MESON Chess Problem Database

Problem Display
PID: 187567 (8/5b1B/K5PN/3p4/2p1kBrR/R5p1/4r3/2Q5 w - - 0 1)

Eddy, Edwin John

The Observer, 1936

(First published on Sun Feb 23 1936)

8/5b1B/K5PN/3p4/2p1kBrR/R5p1/4r3/2Q5

#2

8 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qe3#
    • 1...Rb2
      • 2.Qe3#
    • 1...Rc2
      • 2.Qe3#
    • 1...Rf2
      • 2.Qe3#
    • 1...Rg2
      • 2.Qe3#
    • 1...Rh2
      • 2.Qe3#
    • 1...Re3
      • 2.Qxe3#
    • 1...Rxf4
      • 2.Qxf4#
    • 1...Rxg6+
      • 2.Bd6#
  • Tries
    • 1.Re3+?
      • 1...Kxf4
        • 2.Rxg4#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...Kd4!
    • 1.gxf7+?
      • 1...Rg6+
        • 2.Bd6#
      • 1...Kd4!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qe5#
      • 1...Rxg6+
        • 2.Bd6#
      • 1...Kxf4
        • 2.Rxg4#
      • 1...Rxf4
        • 2.gxf7#
      • 1...Re3
        • 2.Qxe3#
      • 1...d4
        • 2.Qf3#
      • 1...Rg5
        • 2.Bxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(a);N_GUARD,P_PINR(B)::QAR1(A)
    • R(a);N_GUARD::QAR1(A)
    • R(a);N_GUARD::QAR1(A),XR(a)
    • R(e);OGATE,P_SPINR(e),XB(C)::QAR1(A),XR(e)
    • R(e);CHECK,OGATEB,P_SPINR(e),XP(F)::R(D)+B(C)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINR(e),XB(C)::R1(D),XR(e)
        • R(a);OGATE,XR(B)::QAR1(A),XR(a)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • P(F);CHECK,XB(g)
      • Vars
        • R(e);CHECK,P_SPINR(e)::R(D)+B(C)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(e);CHECK,OGATEB,P_SPINR(e),XP(F)::R(D)+B(C)
      • K(d);OGATEB,P-FLIGHT,P_SPINR(e),XB(C)::R1(D),XR(e)
      • R(e);N_GUARD,P_SPINR(e),XB(C)::B(H)+P(F),XB(g)
      • R(a);N_GUARD::QAR1(A),XR(a)
      • P(f);SBLOCK::QAB1(A)
      • R(e);OGATEB::R(D)+B(C),XR(e)
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