MESON Chess Problem Database

Problem Display
PID: 249976 (8/8/2B5/8/2R3p1/3N2Rb/2K1P1qp/7k w - - 0 1)

Unho, Pekka

Stella Polaris, 1969

8/8/2B5/8/2R3p1/3N2Rb/2K1P1qp/7k

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Sf2#
    • 1...Qd5
      • 2.Sf2#
    • 1...Qxc6
      • 2.Sf2#
  • Tries
    • 1.Kb1?
      • threat
        • 2.Rc1#
      • 1...Kg1
        • 2.Rc1#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qf3
        • 2.Sf2#
      • 1...Qd5
        • 2.Sf2#
      • 1...Qe4!
    • 1.Kc1?
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qf3
        • 2.Sf2#
      • 1...Qe4
        • 2.Sf2#
      • 1...Qd5
        • 2.Sf2#
      • 1...Kg1!
    • 1.Kd2?
      • threat
        • 2.Rc1#
      • 1...Kg1
        • 2.Rc1#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qf3
        • 2.Sf2#
      • 1...Qe4
        • 2.Sf2#
      • 1...Qd5!
    • 1.Kb3?
      • threat
        • 2.Rc1#
      • 1...Kg1
        • 2.Rc1#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qd5
        • 2.Sf2#
      • 1...Qe4
        • 2.Sf2#
      • 1...Qf3!
  • Keys
    • 1.Kb2!
      • threat
        • 2.Rc1#
      • 1...Kg1
        • 2.Rc1#
      • 1...Qxc6
        • 2.Sf2#
      • 1...Qf3
        • 2.Sf2#
      • 1...Qe4
        • 2.Sf2#
      • 1...Qd5
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_PINP(B)::S(C)
    • Q(b);N_PINP(B),N_SPINQ(b),P_PINR(E),XB(F)::S(C)
  • Tries
    • Try
      • K(A);N_SPINP(B),S_FLIGHT
      • Threat
        • R(E)
      • Vars
        • K(a);P-FLIGHT::R(E)
        • Q(b);N_SPINQ(b),XB(F)::S(C)
        • Q(b);::S(C)
      • Refutation
        • Q(b);P_PINS(C)
    • Try
      • K(A);N_SPINP(B),P-FLIGHT
      • Vars
        • Q(b);N_SPINQ(b),P_PINR(E),XB(F)::S(C)
        • Q(b);::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(A);P-FLIGHT
      • Threat
        • R(E)
      • Vars
        • K(a);P-FLIGHT::R(E)
        • Q(b);N_PINP(B),N_SPINQ(b),XB(F)::S(C)
        • Q(b);N_PINP(B)::S(C)
      • Refutation
        • Q(b);N_PINP(B),P_PINS(C)
    • Try
      • K(A);N_SPINP(B),S_FLIGHT
      • Threat
        • R(E)
      • Vars
        • K(a);P-FLIGHT::R(E)
        • Q(b);N_SPINQ(b),XB(F)::S(C)
        • Q(b);P_PINR(E)::S(C)
        • Q(b);::S(C)
      • Refutation
        • Q(b);P_PINS(C)
  • Actual
    • K(A);P-FLIGHT
    • Threat
      • R(E)
    • Vars
      • K(a);P-FLIGHT::R(E)
      • Q(b);N_PINP(B),N_SPINQ(b),XB(F)::S(C)
      • Q(b);N_PINP(B)::S(C)
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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).