MESON Chess Problem Database

Problem Display
PID: 153797 (8/4b2K/8/7k/1nR5/4BPp1/4Q3/8 w - - 0 1)

Harley, Brian

The Observer, 1949

(First published on Sun Sep 4 1949)

8/4b2K/8/7k/1nR5/4BPp1/4Q3/8

#2

5 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bh4
      • 2.f4#
  • Tries
    • 1.Rh4+?
      • 1...Bxh4
        • 2.f4#
      • 1...Kxh4!
    • 1.Qh2+?
      • 1...Bh4
        • 2.Rxh4#
        • 2.Qxh4#
      • 1...gxh2!
  • Keys
    • 1.Bg5!
      • threat
        • 2.f4#
      • 1...Kxg5
        • 2.Qe5#
      • 1...Bxg5
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(d);SBLOCK::QAB(A)+P(C)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • B(d);SBLOCK,XR(D)::QAB(A)+P(C)
      • Refutation
        • K(c);P-FLIGHT,XR(D)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(a);XQ(A)
  • Actual
    • B(B);
    • Threat
      • QAB(A)+P(C)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XB(B)::QAR2(A)
      • B(d);OGATE,SBLOCK,XB(B)::QAB(A)
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Developed and maintained by Brian Stephenson.
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