MESON Chess Problem Database

Problem Display
PID: 337 (2B1bK1Q/3q4/6P1/3p4/1p5N/1Rb4k/6RP/8 w - - 0 1)

Harley, Brian

Harley, Ella Margaret

The Observer, 1926

(First published on Sun Mar 14 1926)

2B1bK1Q/3q4/6P1/3p4/1p5N/1Rb4k/6RP/8

#2

8 + 6

887 Mate in Two Moves 1931
15290 Harley Scrapbook 2014
56 The Problemist 2015
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qg4
      • 2.Bxg4#
    • 1...Qf5+
      • 2.Bxf5#
    • 1...Qe6
      • 2.Bxe6#
  • Tries
    • 1.Sf3+?
      • 1...Bxh8
        • 2.Rg3#
      • 1...Kxg2!
    • 1.Rg5?
      • threat
        • 2.Sg2#
      • 1...Qf5+
        • 2.Sxf5#
      • 1...Kxh2
        • 2.Sf3#
      • 1...Bxg6
        • 2.Sxg6#
      • 1...Qg4!
  • Keys
    • 1.Rg1!
      • 1...Qf5+
        • 2.Sxf5#
      • 1...Kxh2
        • 2.Sf3#
      • 1...Qxc8
        • 2.Sf5#
      • 1...Bxg6
        • 2.Sxg6#
      • 1...Qg4
        • 2.Sg2#
      • 1...Qe6
        • 2.Sf5#
      • 1...Bf7
        • 2.Sf5#
      • 1...d4
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • Q(e);OGATE::B(F),XQ(e)
    • Q(e);CHECK,OGATE::B(F),XQ(e)
  • Tries
    • Try
      • S(D);CHECK,N_PINB(a)
      • Vars
        • B(a);XQ(H)::R1(A)
      • Refutation
        • K(b);N_SPINQ(e),S_FLIGHT,XR(A)
    • Try
      • R(A);
      • Threat
        • QAR(H)+S(D)
      • Vars
        • Q(e);CHECK,N_GUARD::QAR(H)+S(D),XQ(e)
        • K(b);N_SPINB(a),N_SPINQ(e),P-FLIGHT,XP(B)::QAR(H)+S(D),DCHECK
        • B(f);XP(E)::QAR(H)+S(D),XB(f)
      • Refutation
        • Q(e);
  • Actual
    • R(A);
    • Vars
      • Q(e);CHECK,N_GUARD::QAR(H)+S(D),XQ(e)
      • K(b);N_SPINB(a),N_SPINQ(e),P-FLIGHT,XP(B)::QAR(H)+S(D),DCHECK
      • Q(e);N_GUARD,N_SPINQ(e),XB(F)::QAR(H)+S(D)
      • B(f);XP(E)::QAR(H)+S(D),XB(f)
      • Q(e);::QAR(H)+S(D)
      • Q(e);N_GUARD::QAR(H)+S(D)
      • B(f);::QAR(H)+S(D)
      • P(d);::QAR(H)+S(D)
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