MESON Chess Problem Database

Problem Display
PID: 153777 (4K1Nn/7k/2n3pP/3Q4/8/2B5/8/6R1 w - - 0 1)

Harley, Brian

The Observer, 1948

(First published on Sun Jan 4 1948)

4K1Nn/7k/2n3pP/3Q4/8/2B5/8/6R1

#2

6 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sf7
      • 2.Qxf7#
  • Tries
    • 1.Rh1?
      • threat
        • 2.Sf6#
      • 1...Sf7
        • 2.Qxf7#
      • 1...g5!
    • 1.Rxg6?
      • threat
        • 2.Rg7#
      • 1...Sxg6
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Kxg6!
    • 1.Qe5?
      • threat
        • 2.Qg7#
        • 2.Qxh8#
      • 1...Kxg8
        • 2.Qg7#
        • 2.Qxh8#
      • 1...g5
        • 2.Qg7#
      • 1...Sd4
        • 2.Qg7#
      • 1...Sf7
        • 2.Qg7#
      • 1...Sxe5!
    • 1.Qg5?
      • threat
        • 2.Sf6#
      • 1...Sf7
        • 2.Qxg6#
      • 1...Kxg8!
    • 1.Qd7+?
      • 1...Kxg8
        • 2.Qg7#
        • 2.h7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Se7!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Sf6#
      • 1...Kxg8
        • 2.h7#
      • 1...gxh5
        • 2.Rg7#
      • 1...Sf7
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAR2(C),XS(d)
  • Tries
    • Try
      • R(A);
      • Threat
        • S(F)
      • Vars
        • S(d);N_GUARD::QAR2(C),XS(d)
      • Refutation
        • P(b);
    • Try
      • R(A);XP(b)
      • Threat
        • R1(A)
      • Vars
        • S(d);N_GUARD,XR(A)::QAR2(C)
        • S(d);N_GUARD::QAR2(C),XS(d)
      • Refutation
        • K(c);S_FLIGHT,XR(A)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(C)
        • S(a);::QAR1(C)
        • S(d);::QAR1(C)
      • Refutation
        • S(a);XQ(C)
    • Try
      • Q(C);
      • Threat
        • S(F)
      • Vars
        • S(d);N_GUARD::QAB1(C),XP(b)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT,XS(F)
    • Try
      • Q(C);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAR2(C),XS(d)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(C);
    • Threat
      • S(F)
    • Vars
      • K(c);OGATE,P_SPINP(b),S_FLIGHT,XS(F)::P(D)
      • P(b);OGATE,XQ(C)::R1(A)
      • S(d);N_GUARD::QAB1(C),XP(b)
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