MESON Chess Problem Database

Problem Display
PID: 153859 (5K2/6Pr/6R1/5p2/6Nk/4Q3/8/7r w - - 0 1)

Harley, Brian

The Observer, 1950

(First published on Sun May 7 1950)

5K2/6Pr/6R1/5p2/6Nk/4Q3/8/7r

#2

5 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh5
      • 2.Qg5#
    • 1...Rh8+
      • 2.gxh8Q#
      • 2.gxh8R#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Qg5#
      • 1...Rh8+
        • 2.gxh8Q#
        • 2.gxh8R#
      • 1...Kh5
        • 2.Qg5#
      • 1...Rg1
        • 2.Qh3#
      • 1...Rh5
        • 2.Qf4#
        • 2.Qg3#
      • 1...f4!
    • 1.Sf6?
      • threat
        • 2.Qg3#
      • 1...Rh8+
        • 2.gxh8Q#
        • 2.gxh8R#
      • 1...Rh3
        • 2.Qf4#
        • 2.Qg5#
      • 1...f4
        • 2.Rg4#
      • 1...Rg1!
    • 1.Qg3+?
      • 1...Kh5
        • 2.Sf6#
      • 1...Kxg3!
  • Keys
    • 1.Qf4!
      • 1...Rh8+
        • 2.gxh8Q#
        • 2.gxh8R#
      • 1...Kh3
        • 2.Sf2#
      • 1...Kh5
        • 2.Qg5#
      • 1...Rxg7
        • 2.Rh6#
      • 1...fxg4
        • 2.Qxg4#
      • 1...Ra1
        • 2.Qh2#
      • 1...Rb1
        • 2.Qh2#
      • 1...Rc1
        • 2.Qh2#
      • 1...Rd1
        • 2.Qh2#
      • 1...Re1
        • 2.Qh2#
      • 1...Rf1
        • 2.Qh2#
      • 1...Rg1
        • 2.Qh2#
      • 1...Rh2
        • 2.Qxh2#
      • 1...Rh3
        • 2.Sf6#
      • 1...Rh5
        • 2.Sf2#
      • 1...Rh6
        • 2.Rxh6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(A)
    • R(d);CHECK,OGATE::PXR(d)=Q
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • R(d);CHECK,OGATE::PXR(d)=Q
        • K(b);P-FLIGHT::QAR1(A)
        • R(a);N_GUARD::QAR1(A)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • R(d);CHECK,OGATE::PXR(d)=Q
        • P(c);N_GUARD::R1(C)
      • Refutation
        • R(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::S(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Vars
      • R(d);CHECK,OGATE::PXR(d)=Q
      • K(b);P-FLIGHT::S(B)
      • K(b);P-FLIGHT::QAR1(A)
      • R(d);N_GUARD,XP(D)::R(C)
      • P(c);OGATE,P_SPINP(c),XS(B)::QAR1(A),XP(c)
      • R(a);N_GUARD::QAR2(A)
      • R(a);N_GUARD::QAR2(A),XR(a)
      • R(a);SBLOCK::QAR(A)+S(B)
      • R(d);SBLOCK::QAR(A)+S(B)
      • R(d);N_GUARD::R(C),XR(d)
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