MESON Chess Problem Database
Problem Display
PID: 200022 (8/R2NK3/3PB3/7p/PkN3nr/8/2PPQ2p/R6q w - - 0 1)
Haring, Jacobus
Stella Polaris, 1966
#2
11 + 6
SOLUTION
- SOUND
- Sets
- 1...Qg2
- 2.Rb1#
- 1...Qe4
- 2.Rb1#
- 1...Qd5
- 2.Rb1#
- 1...Qc6
- 2.Rb1#
- 1...Qb7
- 2.Rb1#
- 2.Rxb7#
- 1...Qa8
- 2.Rb1#
- 1...Qb1
- 2.Rxb1#
- 2.Rb7#
- 1...Qc1
- 2.Rb7#
- 1...Qd1
- 2.Rb7#
- 1...Qe1
- 2.Rb7#
- 1...Qf1
- 2.Rb7#
- 1...Qg2
- Tries
- 1.Sa5?
- threat
- 2.Qc4#
- 2.Qb5#
- 2.c3#
- 1...Qd5
- 2.c3#
- 1...Qf3
- 2.Qc4#
- 2.Qb5#
- 1...Qe4
- 2.Qb5#
- 2.Qxe4#
- 2.c3#
- 1...Qc6
- 2.Sxc6#
- 1...Qb7
- 2.Qc4#
- 2.c3#
- 1...Qc1
- 2.Sc6#
- 2.Qc4#
- 2.Qb5#
- 2.Qe4#
- 1...Qf1
- 2.Sc6#
- 2.c3#
- 1...Rh3
- 2.Qc4#
- 2.Qb5#
- 1...Sf2
- 2.Qb5#
- 2.c3#
- 1...Se3
- 2.Qb5#
- 2.c3#
- 1...Se5
- 2.Qb5#
- 2.c3#
- 1...Sf6
- 2.Qb5#
- 2.c3#
- 1...Sh6
- 2.Qb5#
- 2.c3#
- 1...Qxa1!
- threat
- 1.Ra5?
- threat
- 2.Rb5#
- 1...Qd5
- 2.Rb1#
- 1...Qc6
- 2.Rb1#
- 1...Qb7
- 2.Rb1#
- 1...Qxa1!
- threat
- 1.Qd3?
- threat
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Qxa1
- 2.Qb3#
- 1...Qf3
- 2.Rb1#
- 1...Qd5
- 2.Rb1#
- 2.Qb3#
- 2.Qc3#
- 1...Qb1
- 2.Rxb1#
- 2.Rb7#
- 2.Qa3#
- 2.Qc3#
- 1...Qc1
- 2.Rb7#
- 2.Qb3#
- 2.Qc3#
- 1...Rh3!
- threat
- 1.Qf3?
- threat
- 2.Rb7#
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Qxa1
- 2.Qb7#
- 2.Qb3#
- 1...Qb1
- 2.Rxb1#
- 2.Rb7#
- 2.Qb7#
- 2.Qa3#
- 2.Qc3#
- 1...Qc1
- 2.Rb7#
- 2.Qb7#
- 2.Qb3#
- 2.Qc3#
- 1...Qg1
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Rh3
- 2.Rb7#
- 1...Se3
- 2.Rb7#
- 1...Qxf3!
- threat
- 1.Qe1?
- threat
- 2.Rb1#
- 1...Qxe1
- 2.Rb7#
- 1...Qd5
- 2.d3#
- 1...Qf3
- 2.d3#
- 1...Rh3!
- threat
- 1.Qg2?
- threat
- 2.Rb7#
- 1...Qxg2
- 2.Rb1#
- 1...Qxa1
- 2.Qb7#
- 1...Qg1!
- threat
- 1.Qe3?
- threat
- 2.Qc5#
- 2.Qb6#
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Qxa1
- 2.Qc5#
- 2.Qb6#
- 2.Qb3#
- 1...Qd5
- 2.Qb3#
- 2.Qc3#
- 1...Qf3
- 2.Rb1#
- 2.Qc5#
- 2.Qb6#
- 1...Qc6
- 2.Rb1#
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Qb7
- 2.Rb1#
- 2.Rxb7#
- 2.Qc5#
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Qb1
- 2.Rxb1#
- 2.Rb7#
- 2.Qc5#
- 2.Qb6#
- 2.Qa3#
- 2.Qc3#
- 1...Qc1
- 2.Rb7#
- 2.Qc5#
- 2.Qb6#
- 2.Qb3#
- 2.Qc3#
- 1...Qg1
- 2.Rb7#
- 2.Qa3#
- 2.Qb3#
- 2.Qc3#
- 1...Rh3
- 2.Qc5#
- 2.Qb6#
- 1...Sxe3!
- threat
- 1.Qe5?
- threat
- 2.Qb2#
- 2.Qc3#
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Qxa1
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Qd5
- 2.Qc3#
- 1...Qf3
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Qc6
- 2.Rb1#
- 2.Qb2#
- 2.Qc3#
- 2.Qa5#
- 1...Qb7
- 2.Rb1#
- 2.Rxb7#
- 2.Qb2#
- 2.Qc3#
- 2.Qa5#
- 2.Qc5#
- 1...Qb1
- 2.Rxb1#
- 2.Rb7#
- 2.Qc3#
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Qc1
- 2.Rb7#
- 2.Qc3#
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Qg1
- 2.Qb2#
- 2.Qc3#
- 2.Qa5#
- 2.Qb5#
- 1...Rh3
- 2.Qa5#
- 2.Qb5#
- 2.Qc5#
- 1...Sxe5!
- threat
- 1.Sa5?
- Keys
- 1.Qe4!
- threat
- 2.Rb7#
- 1...Qxe4
- 2.Rb1#
- 1...Qxa1
- 2.Qb7#
- 1...Qg1
- 2.Se3#
- threat
- 1.Qe4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 8
- Sets
- Q(a);N_GUARD::R(A)
- Q(a);N_GUARD,P_PINB(H)::R(A)
- Q(a);N_GUARD::R(I)
- Tries
- Try
- S(F);
- Threat
- DUALS(3)
- Vars
- Q(a);::P(B)
- Q(a);N_GUARD::S(F),XQ(a)
- Refutation
- Q(a);XR(A)
- Try
- R(I);
- Threat
- R1(I)
- Vars
- Q(a);N_GUARD::R(A)
- Q(a);N_GUARD,P_PINS(J)::R(A)
- Refutation
- Q(a);XR(A)
- Try
- Q(D);
- Threat
- DUALS(3)
- Vars
- Q(a);XR(A)::QAR1(D)
- Q(a);N_GUARD::R(A)
- Refutation
- R(e);
- Try
- Q(D);
- Threat
- DUALS(4)
- Vars
- R(e);::R(I)
- S(d);::R(I)
- Refutation
- Q(a);XQ(D)
- Try
- Q(D);
- Threat
- R(A)
- Vars
- Q(a);N_GUARD,P_PINB(H),XQ(D)::R(I)
- Q(a);N_GUARD::QAB(D)+P(C)
- Refutation
- R(e);
- Try
- Q(D);
- Threat
- R(I)
- Vars
- Q(a);N_GUARD,XQ(D)::R(A)
- Q(a);N_GUARD,XR(A)::QAR(D)
- Refutation
- Q(a);
- Try
- Q(D);
- Threat
- DUALS(5)
- Refutation
- S(d);XQ(D)
- Try
- Q(D);
- Threat
- DUALS(5)
- Vars
- Q(a);::QAB1(D)
- Refutation
- S(d);XQ(D)
- Try
- Actual
- Q(D);
- Threat
- R(I)
- Vars
- Q(a);N_GUARD,P_PINB(H),XQ(D)::R(A)
- Q(a);N_GUARD,XR(A)::QAR(D)
- Q(a);N_GUARD::QAR(D)+S(F)
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).