MESON Chess Problem Database

Problem Display
PID: 153714 (6R1/8/5NK1/7N/7k/7p/7b/5R1n w - - 0 1)

Harley, Brian

The Observer, 1947

(First published on Sun Sep 7 1947)

6R1/8/5NK1/7N/7k/7p/7b/5R1n

#2

5 + 4

15290 Harley Scrapbook 2015
56 The Problemist 2015
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Rf4#
    • 1...Bf4
      • 2.Rxf4#
    • 1...Sg3
      • 2.Rf4#
  • Tries
    • 1.Kh6?
      • threat
        • 2.Rg4#
      • 1...Bf4+
        • 2.Rxf4#
      • 1...Sf2!
    • 1.Sg7?
      • threat
        • 2.Sf5#
      • 1...Sg3
        • 2.Rf4#
      • 1...Kg3!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Sf5#
      • 1...Kxg3
        • 2.Kh5#
      • 1...Bxg3
        • 2.Rh8#
      • 1...Sxg3
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(b);N_GUARD::R(A)
    • B(b);N_GUARD::R(A),XB(b)
    • S(a);S_CUTB(b)::R(A)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • R1(E)
      • Vars
        • B(b);CHECK,N_GUARD::R(A),XB(b)
      • Refutation
        • S(a);
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • S(a);SBLOCK,S_CUTB(b)::R(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(d);S_FLIGHT,XS(B)::R(E)+K(D)
      • B(b);SBLOCK,XS(B)::R(E)
      • S(a);SBLOCK,XS(B)::R(A)
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