MESON Chess Problem Database

Problem Display
PID: 154127 (8/4BBk1/6P1/4P1Qn/8/8/8/4K3 w - - 0 1)

Harley, Brian

The Observer, 1955

(First published on Sun Jan 9 1955)

8/4BBk1/6P1/4P1Qn/8/8/8/4K3

#2

6 + 2

15290 Harley Scrapbook 2015
5454 Near Snap 2018
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kh8
      • 2.Qh6#
  • Tries
    • 1.Bf8+?
      • 1...Kh8
        • 2.Qh6#
        • 2.Qxh5#
      • 1...Kxf8!
    • 1.Qf6+?
      • 1...Kh6
        • 2.Qh8#
      • 1...Sxf6!
  • Keys
    • 1.Qh4!
      • 1...Kh6
        • 2.Bf8#
      • 1...Kh8
        • 2.Bf6#
      • 1...Sg3
        • 2.Qh7#
      • 1...Sf4
        • 2.Qh7#
      • 1...Sf6
        • 2.exf6#

Anticipated by 69412(1897)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAR2(C)
  • Tries
    • Try
      • B(E);CHECK
      • Refutation
        • K(b);S_FLIGHT,XB(E)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR2(C)
      • Refutation
        • S(a);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT::B(E)
      • S(a);OGATE::QAR1(C)
      • S(a);OGATE::P(B),XS(a)
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