MESON Chess Problem Database
Problem Display
PID: 7797 (7q/8/4p1B1/5RP1/3Bk3/6P1/2P1N3/K3Q3 w - - 0 1)
Quack, Godfrey C
The Problemist, 1993
#2
9 + 3
SOLUTION
- SOUND
- Sets
- 1...Qxd4+
- 2.Sc3#
- 1...Qe5
- 2.Qh1#
- 1...Qf6
- 2.Qh1#
- 1...Qg7
- 2.Qh1#
- 1...Qh1
- 2.Qxh1#
- 1...Qb8
- 2.Qh1#
- 1...Qc8
- 2.Qh1#
- 1...Qd8
- 2.Qh1#
- 1...Qe8
- 2.Qh1#
- 1...Qf8
- 2.Qh1#
- 1...Qg8
- 2.Qh1#
- 1...Qxd4+
- Tries
- 1.Qf2?
- threat
- 2.Sc3#
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qa8+
- 2.Ra5#
- 1...exf5
- 2.Sc3#
- 2.Qg2#
- 2.Qxf5#
- 1...Qe5
- 2.Sc3#
- 2.Rxe5#
- 2.Qg2#
- 2.Qf3#
- 1...e5
- 2.Sc3#
- 2.Rxe5#
- 2.Qg2#
- 2.Qf3#
- 1...Qf6
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qg7
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qh2
- 2.Sc3#
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qe3#
- 2.Qf3#
- 2.Qf4#
- 1...Qh3
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qf3#
- 2.Qf4#
- 1...Qh4
- 2.Sc3#
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 1...Qh5
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qf4#
- 1...Qh6
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qh7
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qb8
- 2.Sc3#
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 1...Qc8
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qe8
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qf8
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qg8
- 2.Sc3#
- 2.Re5#
- 2.Qe3#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qh1+!
- threat
- 1.Qc3?
- threat
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qa8+
- 2.Ra5#
- 1...Qxd4
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Qxd4#
- 1...exf5
- 2.Qc6#
- 1...Qe5
- 2.Rxe5#
- 2.Qf3#
- 1...e5
- 2.Rxe5#
- 2.Qf3#
- 2.Qc6#
- 1...Qf6
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qg7
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qh3
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qh5
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qc6#
- 1...Qh6
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qh7
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qc8
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 1...Qd8
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 1...Qe8
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 1...Qf8
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qg8
- 2.Re5#
- 2.Qd3#
- 2.Qe3#
- 2.Qf3#
- 2.Qc6#
- 1...Qh1+!
- threat
- 1.Qa5?
- threat
- 2.Rf1#
- 2.Rf2#
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rf8#
- 1...Qh1+
- 2.Rf1#
- 1...exf5
- 2.Qxf5#
- 1...Qe5
- 2.Rf4#
- 2.Qxe5#
- 1...Qf6
- 2.Rf4#
- 2.Rxf6#
- 2.Qa8#
- 1...Qg7
- 2.Rf4#
- 1...Qh3
- 2.Rf4#
- 2.Qe5#
- 2.Qa8#
- 1...Qh5
- 2.Rf4#
- 2.Qe5#
- 2.Qa8#
- 1...Qh6
- 2.Rf4#
- 2.Qe5#
- 2.Qa8#
- 1...Qh7
- 2.Rf4#
- 2.Qe5#
- 1...Qe8
- 2.Rf4#
- 2.Rf7#
- 2.Qe5#
- 1...Qf8
- 2.Rf4#
- 2.Rf6#
- 2.Rf7#
- 2.Rxf8#
- 2.Qe5#
- 1...Qg8
- 2.Rf4#
- 2.Qe5#
- 1...Qxd4+!
- threat
- 1.Qd1?
- threat
- 2.Sc3#
- 2.Qd3#
- 1...Qxd4+
- 2.Qxd4#
- 1...exf5
- 2.Sc3#
- 1...Qe5
- 2.Sc3#
- 2.Qh1#
- 1...e5
- 2.Sc3#
- 1...Qh1
- 2.Sc3#
- 2.Qxh1#
- 1...Qc8
- 2.Qh1#
- 2.Qd3#
- 1...Qa8+!
- threat
- 1.Qf1?
- threat
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qa8+
- 2.Ra5#
- 1...exf5
- 2.Qg2#
- 2.Qxf5#
- 1...Qe5
- 2.Rxe5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 1...e5
- 2.Rxe5#
- 2.Qg2#
- 2.Qf3#
- 1...Qf6
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 2.Qf4#
- 1...Qg7
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 2.Qf4#
- 1...Qh1
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qxh1#
- 1...Qh2
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qf3#
- 2.Qf4#
- 1...Qh3
- 2.Re5#
- 2.Qf3#
- 2.Qf4#
- 1...Qh4
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qg2#
- 2.Qf3#
- 1...Qh5
- 2.Re5#
- 2.Qf4#
- 1...Qh6
- 2.Re5#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qh7
- 2.Re5#
- 2.Qg2#
- 2.Qf3#
- 2.Qf4#
- 1...Qb8
- 2.Ra5#
- 2.Rb5#
- 2.Rc5#
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 1...Qe8
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 2.Qf4#
- 1...Qf8
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 2.Qf4#
- 1...Qg8
- 2.Re5#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 2.Qf4#
- 1...Qxd4+!
- threat
- 1.Qg1?
- threat
- 2.Sc3#
- 2.Qe3#
- 2.Qg2#
- 1...Qxd4+
- 2.Qxd4#
- 1...exf5
- 2.Qg2#
- 1...Qe5
- 2.Sc3#
- 2.Qh1#
- 2.Qg2#
- 1...e5
- 2.Sc3#
- 2.Qg2#
- 1...Qh1
- 2.Sc3#
- 2.Qxh1#
- 1...Qh2
- 2.Sc3#
- 2.Qe3#
- 1...Qh3
- 2.Sc3#
- 2.Qe3#
- 1...Qh5
- 2.Sc3#
- 2.Qe3#
- 1...Qc8
- 2.Qe3#
- 2.Qh1#
- 2.Qg2#
- 1...Qa8+!
- threat
- 1.Qf2?
- Keys
- 1.Qb4!
- threat
- 2.Sc3#
- 2.Qb7#
- 1...Qxd4+
- 2.Qxd4#
- 1...Qh1+
- 2.Bg1#
- 1...Qa8+
- 2.Ba7#
- 1...exf5
- 2.Qb7#
- 1...Qe5
- 2.Sc3#
- 1...Qg7
- 2.Sc3#
- 1...Qh7
- 2.Sc3#
- 2.Bg1#
- 2.Bf2#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- 1...Qb8
- 2.Sc3#
- 2.Bb6#
- 1...Qc8
- 2.Bc5#
- 1...Qd8
- 2.Sc3#
- 1...Qe8
- 2.Sc3#
- 2.Bg1#
- 2.Bf2#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- threat
- 1.Qb4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 6
- ADDED MATES = 2
- REMOVED MATES = 5
- Sets
- Q(c);CHECK,SBLOCK,XB(F)::QAR(B)+S(D),DCHECK
- Q(c);N_GUARD::QAB(B)
- Q(c);N_GUARD,N_PINB(F),P_PINQ(B)::QAB(B),XQ(c)
- Q(c);N_GUARD,N_PINB(F)::QAB(B)
- Tries
- Try
- Q(B);
- Threat
- DUALS(9)
- Vars
- Q(c);CHECK,XB(F)::QAR1(B),XQ(c)
- Q(c);CHECK,N_PINB(F)::B(I)+R(G)
- Refutation
- Q(c);CHECK,N_PINB(F)
- Try
- Q(B);N_SPINB(F)
- Threat
- DUALS(8)
- Vars
- Q(c);CHECK::B(I)+R(G)
- P(b);P_SPINP(b),XR(G)::QAB(B)
- Refutation
- Q(c);CHECK
- Try
- Q(B);
- Threat
- DUALS(6)
- Vars
- Q(c);CHECK,N_PINB(F)::B(I)+R(G)
- P(b);P_SPINP(b),XR(G)::QAB1(B),XP(b)
- Q(c);::B(I)+R(G),DCHECK
- Refutation
- Q(c);CHECK,XB(F)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- Q(c);CHECK,XB(F)::QAR1(B),XQ(c)
- P(b);P_SPINP(b),XR(G)::S(D)
- P(b);N_PINB(F)::S(D)
- Refutation
- Q(c);CHECK,N_PINB(F)
- Try
- Q(B);
- Threat
- DUALS(7)
- Vars
- Q(c);CHECK,N_PINB(F)::B(I)+R(G)
- Refutation
- Q(c);CHECK,XB(F)
- Try
- Q(B);
- Threat
- DUALS(3)
- Vars
- Q(c);CHECK,XB(F)::QAR1(B),XQ(c)
- P(b);P_SPINP(b),XR(G)::QAB(B)
- Refutation
- Q(c);CHECK,N_PINB(F)
- Try
- Actual
- Q(B);
- Threat
- DUALS(2)
- Vars
- Q(c);CHECK,P_SPINQ(c),XB(F)::QAR1(B),XQ(c)
- Q(c);CHECK,N_PINB(F)::QAR(B)+B(F)
- P(b);P_SPINP(b),XR(G)::QAB(B)
- Q(c);::S(D)
- Q(c);N_PINB(F)::QAR(B)+B(F)
- Q(c);N_PINB(F)::S(D)
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).