MESON Chess Problem Database
Problem Display
PID: 70721 (8/1K2Q1r1/4P1N1/b4k1r/Bp2R2B/3P2R1/3Nb3/7q w - - 0 1)
Nadezhdin, Nikolai Dmitrievich
Shakhmaty v SSSR, 1971
#2
10 + 7
SOLUTION
- SOUND
- Sets
- 1...Qxe4+
- 2.dxe4#
- 1...Qa1
- 2.Rf4#
- 1...Qb1
- 2.Rf4#
- 2.Re5#
- 1...Qc1
- 2.Rf4#
- 2.Re5#
- 1...Qd1
- 2.Rf4#
- 2.Re5#
- 1...Qe1
- 2.Rf4#
- 2.Re5#
- 1...Qf1
- 2.Re5#
- 1...Qg1
- 2.Rf4#
- 2.Re5#
- 1...Qh2
- 2.Rf4#
- 2.Re5#
- 1...Qh3
- 2.Rf4#
- 2.Re5#
- 1...Qxh4
- 2.Re5#
- 1...Rxh4
- 2.Rg5#
- 1...Rg5
- 2.Rxg5#
- 1...Rh6
- 2.Rg5#
- 1...Rhh7
- 2.Rg5#
- 1...Rh8
- 2.Rg5#
- 1...Rxg6
- 2.Qc5#
- 1...Rxe7+
- 2.Sxe7#
- 1...Rf7
- 2.Qxf7#
- 1...Rg8
- 2.Qc5#
- 2.Qf6#
- 2.Qf7#
- 1...Bc7
- 2.Qf6#
- 1...Qxe4+
- Tries
- 1.Ka6?
- threat
- 2.Rf4#
- 2.Re5#
- 2.Qc5#
- 2.Qf6#
- 1...Qxe4
- 2.Qf6#
- 1...Qxh4
- 2.Re5#
- 1...Rxh4
- 2.Rg5#
- 2.Re5#
- 2.Qg5#
- 1...Rxg6
- 2.Qc5#
- 1...Rxe7
- 2.Sxe7#
- 2.Re5#
- 1...Rg5
- 2.Rxg5#
- 2.Qxg5#
- 1...Bg4
- 2.Qf6#
- 1...Qf3
- 2.Re5#
- 2.Qc5#
- 2.Qf6#
- 1...Qa1
- 2.Rf4#
- 1...Qc1
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Qf1
- 2.Re5#
- 2.Qc5#
- 2.Qf6#
- 1...Qg1
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Rf7
- 2.Rf4#
- 2.Re5#
- 2.Qc5#
- 2.Qxf7#
- 1...Bb6
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Bc7
- 2.Qf6#
- 1...Bd8
- 2.Rf4#
- 2.Re5#
- 2.Qc5#
- 1...Bxd3+!
- threat
- 1.Kc6?
- threat
- 2.Qc5#
- 2.Qf6#
- 1...Qxe4+
- 2.dxe4#
- 1...Qxh4
- 2.Re5#
- 1...Rxh4
- 2.Rg5#
- 2.Qg5#
- 1...Rxg6
- 2.Qc5#
- 1...Rxe7
- 2.Sxe7#
- 1...Rg5
- 2.Rxg5#
- 2.Qxg5#
- 1...Bg4
- 2.Qf6#
- 1...Qa1
- 2.Rf4#
- 1...Qg1
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Rf7
- 2.Qc5#
- 2.Qxf7#
- 1...Bb6
- 2.Qf6#
- 1...Bc7
- 2.Qf6#
- 1...Bd8
- 2.Qc5#
- 1...Qc1+!
- threat
- 1.Bc6?
- threat
- 2.Rf4#
- 2.Re5#
- 1...Rxe7+
- 2.Sxe7#
- 1...Qxe4
- 2.Bxe4#
- 2.dxe4#
- 1...Qxh4
- 2.Re5#
- 1...Rxh4
- 2.Rg5#
- 2.Re5#
- 1...Rxg6
- 2.Qc5#
- 1...Rg5
- 2.Rxg5#
- 1...Qf3
- 2.Re5#
- 1...Qa1
- 2.Rf4#
- 1...Qf1
- 2.Re5#
- 1...Bc7
- 2.Qf6#
- 1...Bg4!
- threat
- 1.Qxg7?
- threat
- 2.Se7#
- 2.Qe5#
- 2.Qf6#
- 2.Qf8#
- 2.Qf7#
- 1...Qxh4
- 2.Re5#
- 2.Qe5#
- 1...Rxh4
- 2.Se7#
- 2.Qe5#
- 2.Qf8#
- 2.Qf7#
- 1...Qa1
- 2.Se7#
- 1...Rg5
- 2.Se7#
- 2.Rxg5#
- 2.Qf7#
- 1...Rh7
- 2.Se7#
- 2.Rg5#
- 1...Rh8
- 2.Se7#
- 2.Rg5#
- 2.Qe5#
- 2.Qf6#
- 2.Qf7#
- 1...Bg4
- 2.Se7#
- 2.Qf6#
- 2.Qf7#
- 1...Bc7
- 2.Se7#
- 2.Qf6#
- 2.Qf8#
- 2.Qf7#
- 1...Bd8
- 2.Qe5#
- 1...Qxe4+!
- threat
- 1.Ka6?
- Keys
- 1.Bd7!
- threat
- 2.Qc5#
- 2.Qf6#
- 1...Qxe4+
- 2.dxe4#
- 1...Qxh4
- 2.Re5#
- 1...Rxh4
- 2.Rg5#
- 2.Qg5#
- 1...Rxg6
- 2.Qc5#
- 1...Rxe7
- 2.Sxe7#
- 1...Rg5
- 2.Rxg5#
- 2.Qxg5#
- 1...Bg4
- 2.Qf6#
- 1...Qa1
- 2.Rf4#
- 1...Qc1
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Qg1
- 2.Rf4#
- 2.Re5#
- 2.Qf6#
- 1...Rf7
- 2.Qc5#
- 2.Qxf7#
- 2.exf7#
- 1...Bb6
- 2.Qf6#
- 1...Bc7
- 2.Qf6#
- 1...Bd8
- 2.Qc5#
- threat
- 1.Bd7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 7
- Sets
- Q(a);CHECK,OGATE,XR(E)::P(B),XQ(a)
- Q(a);N_PINR(E)::R1(E)
- Q(a);N_PINR(E),XB(F)::R1(E)
- R(f);N_GUARD,XB(F)::R1(C)
- R(f);N_GUARD::R1(C),XR(f)
- R(f);N_GUARD::R1(C)
- R(g);N_PINQ(J),XS(H)::QAR(J)
- R(g);CHECK,XQ(J)::S(H),XR(g)
- R(g);N_GUARD::QAR2(J),XR(g)
- B(d);N_PINQ(J)::QAR1(J)
- Tries
- Try
- K(I);N_SPINQ(J),N_SPINR(E),P_SPINP(B),S_FLIGHT
- Threat
- DUALS(4)
- Vars
- Q(a);XR(E)::QAR1(J)
- Q(a);XB(F)::R1(E)
- R(g);XS(H)::QAR(J)
- B(b);N_PINP(B)::QAR1(J)
- Q(a);::R1(E)
- B(d);::QAR1(J)
- Refutation
- B(b);CHECK,XP(B)
- Try
- K(I);N_SPINQ(J),S_FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(a);CHECK,OGATE,XR(E)::P(B),XQ(a)
- Q(a);N_PINR(E),XB(F)::R1(E)
- R(g);P_PINP(G),XS(H)::QAR(J)
- R(g);XQ(J)::S(H),XR(g)
- B(b);::QAR1(J)
- Q(a);N_PINR(E)::R1(E)
- B(d);::QAR1(J)
- B(d);::QAR(J)
- Refutation
- Q(a);CHECK,N_PINR(E)
- Try
- B(D);N_SPINR(E)
- Threat
- DUALS(2)
- Vars
- R(g);CHECK,XQ(J)::S(H),XR(g)
- Q(a);XB(F)::R1(E)
- R(g);N_PINQ(J),XS(H)::QAR(J)
- R(f);N_GUARD::R1(C),XR(f)
- Q(a);::R1(E)
- B(d);N_PINQ(J)::QAR1(J)
- Refutation
- B(b);
- Try
- Q(J);N_SPINQ(J),XR(g)
- Threat
- DUALS(5)
- Vars
- Q(a);N_PINR(E)::S(H)
- B(d);::QAR1(J)
- Refutation
- Q(a);CHECK,XR(E)
- Try
- Actual
- B(D);N_SPINQ(J)
- Threat
- DUALS(2)
- Vars
- Q(a);CHECK,OGATE,XR(E)::P(B),XQ(a)
- Q(a);N_PINR(E),XB(F)::R1(E)
- R(g);XS(H)::QAR(J)
- R(g);P_PINB(D),XQ(J)::S(H),XR(g)
- B(b);::QAR1(J)
- Q(a);N_PINR(E)::R1(E)
- B(d);::QAR1(J)
- B(d);::QAR(J)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).