MESON Chess Problem Database

Problem Display
PID: 184929 (k1K5/p7/4n3/n2N4/8/8/8/6Q1 w - - 0 1)

Harley, Ella Margaret

The Observer, 1929

(First published on Sun May 5 1929)

k1K5/p7/4n3/n2N4/8/8/8/6Q1

#2

3 + 4

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Sc7#
    • 1...Sf4
      • 2.Sc7#
    • 1...Sc5
      • 2.Sc7#
    • 1...Sg5
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Sg7
      • 2.Sc7#
    • 1...Sd8
      • 2.Sc7#
    • 1...Sf8
      • 2.Sc7#
  • Tries
    • 1.Qh2?
      • threat
        • 2.Qb8#
      • 1...Sf4
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sc6!
    • 1.Qb6?
      • threat
        • 2.Qb8#
      • 1...Sc6
        • 2.Qxc6#
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...axb6!
    • 1.Qb1?
      • threat
        • 2.Qb8#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sb3!
    • 1.Qg3?
      • threat
        • 2.Qb8#
      • 1...Sf4
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sc6!
  • Keys
    • 1.Qg7!
      • 1...Sxg7
        • 2.Sc7#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sb3
        • 2.Qb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sd4
        • 2.Sc7#
      • 1...Sf4
        • 2.Sc7#
      • 1...Sc5
        • 2.Sc7#
      • 1...Sg5
        • 2.Sc7#
      • 1...Sc7
        • 2.Sxc7#
      • 1...Sd8
        • 2.Sc7#
      • 1...Sf8
        • 2.Sc7#
      • 1...a6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::S(B)
    • S(b);N_GUARD::S(B),XS(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(b);N_GUARD::S(B)
        • S(b);N_GUARD::S(B),XS(b)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(a);N_GUARD::QAB1(A),XS(a)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(a);N_GUARD::QAB1(A)
        • S(a);N_GUARD::QAB1(A),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(b);N_GUARD::S(B)
        • S(b);N_GUARD::S(B),XS(b)
      • Refutation
        • S(a);
  • Actual
    • Q(A);
    • Vars
      • S(b);N_GUARD,XQ(A)::S(B)
      • S(a);N_GUARD::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • S(b);N_GUARD::S(B)
      • S(b);N_GUARD::S(B),XS(b)
      • P(c);N_GUARD::S(B)
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