MESON Chess Problem Database

Problem Display
PID: 269421 (Q1Nrk1BR/1R1p3r/7p/1P6/7B/8/8/3K4 w - - 0 1)

Eddy, Edwin John

3rd Comm., The Observer, 1958

(First published on Sun Feb 16 1958)

Q1Nrk1BR/1R1p3r/7p/1P6/7B/8/8/3K4

#2

8 + 5

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Ba2#
      • 2.Bb3#
      • 2.Bc4#
      • 2.Bd5#
      • 2.Be6#
    • 1...Rxc8
      • 2.Qxc8#
    • 1...d5
      • 2.Bf7#
      • 2.Bxh7#
    • 1...d6
      • 2.Bf7#
      • 2.Bxh7#
  • Tries
    • 1.Qa2?
      • threat
        • 2.Bf7#
        • 2.Bxh7#
      • 1...Rxh8
        • 2.Qf7#
      • 1...Re7
        • 2.Bb3#
        • 2.Bc4#
        • 2.Bd5#
        • 2.Be6#
        • 2.Bf7#
        • 2.Bh7#
      • 1...Rf7
        • 2.Bxf7#
        • 2.Qxf7#
      • 1...Rg7
        • 2.Bf7#
      • 1...Kf8!
  • Keys
    • 1.Rxd7!
      • threat
        • 2.Rxd8#
      • 1...Rhxd7+
        • 2.Bd5#
      • 1...Rdxd7+
        • 2.Sd6#
      • 1...Kxd7
        • 2.Qc6#
      • 1...Kf8
        • 2.Bxh7#
      • 1...Rxc8
        • 2.Qxc8#
      • 1...Re7
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(d);OGATE,P_SPINR(d),XS(F)::QAR2(E),XR(d)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD,XR(H)::QAB1(E)
        • R(c);::R(H)+B(G),DCHECK
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • R(D);P_SPINR(D),XP(b)
    • Threat
      • R1(D),XR(d)
    • Vars
      • R(c);CHECK,N_GUARD,SBLOCK,XR(D)::R(H)+B(G)
      • R(d);CHECK,SBLOCK,XR(D)::QAR(E)+S(F),DCHECK
      • K(e);OGATEB,S_FLIGHT,XR(D)::QAB1(E)
      • K(e);N_GUARD,P-FLIGHT::R(H)+B(G),XR(c)
      • R(d);N_PINR(D),OGATE,P_SPINR(d),XS(F)::QAR2(E),XR(d)
      • R(c);N_GUARD::R(H)+B(G)
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