MESON Chess Problem Database

Problem Display
PID: 152638 (n1N2q2/Ppk2P2/1p4R1/1P6/1B1RpNB1/4K3/6Q1/8 w - - 0 1)

Harley, Brian

The Observer, 1931

(First published on Sun Mar 29 1931)

n1N2q2/Ppk2P2/1p4R1/1P6/1B1RpNB1/4K3/6Q1/8

#2

11 + 6

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qh6
      • 2.Qc2#
    • 1...Qg7
      • 2.Qc2#
    • 1...Qxc8
      • 2.Qc2#
    • 1...Qd8
      • 2.Rc4#
      • 2.Qc2#
    • 1...Qe8
      • 2.fxe8S#
    • 1...Qg8
      • 2.Qc2#
    • 1...Qh8
      • 2.Qc2#
  • Tries
    • 1.Se7?
      • threat
        • 2.Se6#
        • 2.Rd7#
        • 2.Qc2#
      • 1...Qxf7
        • 2.Rd7#
      • 1...Qh6
        • 2.Rd7#
        • 2.Qc2#
      • 1...Qc8
        • 2.Qc2#
      • 1...Qd8
        • 2.Se6#
        • 2.Rc4#
        • 2.Qc2#
      • 1...Qe8
        • 2.Se6#
        • 2.fxe8S#
      • 1...Qxe7!
    • 1.Be7?
      • threat
        • 2.Sd5#
        • 2.Rc4#
        • 2.Qc2#
      • 1...Qxf7
        • 2.Bd8#
      • 1...Qh6
        • 2.Bd8#
        • 2.Rc4#
        • 2.Qc2#
      • 1...Qd8
        • 2.Bxd8#
        • 2.Rc4#
        • 2.Qc2#
      • 1...Qe8
        • 2.Sd5#
        • 2.fxe8S#
      • 1...Qxe7!
  • Keys
    • 1.Rg8!
      • 1...Qxb4
        • 2.Sd5#
        • 2.Se6#
        • 2.Rd7#
      • 1...Qxf7
        • 2.Bd6#
      • 1...Qxc8
        • 2.Sd5#
        • 2.Bd6#
        • 2.Rc4#
        • 2.Rxc8#
        • 2.Qc2#
      • 1...Qxg8
        • 2.Qc2#
      • 1...Qc5
        • 2.Se6#
      • 1...Qd6
        • 2.Bxd6#
      • 1...Qh6
        • 2.Rd7#
      • 1...Qe7
        • 2.Sd5#
      • 1...Qg7
        • 2.Sd5#
        • 2.Se6#
        • 2.Bd6#
        • 2.Rc4#
        • 2.Rd7#
        • 2.Qc2#
      • 1...Qd8
        • 2.Rc4#
        • 2.Qc2#
      • 1...Qe8
        • 2.fxe8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(f);N_GUARD,P_PINS(E)::QAR(A)
    • Q(f);N_GUARD::QAR(A)
    • Q(f);N_GUARD,XS(K)::QAR(A)
    • Q(f);OGATE::PXQ(f)=S
  • Tries
    • Try
      • S(K);
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);XP(J)::R1(D)
        • Q(f);::QAR(A)
      • Refutation
        • Q(f);XS(K)
    • Try
      • B(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);N_GUARD,XP(J)::B(C)
      • Refutation
        • Q(f);XB(C)
  • Actual
    • R(H);
    • Vars
      • Q(f);N_GUARD,XP(J)::B(C)
      • Q(f);N_GUARD,XR(H)::QAR(A)
      • Q(f);P_PINR(D)::S(E)
      • Q(f);N_GUARD::B(C),XQ(f)
      • Q(f);P_PINS(E)::R1(D)
      • Q(f);::S(E)
      • Q(f);OGATE::PXQ(f)=S
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