 5. h6 Nd5 6. Kg7 Ng5 7. Kg6 Ne4 8. h7 Ne7+ 9. Kg7 (9. Kh6 {?} Nf5+ 10. Kg6 Ne7+) 9... Nf5+ 10. Kf8 Nh4 11. Ne6 {!} (11. Nf7 {?} Ng6+ 12. Kg7 Nh8 {!=}) 11... Ng6+ 12. Kg7 Nh8 13. Nc5+ {!} Nxc5 14. Kxh8 {wins.} 1-0
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[Event "2.c MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Arestov Pavel - Hlinka, MIchal"] [Black "2021/10-CCXXI-2"] [Result "1/2-1/2"] [SetUp "1"] [FEN "1B6/1b6/pP2k2p/1P6/R7/2K3n1/6p1/8 w - - 0 1"] [PlyCount "28"] [EventDate "2021"] {2nd comm. - an immediate promotion fails, so white delays it for many moves, without black being able to exploit it, even after the quiet 8.Ra3!.} 1. Ra1 Nf1 2. Bh2 $1 Nxh2 3. bxa6 Bxa6 $1 4. Rxa6 $1 (4. Rg1 $2 Bb7 $19 {[%emt 0:00: 01]}) 4... g1=Q 5. b7+ Kd5 $1 (5... Kd7 $2 6. b8=Q $11) 6. Ra5+ (6. b8=Q $2 Qc1+ $1 7. Kd3 Qf1+ 8. Kc3 Qxa6 $19) 6... Ke4 (6... Kc6 $2 7. b8=Q $11) 7. Ra4+ (7. b8=Q $2 Qc1+ $19 {/Qe1}) 7... Ke3 8. Ra3 $1 (8. b8=Q $2 Qc1+ $19) (8. Ra8 $2 Qg7+ $19) 8... Qg8 (8... Qc1+ 9. Kb4+ Kd4 10. b8=Q Qc4+ 11. Ka5 Qc5+ 12. Ka4 $1) 9. Kb4+ $1 (9. Kb2+ $2 Kd2 10. Ra8 Qg7+ $19) 9... Kd4 10. Ra8 Qc4+ 11. Ka5 Qc5+ 12. Ka6 Qc6+ 13. Ka7 Qc5+ 14. Ka6 $1 $11 (14. Kb8 $2 Nf3 $19) 14... Qb4 1/2-1/2
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[Event "3.c MSV 2021"] [Site ""] [Date "2021"] [Round ""] [White "Krug Peter - Garcia, Mario"] [Black "2021/12-713"] [Result "1-0"] [SetUp "1"] [FEN "4N1R1/P4Kpk/5pp1/8/8/8/3p2r1/2B2rq1 w - - 0 1"] [PlyCount "15"] [EventDate "2021"] {3rd comm. - resembles a problem; beautiful geometric motive at the end.} 1. a8=Q Qa7+ $1 (1... Kh6 2. Bxd2+ Rxd2 3. Rh8+ Kg5 4. Qa5+ Kg4 5. Qxd2 $18) (1... dxc1=Q 2. Rh8+ Kxh8 3. Nxf6+ Qc8 4. Qxc8#) 2. Qxa7 dxc1=Q 3. Rh8+ $3 (3. Nxg7 $2 Re1 4. Nf5 gxf5 5. Rxg2 Kh6 {=}) 3... Kxh8 4. Kf8 Qh6 (4... Qc5+ 5. Qxc5 Kh7 6. Qc8 $18) 5. Qf7 Qh7 6. Nd6 Ra1 (6... Rb2 7. Qb3 $1 $18) (6... Rc1 7. Qc4 $1 $18) (6... Rd1 7. Qd5 $1 $18) (6... g5 7. Qe6 {/d5/c4} g6 8. Nf7+ $18) 7. Qa2 Raxa2 (7... Qh4 8. Qg8#) 8. Nf7# 1-0
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[Event "4.c MSV-2021"] [Site ""] [Date "2021"] [Round ""] [White "Pasman, Michael"] [Black "2021/12-716"] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/5P2/2P2p1r/1BnpPr2/1k1K4/6B1/4P3/8 w - - 0 1"] [PlyCount "29"] [EventDate "2021"] {4th comm. A king forking two rooks has been known long ago (e.g. Amelung Ke6/ Ka2 1902, and others), but the in-between 5.e6! deserves merit.} 1. c7 $1 (1. f8=Q fxe5+ 2. Kxd5 Rxf8) 1... Rh8 2. Be8 $1 (2. Bc6 Ne6+ 3. Kxd5 Nxc7+) 2... Ne6+ 3. Kxd5 Nxc7+ 4. Kc6 $1 (4. Kd6 $2 Nxe8+) 4... Rxe8 $1 (4... Nxe8 5. e6 $1 Rc5+ (5... Rg5 6. e7) 6. Kd7 Rd5+ 7. Kc6 $1 Rc5+ 8. Kd7 $11) (4... Ne6 5. Kd6 $1 Nc5 6. e6) 5. e6 $3 (5. fxe8=Q Nxe8 $19) ({logical try :} 5. Kxc7 Re7+ 6. Kd6 Rxf7 {and e5 pawn only plays against white, and there is no Ke6 move}) 5... Rxe6+ (5... Rc5+ 6. Kd7 Rd8+ 7. Kxd8 $11) 6. Kxc7 (6. Kd7 $2 Rd5+ $1 7. Kxc7 Re7+) 6... Re7+ 7. Kd6 Rxf7 8. Ke6 $1 {double attack} Rf1 (8... Rg7 9. Be1+ Kc4 10. Kxf5 $11) 9. Kxf7 Kc5 (9... Kc3 10. e4 $1) 10. e4 $1 (10. Bh4 f5 11. Ke6 Kd4 $1 12. e3+ Ke4 $1 $19) 10... Kd4 11. Bh4 $1 Ke5 12. Ke7 Rf3 13. Kf7 $1 Rf4 14. Bg3 Kxe4 15. Bxf4 1/2-1/2
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[Event "5.c MSV-2021"] [Site ""] [Date "2022"] [Round ""] [White "Richardson, Itay"] [Black "2021/7-CCXIX-2"] [Result "1-0"] [SetUp "1"] [FEN "8/1p1p4/2Ppq3/4B1b1/2k5/2p1p2N/4pR2/R3K1N1 w Q - 0 1"] [PlyCount "15"] [EventDate "2022"] {5th comm. - the final combination, culminating in 7.Qc4+!!, is very beautiful, but the construction is heavy, with pieces 'hanging' in the initial position.} 1. Rf4+ $1 (1. Rg2 $2 dxe5 2. Nxg5 Qxc6 3. Rxe2 Qh6 4. N5f3 d6 $10) (1. c7 $4 exf2+ 2. Kxf2 Bh4+ 3. Kf3 Qd5+ 4. Kg4 Qg8+ 5. Kxh4 dxe5 $19) 1... Bxf4 2. c7 $1 (2. cxb7 $2 Qd5 $1 3. Ra4+ Kb3 4. b8=Q+ Kxa4 $10) (2. Bxf4 $4 dxc6 $19) 2... Bxe5 (2... Qg8 3. Bxf4 Qc8 4. Bxd6 $18) 3. c8=Q+ Kd3 (3... Kb4 4. Rb1+ Qb3 5. Qxb7+ $18) 4. Nf4+ $1 (4. Nxe2 $2 Qxh3 5. Rd1+ Kc2 6. Rc1+ Kd3 $10) 4... Bxf4 5. Nxe2 Bg3+ $1 (5... Qe5 6. Ra4 Bh2 7. Kd1 d5 (7... c2+ 8. Qxc2#) 8. Nc1#) 6. Nxg3 (6. Kd1 $4 Qb3+ 7. Kc1 Qc2#) (6. Kf1 $4 Qh3+ 7. Kg1 Qh2+ 8. Kf1 Qf2#) 6... Qg4 (6... Qb3 7. Qxd7 $18) 7. Qc4+ $3 (7. Rd1+ Kc2 8. Rc1+ Kxc1 9. Qxc3+ Kb1 $10) 7... Qxc4 (7... Kxc4 8. Ra4+ Kd3 9. Rxg4 c2 10. Ne2 $18) 8. O-O-O# 1-0
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[Event "6.c MSV-2021"] [Site ""] [Date "2020"] [Round ""] [White "Hlinka Michal -Kekely, Lubos"] [Black "2021/2-CCXIV."] [Result "1/2-1/2"] [SetUp "1"] [FEN "r1B1r1k1/8/8/2R1n1K1/8/R7/1p6/8 w - - 0 1"] [PlyCount "23"] [EventDate "2020"] {6th comm. - the first two move are redundant; white ignores black's advanced pawn and keeps equality by creating constant threats against the BK.} 1. Be6+ $1 (1. Rb3 $2 Nd3 2. Rc6 Rexc8 3. Rg6+ Kf8 4. Rf6+ Ke8 5. Re6+ Kd7 $19) (1. Rxa8) 1... Nf7+ (1... Kf8 2. Rxa8 (2. Rb3 $2 Rxe6 3. Rxb2 Nf7+ $19) 2... Rxa8 ( 2... b1=Q 3. Rxe8+ Kxe8 4. Rxe5 $11) 3. Rb5 $11) (1... Kg7 2. Rc7+ Kf8 3. Rh3 Re7 4. Rh8+ $11) (1... Rxe6 2. Rxa8+ $11) 2. Bxf7+ Kxf7 3. Rf5+ $1 (3. Rb3 $2 Reb8 $1 4. Rcb5 Ra5 $1 $19 {pin}) 3... Kg7 (3... Ke6 4. Re3+ Kd6 5. Rd3+ Kc6 6. Rc3+ Kd6 7. Rd3+ {switchback- perpetual check}) 4. Rg3 $1 (4. Rxa8 $2 Rxa8 5. Rb5 (5. Rf1 Ra1 $19) 5... Ra5 $19) 4... Re3 $1 (4... Ra3 5. Rg2 Re2 6. Rg4 Re4 7. Rg1 $11) (4... b1=Q 5. Kf4+ $1 Kh6 6. Rh3+ Kg7 7. Rg3+ {switchback} Kh8 8. Rh3+ $1 {switchback - perpetual check} (8. Rh5+ $2 Qh7 $19)) 5. Rg2 $1 (5. Rg1 $2 Ra1 6. Rg2 Re2 7. Rxe2 (7. Rg3 Re7 $19) 7... Rg1+ 8. Kf4 b1=Q $19) (5. Rg4 $2 Re4 6. Rg3 b1=Q $19) 5... Re2 6. Rg3 $1 {switchback} (6. Rg4 $2 Re4 7. Rg1 Rb4 8. Kh5+ Kh8 9. Rb1 (9. Rff1 Ra5+ 10. Kg6 Rb6+ $19) 9... Ra1 $19) 6... Ra3 7. Rg4 $1 (7. Rg1 $2 Ra1 8. Rg3 Re7 $19) 7... Ra4 8. Rg3 {switchback} (8. Rg1 $2 Ra1 9. Rff1 Rxf1 10. Rxf1 Rg2+ 11. Kh4 (11. Kf4 Rf2+ $19) 11... Rc2 12. Rb1 Kf6 $19) 8... b1=Q 9. Kh5+ Kh7 10. Rf7+ Kh8 11. Rf8+ Kh7 12. Rf7+ {switchback - perpetual check. Fight against dangerous black pawn in four rooks ending. Synthesis of three perpetual checks. Switchbacks.} 1/2-1/2
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