1. Rd6+! Bxd6 2. Qd5+ Kf5 3. Bxd7+! 3. exd6+? Qe5+ 4. Qxe5+ Kxe5 -+ 3... Qxd7 4. e6+ Be5+ 5. Qxe5+ Kxe5
6. exf7! 6. exd7? Rxd7/Rf8+ -+ 6... Qd8+ 6... Qxf7 stalemate; 6... Kf6 7. f8=Q+ Kg6 8. Qg8+ = 7. Kg7 Qe7 8. Kg8 =
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Related studies: Study 89
1.Qf6+! Before we take the pawn, the queen must be relocated to block the g-file. 1.cxd4? g2+! fork with pawn sacrifice 2.Kxg2 Rg8+ 3.Kh1 Qg3= 1...Kg8 2.Qg6+ Kf8
Thematic try: 3.exd4? Rg8 4.dxc5! queen sacrifice 4...Rxg6? 5.fxg6+ Ke8 6.Rf8+! rook sacrifice 6...Kxf8 7.cxb6+ Kg8 8.bxc7 Rxc7
9.h7+ Kg7 10.Bf8+! bishop sacrifice 10...Kh8 11.Bd6 Rg7 12.Be5 e3 13.Bxg7+! +- bishop sacrifice (13.Kg2? h1Q+ 14.Kxh1 g2+ 15.Kh2 g1Q+ 16.Kxg1 stalemate)
Another defence also fails: 4...g2+? 5.Qxg2 bxc5 6.Qf2 e3! 7.Qxe3 Qc6+ 8.Rf3 Qd6 9.Rf4 Rc7 (9...Qd5+ 10.Re4+-) 10.Qd4!+-; b) but there is one which works: 4...b5! 5.c6+ b4= (6.cxb4? g2+! 7.Kxg2 Qf7! 8.b5+ Ke8–+)
So let's go back to the main line:
Main line: 3.cxd4! Rg8 4.dxc5! queen sacrifice It doesn't make sense to escape with the queen: 4.Qf6+? Qf7 5.Qd8+ Qe8= 4...Rxg6 4...g2+ 5.Qxg2! (5.Kxg2? Qf7! 6.cxb6+ Re7! (6...Ke8? 7.bxa7 Rxg6+ 8.fxg6 Qxf1+! queen sacrifice 9.Kxf1 h1Q+ 10.Kf2 Qh4+ 11.Kg2 Qg5+ 12.Kf1 Qf6+ 13.Ke1 Qa1+
14.Bc1!! bishop sacrifice - unguarded guard 14...Qxc1+ (14...Qc3+ 15.Kd1+-) 15.Kf2 Qc6 16.a8Q+! Qxa8 17.h7 Ke7 18.g7+-) 7.Qxg8+ Kxg8!= (7...Qxg8+? 8.Kh1! Kf7 9.Bxe7 Qg4 10.Re1!+-) ) 5...Rxg2 (5...bxc5 6.Qxe4+-) 6.cxb6+ Kf7 7.bxc7 Rg1+ 8.Kxh2! (8.Rxg1? hxg1Q+ 9.Kxg1 Rxc7 10.Bb2 Kg8=) 8...Rxf1 9.c8Q+-; 4...b5 5.Kg2! b4 6.Bb2! (6.Qf6+? Qf7 7.Qd6+ Qe7 8.h7 Qxd6 9.hxg8Q+ Kxg8 10.cxd6 bxa3=) 6...Rxg6 7.fxg6+ Kg8 8.h7++-
5.fxg6+ 5.cxb6+? Ke8 6.bxc7 g2+ fork –+ 5...Ke8 6.Rf8+! With the help of this rook sacrifice white manages to fire both batteries. 6...Kxf8 7.cxb6+ fork 7...Kg8 7...Qe7 8.bxa7 Qxa3 9.a8Q++-
8.bxa7!! Thematic try: 8.bxc7? Rxc7
position B1 (WCCT-10)
9.Bb2 Rg7! rook sacrifice 10.h7+ (10.hxg7 g2+ 11.Kxg2 h1Q+ 12.Kxh1 stalemate; 10.Bxg7 g2+ 11.Kxg2 h1Q+ 12.Kxh1 stalemate) 10...Kh8
11.Bd4 g2+ 12.Kxg2 h1Q+ 13.Kxh1 stalemate 8...Qxa7 9.Bb2 Qg7! queen sacrifice 10.h7+! 10.Bxg7? g2+ 11.Kxg2 h1Q+ 12.Kxh1 stalemate; 10.hxg7? g2+ 11.Kxg2 h1Q+ 12.Kxh1 stalemate 10...Kh8
11.Bd4! 11.Bxg7+? Kxg7 12.Kg2 Kh8 13.a3 Kg7 14.Kh1 Kh8 positional draw 11...Qxd4 12.exd4 +-
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1. d7 Qxd7!! 1... Rxd7 2. Rxd7 Qxd7 3. h6 Qc7 4. Bxh7! Qc1+ (4... Qxh7 stalemate) 5. Bb1 Qxh6 6. Be4 Qc1+ 7. Bb1 Qc2! 8. Bxc2 bxc2 9. Ka2 c1=N+ 10.Kb1 Ne2 11. Kc2 Nf4 12. Kc3 Ne6 13. Kc2 mutual zugzwang Nd8 14. Kc3 Nc6 15. Kc2 positional draw - blockade 2. h6! 2. Rxd7? Rxd7 3. h6 Rc7 4. Be4 Rc1+ 5. Bb1 Rc2! 6. Bxc2 bxc2 7. Ka2 c1=N+ -+ 2... Re7 2... Qxd1 3. hxg7 Qg1 4. g8=Q Qxg8 5. Bxh7! Qxh7 stalemate 3. Re1!! Rf7 3... Rxe1 stalemate with pinned B 4. Rf1! Re7 5. Re1 positional draw - perpetual attack/stalemate
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