www.arves.org - British Chess Problem Society 2022

Studies awarded for the British Chess Problem Society 2022.

[Event "1st Prize E1328 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Steffen S. Nielsen, (Denmark)"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "8/6B1/p4P2/p3Np1P/Kb5r/n2P4/2pP2R1/2k5 w - - 0 1"] [PlyCount "29"] [EventDate "2021"] 
 {The Problemist 2022 Study Award (Judge: Gady Costeff) 38 studies participated in the tourney. I enjoyed every one of them and I thank the composers for this experience. My thanks also to director Yochanan Afek for his tireless work in promoting our art. I tried to understand each study, research its predecessors, and select for the award those that I considred as a substantial improvement. My choices reflect my preferences rather than any "objective" evaluation. I hope my comments to the studies will clarify these preferences. If you think I made mistakes in the award, I agree with you. 1st Prize E 1328 Steffen S. Nielsen, (Denmark) Almost every single move from 2.Nc4+ to 8.d6 opens one line and closes another, or has an otherwise arrival and departure effect, creating incredible thematic and emotional intensity. A second phase starts after 8.. c1=Q! 9.Rxc1 Rh3! 10.Rc3!! Kxc3 11.f8=Q and then resolves in two perfectly matched variations with analogous bishop sacrifices. The composer has produced at least 10 studies involving mutual pin/unpin combinations. For example, (hhdbvi 452) already uses a black pawn as one of the switching pieces similar to the role of the d-pawn here, and (2044) already showed the black bishop repeatedly blocking the rook and guarding a promotion square. However, the author increased the intensity by adding a line opening and closing introduction with mutual knight scarifices, doubled the core mechanism with a second d-pawn, and then added a brilliant concluding phase. There are six clean sacrifices, only the necessary material is used, and with most moves entirely forced, there is little thinking to be done, other than to marvel at how the composer came up with this.} 1. Rg1+ Kb2 2. Nc4+ (2. Ng6 $2 {is met by} Bc5+ 3. Nxh4 Bxg1 4. f7+ Kb1 5. f8=Q c1=Q {draws.}) 2... Nxc4 3. f7+ Ne5 4. Bxe5+ Bc3+ (4... Ka2 $4 5. Ra1#) 5. d4 Bb4 {Mutual unpins.} 6. d5+ (6. Bf6 Rxh5 ) 6... Bc3+ 7. d4 Bb4 {And again.} 8. d6 c1=Q $1 (8... Rh3 {loses to} 9. d5+ Bc3 10. Bxc3+ Rxc3 11. Kxa5 Rc8 {eg} 12. d7 $18) 9. Rxc1 Rh3 $1 (9... Kxc1 { naturally allows} 10. f8=Q $18) 10. Rc3 $1 ({Not} 10. d5+ $4 Kxc1 {wins.}) 10... Kxc3 (10... Rxc3 11. d5 $18 {pins and wins.}) (10... Bxc3 11. f8=Q Bb4 { transfers to MAIN A}) 11. f8=Q {With 2 thematic lines: MAIN A:} Kb2 ({MAIN B:}  11... Kd2 12. Bf4+ Kd1 13. Bc1 $1 Kxc1 14. Qc8+ Kb2 15. Qxa6 $18 {wins.}) 12. d5+ Ka2 13. Bb2 $1 Kxb2 14. Qg7+ Ka2 (14... Kb1 15. Qg1+ {etc}) 15. Qg2+ { The breathtaking thriller is finally over!} 1-0

[Event "2nd Prize E1346 British Chess Problem Society 2022"] [Site ""] [Date "2022"] [Round ""] [White "Serhiy Didukh , (Ukraine)"] [Black "(version)"] [Result "1-0"] [SetUp "1"] [FEN "7r/3P4/Qp1B2pn/1p1k1p2/6pP/p6R/2q2P2/5K2 w - - 0 1"] [PlyCount "43"] [EventDate "2022"] 
 {The thematic choice 1.Qb7+ (1.Qxb5+?) is comprehensible only after 17.Qb4!! With 5.Qd6+ 6.Qe5+ 7.Qe7+ the queen and rook chase the black king to h6. To stop mate, the black queen manuevers to h5, only to be incarcerated by 14.f3! The black defenses seem solid until the subtle 15.Qf6! 16.Qe7 17.Qb4! always defending h4 and eventually threatning 18.Qf4+ provides the decisive breakthrough. Since 17.Qb4! is necessary, the logic of avoiding 1.Qxb5+ ... 16. .Rb8! becomes apparent. The play, covering the entire board, is rich and far from obvious. It requires detective work to figure out why the solution works and the alternatives fail.} 1. Qb7+ $1 ({Logical try} 1. Qxb5+ $2 Kxd6 2. Qxb6+ (2. Rd3+ Kc7 3. Qe5+ Kb7 4. Qd5+ Qc6 $11) 2... Kxd7 3. Qd4+ Ke7 4. Re3+ Kf8 $1 5. Qd6+ Kg7 6. Qe5+ Kh7 7. Qe7+ Nf7 8. Qxf7+ Kh6 9. Re6 Qd1+ 10. Kg2 Qf3+ 11. Kg1 Qd1+ 12. Kh2 g3+ 13. Kg2 $1 Qh5 14. f3 Ra8 $1 15. Qf6 {The black queen is out of play, the coming invasion on the 7th rank seems decisive.} Rg8 $1 16. Qe7 Rb8 $1 {(stops Qb4 and Ra6-a7)} 17. Qf6 Rg8 18. Re7 a2 19. Ra7 a1=Q 20. Rxa1 f4 $1 21. Qxf4+ Kh7 22. Ra7+ Rg7 $11) 1... Kxd6 2. Qxb6+ Kxd7 3. Qd4+ Ke7 (3... Kc7 4. Rc3+) 4. Re3+ Kf8 $1 5. Qd6+ Kg7 6. Qe5+ Kh7 (6... Kf8 7. Qe8+ Kg7 8. Re7+ Kf6 9. Re6+) 7. Qe7+ Nf7 8. Qxf7+ Kh6 9. Re6 Qd1+ 10. Kg2 Qf3+ 11. Kg1 Qd1+ 12. Kh2 g3+ 13. Kg2 $1 (13. fxg3 $2 Qg4 14. Re7 Qd4 $11) 13... Qh5 14. f3 $1 Ra8 ({An attempt to free the queen} 14... a2 15. Ra6 a1=Q 16. Rxa1 Qxh4 { fails to} 17. Rh1 $1 {pin.}) 15. Qf6 Rg8 $1 (15... a2 16. Ra6 Rxa6 17. Qh8#) ( 15... b4 16. Re7 Rg8 17. Ra7 a2 18. Qe7) 16. Qe7 $1 {White must improve his queen's position before playing the rook on the 7th rank. Pb5 ruined Black's defence Rb8.} Rc8 (16... a2 17. Ra6 Rg7 18. Qd8 f4 19. Qh8+ Rh7 20. Qf8+ Rg7 21. Ra7 a1=Q 22. Qh8+) (16... f4 17. Re5) 17. Qb4 $1 (17. Qd6 Qxh4 $1) 17... Rg8 18. Re7 a2 (18... g5 19. Qd6+ Qg6 20. Re6) (18... Rg7 19. Re8 a2 20. Rh8+ Rh7 21. Qf8#) 19. Qf4+ $1 {That's the move the queen couldn't make from f6.} g5 20. Qxf5 Rg7 21. Re6+ Rg6 22. Qf8+ {and mate in two. Deep foresight of an elegant incarceration of the black queen and slow transfer of the white queen to break the fortress.} 1-0

[Event "3rd Prize E1357 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Michael Pasman, (Israel)"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "6N1/p7/1pk5/3p4/8/2P1Np2/2p5/4K3 w - - 0 1"] [PlyCount "23"] [EventDate "2022"] 
 {White wins the zugzwang battle with the capture avoidance moves 5.Kc1! 6.Nd2! and 7.Kb2! The logical try 6.Kxc2 a6!! is extremely valuable because it uses the a-pawn's tempo-losing capability. The logical try 2.Nf6? refuted by 5.. a6!! is rich and interesting, but less convincing, since the main line 2.Ne7+ (check!) is obviously stronger than the try.} 1. Kd2 $1 (1. Nxc2 $2 Kc5 { leads to just a draw.}) 1... f2 ({After} 1... Kc5 2. Nf6 $1 f2 (2... d4 3. Ne4+ ) 3. Nfxd5 f1=Q 4. Nxf1 Kxd5 5. Kc1 b5 6. Nd2 a6 7. Kb2 c1=Q+ 8. Kxc1 a5 9. Kc2 {White wins.}) 2. Ne7+ $1 ({Logical try :} 2. Nf6 $2 b5 $1 3. Nfxd5 f1=N+ $1 ( 3... f1=Q 4. Nb4+ $1) 4. Nxf1 Kxd5 5. Kxc2 (5. Kc1 $11) 5... a6 $3 6. Nd2 a5 $1 7. Kd3 a4 8. Kc2 {Position X3 - as X1, however with BTM.} Kc5 { Position X2 - with BK on c5 instead of d5 (see X1).} 9. Kb2 b4 10. c4 Kd4 { Draw.}) 2... Kc5 3. N7xd5 f1=Q ({or} 3... f1=N+) 4. Nxf1 Kxd5 5. Kc1 $3 ({ Logical try :} 5. Kxc2 $2 b5 6. Nd2 a5 7. Kd3 a4 $1 8. Kc2 { Position X3 - as X1 with BTM.} Kc5 {Position X2} 9. Kb2 b4 10. c4 Kd4 11. Kc2 a3 12. Kb3 Kc5 $1 13. Ne4+ Kd4 $1 14. c5 Kd5 15. Kxb4 Kxe4 16. Kxa3 Kd5 17. Kb4 Kc6 {Draw.}) (5. Ne3+ $2 Kc5 6. Nxc2 Kc4 7. Ne3+ Kb3 8. Kd3 a5 9. Nc4 a4 { Draws.}) 5... b5 6. Nd2 $1 ({Logical try :} 6. Kxc2 $2 a6 $1 7. Nd2 a5 $1 8. Kd3 a4 9. Kc2 {Position X3 - as X1, however with BTM.}) 6... a6 $1 (6... a5 7. Kxc2 a4 {Position X1} (7... Kc5 8. Nb3+ Kb6 9. Kd3 {Wins.}) 8. Kb2 $1 { see main line}) 7. Kb2 $3 ({Logical try :} 7. Kxc2 $2 a5 8. Kd3 a4 9. Kc2 Kc5 { Position X2} 10. Kb2 b4 11. c4 Kd4 {etc.}) 7... c1=Q+ (7... a5 8. Kxc2 $1 { zz position X4} a4 {Position X1} (8... Kc5 9. Nb3+ {Wins.}) 9. Kb2 $1 { see main line} Kc5 10. Ka3 {zz} Kd5 11. Kb4) (7... b4 8. c4+ Kd4 9. Kxc2 a5 10. Kb3) 8. Kxc1 a5 9. Kc2 $1 {zz X4} a4 { Position X1 with black king on d5 instead of c5} ({After either} 9... Kc5 10. Nb3+) ({Or} 9... b4 10. c4+ Kd4 11. Kb3 {White wins.}) 10. Kb2 $1 Kc5 11. Ka3 { zz} Kd5 12. Kb4 {Winning.} 1-0

[Event "3rd Prize Schakend Nederland (corr.) "] [Site "British Chess Problem Society 2022"] [Date "1979"] [Round ""] [White "Jan Rusinek & Piotr , Ruszczynski"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "1N6/3b4/6rN/1p6/3kP3/3p4/4P3/1R1K4 w - - 0 1"] [PlyCount "15"] [EventDate "2022"] 
 {This is a correction of a 1979 prizewinner (41981) so it retains its original prize but is worth commenting on. When this study first appeared in 1979, it was only the fourth study to show a Grimshaw. The Grimshaw can be defined as a Novotny without the sacrifice, and is therefore much harder to show, sixteen times harder based on the statistics. By replacing a bishop with a pawn and some further refinements, the authors corrected the study and added a crisp mutual zugzwang. Although they are completely independent studies, the critical position following 7.Rg5! is similar to the position after 8.Rf5 in Bazlov & Kovalenko, 2.p Polish Chess Federation ty (34912). A case of accidental twins.} 1. Kd2 $1 Be8 2. Nf5+ Kxe4 3. Ne7 $1 Rb6 (3... Rg2 { is met by} 4. Rb4+ Ke5 5. Kxd3 Kd6 6. Re4 Bh5 7. e3 Rg5 8. Na6 Bg4 9. Nb4 { Wins.}) 4. exd3+ Kd4 {The White Knight is trapped however...} 5. Rf1 $1 (5. Rg1 $2 Rxb8 6. Rg5 Rd8 {mzz} 7. Rf5 Rd6 $1 $11) 5... Rxb8 6. Rf5 $1 {A speedy trans fer of the Rook to create a mate net on the other side of the board!} Rd8 7. Rg5 $1 {Zugzwang.} Rd7 ({Or} 7... Bd7 8. Rd5#) ({While} 7... b4 8. Ra5 $1 { With a new decisive mate threat by the Knight.}) (7... --) 8. Nc6# { Grimshaw Interferences!} 1-0

[Event "HM E1358 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Jan Timman , (Netherlands)"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/1n1p2pk/1p6/1p2rpBK/1P6/q7/1bR5/3R3Q w - - 0 1"] [PlyCount "18"] [EventDate "2022"] 
 {Within a stalemate battle, Black sacrifices queen and rook and White responds by sacrificing his four officers. All the sacrifices close or open different lines. This is far more difficult to compose than reusing the same line as in the typical (37107), and it also avoids the monotony that repeated use of the same line may produce. An idea with scope for development.} 1. Bf4 $1 (1. Rxd7 $2 {is met by} Re1 2. Qg2 Rg1 $1 $19 {and Black wins.}) 1... Re1 $1 { A rook sac to open the long diagonal for the bishop.} 2. Rxe1 Qg3 $1 ({ A queen sac to close the half-open g-file} 2... Bf6 $2 3. Rg1 $18) 3. Bxg3 Bf6 4. Re7 $1 {A counter rook sac to open the 6th rank} Bxe7 5. Qc6 $1 ({Not} 5. Rc6 $2 {because of} d6 $1 {wins.}) 5... dxc6 ({Not} 5... d6 $2 {owing to} 6. Qe8 {winning.}) 6. Rxc6 Nd8 7. Rg6 $1 (7. Rxb6 $2 {fails to} Bf6 {wins.}) 7... Nf7 (7... Bf6 8. Bd6 ({or} 8. Bf4 Nf7 9. Rg3 Nh8 10. Bg5 $11) 8... Nf7 9. Be7 $1 $11) 8. Be5 $1 {Play for stalemate} (8. Bc7 Nh8 $1 $19) 8... Nxe5 9. Rxg7+ $1 (9. Rh6+ $2 {is refuted by} Kg8 10. Rh8+ Kf7 {game over.}) 9... Kxg7 { Stalemate} 1/2-1/2

[Event "HM E1353 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Arpad Rusz , (Romania)"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "3k4/4q3/8/3K4/8/1P6/8/3Q4 w - - 0 1"] [PlyCount "29"] [EventDate "2022"] 
 {White plays a 5-move triangulation to pass the move to black. A new discovery with long moves and the ultimate economy. Van Vliet 1888 (90724) is the classic artistic study with queen and knight pawn versus queen, and this is a pretty addition to the genre.} 1. Kc6+ {Operating the first battery.} Kc8 2. Qg4+ Kb8 3. Qg8+ Ka7 4. Qg1+ Kb8 5. Qh2+ Ka8 (5... Ka7 { allowas exchanges to a won pawn ending following:} 6. Qc7+ Qxc7+ 7. Kxc7 Ka6 8. Kc6 Ka5 9. Kc5 Ka6 10. b4 Kb7 11. Kb5 $1 Ka7 12. Kc6 Ka6 13. b5+ Ka7 14. Kc7 Ka8 15. Kb6 $1 Kb8 16. Ka6 Ka8 17. b6 Kb8 18. b7 {Queening soon.}) 6. Qh8+ Ka7 7. Qd4+ Ka8 (7... Kb8 {loses to the exchanges after} 8. Qd6+ {winning.}) 8. Qd5 $1 {By building a new battery, White threatens by 9. Kb6+ followed by 10. Qg8+. There is an asymmetry in the position caused by the presence of the pawn which allowes Black an ingenious defence:} Qb4 $1 {We have reached a 'cyclic zugzwang' position! White wins only if it reaches the same position but with BTM! This is done by a 5-move-long manoeuvre.} 9. Qg8+ ({Thematic try:} 9. Kc7+ $2 Ka7 {and 10.Qa2+ is not possible because of the harmful pawn.}) 9... Ka7 10. Qg1+ ({minor dual} 10. Qg7+) 10... Ka8 (10... Kb8 {is met by} 11. Qb6+ {wins.}) 11. Qa1+ Kb8 12. Qe5+ Ka8 (12... Ka7 13. Qc5+ {wins.}) 13. Qd5 $1 { Done! Black is in zugzwang.} Qe7 14. Kb6+ Kb8 15. Qg8+ 1-0

[Event "Commendation E1323 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Ludek Sedlak, (Czech Republic)"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/4K3/8/1P2k2P/4r3/8/8/8 w - - 0 1"] [PlyCount "17"] [EventDate "2021"] 
 {Three knight promotions, two in the main line, importantly with different king placement so no duplication, and one in a try, demonstrating the chessboard's assymetry. This is done with economy and skill. On the other hand, such knight promotions are nothing new and Becker (65001) even shows a knight promotion of different pawns in three variations.} 1. Kd7 $1 {With 2 lines: A} (1. Kf7 $2 Kf5 2. h6 Rd4 3. h7 Rd7+ 4. Kg8 Kg6 5. h8=N+ Kf6 6. b6 Rb7 $19) 1... Rd4+ ({B} 1... Kd5 2. b6 Rf4 3. b7 Rf7+ 4. Kc8 Kc6 5. b8=N+ $1 {draw.}) 2. Kc7 $1 (2. Kc6 $2 {loses to} Rd6+ $1 3. Kc7 (3. Kc5 Rd1 4. b6 Rc1+ 5. Kb5 Kd6 6. h6 Rb1+ 7. Ka6 Kc6 $19) 3... Kd5 4. b6 Rc6+ 5. Kb7 Kc5 $19) 2... Rc4+ 3. Kd7 {A1} Rb4 ({A2} 3... Rd4+ 4. Kc7 Ke6 5. b6 Rc4+ 6. Kd8 $1 Kd6 7. b7 Rb4 8. Kc8 Rc4+ 9. Kd8 {draws.}) 4. Kc6 Ke6 5. b6 Rc4+ 6. Kb5 Rc1 7. b7 Kd7 8. b8=N+ $1 Kc7 9. Na6+ {draw.} 1/2-1/2

[Event "Commendation E1351 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Daniele Gatti, ( Italy)"] [Black ""] [Result "1-0"] [SetUp "1"] [FEN "8/2pp4/p2p4/p2Pk1KN/3pP3/P4P2/p7/8 w - - 0 1"] [PlyCount "43"] [EventDate "2022"] 
 {A 22 move battle, during which the white knight travels accross the board, twice occupying c1 to control the black a-pawns. At the same time the black knight switches diagonal corners, which has been done 7 times, but here the thematic knight is also promoted for the first time.} 1. Nf4 $1 d3 2. Nxd3+ Kd4 3. Nc1 a1=N $1 (3... a1=Q {loses to} 4. Nb3+ Ke3 5. Nxa1 Kxf3 6. Kf5 {winning}) ({while} 3... Ke3 {is met by} 4. Nxa2 Kxf3 5. Nc3 Ke3 6. Kf6 Kd4 7. Ke7 Kxc3 8. Kxd7 Kd4 9. Kxc7 {game over.}) 4. f4 Nc2 5. f5 Ne1 6. f6 Nf3+ 7. Kf4 Ne5 8. Ne2+ $1 Kd3 9. Ng1 $1 Nf7 (9... c5 10. Nf3 Nf7 11. e5 Nd8 12. Kf5 dxe5 13. Nxe5+ Ke3 14. Nc6 Nf7 15. Kg6 Nd6 16. Nxa5 Kd4 17. Nb7 Nc4 18. Kf5 Ne3+ ({Or}  18... Ne5 19. Nxc5 $1 Kxd5 20. Nxa6 {wins.}) 19. Kg5 Nxd5 20. f7 {wins.}) 10. Nf3 Nh8 11. a4 $1 c5 12. dxc6 dxc6 13. e5 dxe5+ 14. Nxe5+ Kd4 15. Nxc6+ Kc5 16. Ne5 Kb4 17. Kg5 Kxa4 18. Kh6 Kb3 19. Kg7 a4 20. Kxh8 a3 21. Nd3 a2 22. Nc1+ { The lengthy battle is finally decided!} 1-0

[Event "Commendation E1354 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Ludek Sedlak, (Czech Republic)"] [Black ""] [Result "1/2-1/2"] [SetUp "1"] [FEN "8/8/k7/8/7R/8/1p4p1/2B1K3 w - - 0 1"] [PlyCount "13"] [EventDate "2022"] 
 {The composer adds a fourth rook sacrifice compared with Matous (17208), with ideal economy. How should White face the double promotion threat in E1354? How many sacrificial deflections are required before reaching the goal?} 1. Rh6+ Kb5 ({The second main line runs:} 1... Kb7 2. Rh7+ Kc6 3. Rh6+ Kd5 4. Rh5+ Ke4 5. Re5+ $1 {One!} (5. Rh4+ $2 Kf3 6. Rh3+ (6. Rf4+ $2 Kg3 {loses.}) 6... Kg4 $19) 5... Kxe5 6. Bxb2+ Ke4 7. Kf2 $11) 2. Rh5+ Kc4 3. Rh4+ Kd3 (3... Kb3 4. Rh3+ Kc2 ({Or} 4... Ka2 5. Ra3+ $1 {Two!} Kxa3 (5... Kb1 6. Be3 $11) 6. Bxb2+ Kxb2 7. Kf2 $11) 5. Rc3+ $1 {Three!} Kxc3 6. Bxb2+ Kxb2 7. Kf2 {draws}) 4. Rd4+ $1 {Four!} Kxd4 5. Bxb2+ Ke3 6. Bd4+ $1 {Five!} Kxd4 7. Kf2 {Draw. Four neat Rook sacrifices and a Bishop sacrifice for dessert. All in a super miniature!} 1/2-1/2

[Event "Commendation E1344 British Chess Problem Society 2022"] [Site ""] [Date ""] [Round ""] [White "Michael Pasman, (Israel)"] [Black ""] [Result "1-0"] [Annotator ",Afek"] [EventDate "2021"] [FEN "8/3qP3/p1np4/p2Q4/4B3/k6r/P1P5/K7 w - - 0 1"] [SetUp "1"] 
 { 19 moves of various tactics including mating threats, promotion threats, sacrifices, and skewers. The composer chose the longest conclusion, but it is also possible to provide thematic unity by using the unmentioned conclusion 14..Qf3 15.a8Q Qxa8 16.Qb3 mate, showing a Pa2 excelsior, enhanced by no double jumping, and overcoming three black units initially standing in its way. There are only three studies with these constraints. } 1.c3 $1 ( 1.Qd2 $2 { Loses to } 1...Qxe7 2.c3 Qb7 $11 3.Bxc6 $4 Rh1+ { Mating } ) 1...Rxc3 2.Qd2 $1 Kb4 3.a3+ $1 Kb5 (  { All alternatives are defeated in no time: } 3...Kb3 4.Bd5+ ) ( 3...Kc4 4.Qd5# ) ( 3...Kc5 4.Qxc3+ ) 4.Qxc3 d5 $1 { Against Bxc6+ } ( { While } 4...Nxe7 { is met by the subtle } 5.Qd4 $1 d5 6.Bc2 $1 Kc6 7.Ba4+ { Wins. } ) 5.Bd3+ Kb6 { [#] } 6.Bb5 $3 Kxb5 ( { Since } 6...axb5 { allows } 7.Qe3+ d4 8.e8=Q { Game over. } ) 7.Qd3+ $1 Ka4 8.Ka2 $1 Nb4+ $1 9.axb4 Qxe7 10.b5 $1 { A second quiet sacrifice on the same square. } 10...Qb4 11.bxa6 Qb6 12.Qb1 $1 Qe3 13.Qb2 $1 { Threatening 14.a7! } 13...d4 14.a7 Qe6+ ( 14...Qf3 15.a8=Q Qxa8 16.Qb3# ) 15.Kb1 $1 ( 15.Ka1 $2 { is sufficiently met by } 15...Qc6 ) 15...Qe1+ 16.Qc1 Qb4+ 17.Ka1 $1 Qb7 18.Qc4+ Ka3 19.Qa2+ 1-0