MESON Chess Problem Database
Problem Display
PID: 57149 (3K2R1/2N5/3N1k1p/3P1Pbq/3p4/3B1RQp/5P1P/8 w - - 0 1)
O'Keefe, John James
Comm., Brisbane Courier, 1917
#2
11 + 6
SOLUTION
- SOUND
- Sets
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qe8+
- 2.Scxe8#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bf4
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qxf3
- Tries
- 1.Kd7?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qf7+!
- 1...Qe8+
- 1.Scb5?
- 1...Qxf3
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qe8+!
- 1...Qxf3
- 1.Sa6?
- 1...Qxf3
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qe8+!
- 1...Qxf3
- 1.Se6?
- 1...Qxf3
- 2.Rg6#
- 2.Rf8#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Rg6#
- 2.Rf8#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Rg6#
- 2.Rf8#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qe8+!
- 1...Qxf3
- 1.Sa8?
- 1...Qxf3
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...Qe8+!
- 1...Qxf3
- 1.Bb1?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Bf1?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Bc2?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Be2?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Bc4?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Bb5?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Ba6?
- 1...Qe8+
- 2.Scxe8#
- 1...Qxf3
- 2.Sce8#
- 2.Rg6#
- 1...Bf4
- 2.Qg7#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qg6
- 2.Rxg6#
- 1...Qf7
- 2.Se4#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bc1
- 2.Qg7#
- 1...Bd2
- 2.Qg7#
- 1...Be3
- 2.Qg7#
- 1...Bh4
- 2.Qg7#
- 1...d3!
- 1...Qe8+
- 1.Re3?
- threat
- 2.Re6#
- 2.Qe5#
- 1...Qe8+
- 2.Scxe8#
- 1...Bxe3
- 2.Qg7#
- 1...Qe2
- 2.Sce8#
- 2.Rg6#
- 2.Qe5#
- 1...Qf7
- 2.Qe5#
- 1...Bf4
- 2.Re6#
- 2.Qg7#
- 1...dxe3!
- threat
- 1.Rf8+?
- 1...Qf7
- 2.Sde8#
- 2.Sce8#
- 2.Rxf7#
- 1...Kg7+!
- 1...Qf7
- 1.Qf4?
- threat
- 2.Qxd4#
- 1...Qe8+
- 2.Scxe8#
- 1...Qg4
- 2.Sce8#
- 2.Rg6#
- 1...Qh4
- 2.Sce8#
- 2.Rg6#
- 1...Bxf4!
- threat
- 1.Kd7?
- Keys
- 1.Re8!
- threat
- 2.Qe5#
- 1...Kg7+
- 2.f6#
- 1...Qxe8+
- 2.Scxe8#
- 1...Bc1
- 2.Re6#
- 1...Bd2
- 2.Re6#
- 1...Be3
- 2.Re6#
- 1...Bf4
- 2.Re6#
- 1...Bh4
- 2.Re6#
- threat
- 1.Re8!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 5
- ADDED MATES = 1
- REMOVED MATES = 2
- Sets
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Tries
- Try
- K(J);P-FLIGHT
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Refutation
- Q(d);CHECK
- Try
- S(I);
- Vars
- Q(d);N_GUARD,XR(D)::R1(K)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- Q(d);CHECK
- Try
- S(I);
- Vars
- Q(d);N_GUARD,XR(D)::R1(K)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- Q(d);CHECK
- Try
- S(I);
- Vars
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- Q(d);CHECK
- Try
- S(I);
- Vars
- Q(d);N_GUARD,XR(D)::R1(K)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- Q(d);CHECK
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- B(C);
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE::QAB1(E)
- Q(d);N_GUARD::R1(K),XQ(d)
- Q(d);SBLOCK::S(H)
- Refutation
- P(b);
- Try
- R(D);
- Threat
- DUALS(2)
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- B(c);OGATE,XR(D)::QAB1(E)
- Q(d);::QAB1(E)
- Refutation
- P(b);XR(D)
- Try
- R(K);CHECK
- Refutation
- K(e);CHECK,P_SPINB(c),S_FLIGHT
- Try
- Q(E);
- Threat
- QAB(E),XP(b)
- Vars
- Q(d);CHECK,N_GUARD::S(I),XQ(d)
- Refutation
- B(c);XQ(E)
- Try
- Actual
- R(K);
- Threat
- QAB1(E)
- Vars
- K(e);CHECK,OGATE,P_SPINB(c),S_FLIGHT::P(G)
- Q(d);CHECK,XR(K)::S(I),XQ(d)
- B(c);::R1(K)
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).