MESON Chess Problem Database

Problem Display
PID: 529 (5Q2/8/n7/2r5/p4p2/k7/P1P5/K1R1B3 w - - 0 1)

Ling, John Francis

The Observer, 1959

5Q2/8/n7/2r5/p4p2/k7/P1P5/K1R1B3

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sc7
      • 2.Qxc5#
    • 1...Sb8
      • 2.Qxc5#
  • Tries
    • 1.Bc3?
      • 1...Sb4
        • 2.Bb2#
      • 1...Sc7
        • 2.Qxc5#
      • 1...Sb8
        • 2.Qxc5#
      • 1...f3!
    • 1.Rb1?
      • 1...Sb4
        • 2.Bxb4#
      • 1...Sc7
        • 2.Bb4#
        • 2.Qxc5#
      • 1...Sb8
        • 2.Bb4#
        • 2.Qxc5#
      • 1...f3!
    • 1.Qxc5+?
      • 1...Sb4
        • 2.Bxb4#
        • 2.Qxb4#
        • 2.Qc3#
      • 1...Sxc5!
  • Keys
    • 1.c4!
      • 1...Sb4
        • 2.Rc3#
      • 1...Sc7
        • 2.Qxc5#
      • 1...Sb8
        • 2.Qxc5#
      • 1...f3
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD::QAB(F),XR(d)
  • Tries
    • Try
      • B(C);
      • Vars
        • S(e);N_SPINR(d),SBLOCK::B(C)
        • S(e);N_GUARD::QAB(F),XR(d)
      • Refutation
        • P(c);
    • Try
      • R(B);
      • Vars
        • S(e);N_GUARD,N_SPINR(d)::B(C),XS(e)
      • Refutation
        • P(c);
    • Try
      • Q(F);CHECK,XR(d)
      • Refutation
        • S(e);XQ(F)
  • Actual
    • P(E);
    • Vars
      • S(e);N_SPINR(d),SBLOCK::R(B)
      • S(e);N_GUARD::QAB(F),XR(d)
      • P(c);OGATE::QAR(F),XP(c)
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