MESON Chess Problem Database

Problem Display
PID: 31099 (2nbb1B1/5PRN/2pk4/8/1RPp4/3Q1K2/8/8 w - - 0 1)

White, Alain Campbell

Pittsburgh Sunday Post, 1927

(First published on Sun Jan 23 1927)

2nbb1B1/5PRN/2pk4/8/1RPp4/3Q1K2/8/8

#2

8 + 6

20 De Problemist 1927
145 StrateGems 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc7
      • 2.fxe8S#
    • 1...Ke7
      • 2.f8Q#
      • 2.f8B#
  • Tries
    • 1.Qxd4+?
      • 1...Kc7
        • 2.fxe8S#
      • 1...Ke7
        • 2.f8Q#
        • 2.f8B#
      • 1...Ke6!
    • 1.fxe8S+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Kc5!
  • Keys
    • 1.c5+!
      • 1...Kxc5
        • 2.Qxd4#
      • 1...Kd5
        • 2.Qf5#
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Kc7
        • 2.fxe8S#
      • 1...Kd7
        • 2.f8S#
      • 1...Ke7
        • 2.f8Q#
        • 2.f8B#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINP(a),S_FLIGHT::PXB(f)=S
    • K(c);N_SPINP(a),S_FLIGHT::P=Q
  • Tries
    • Try
      • Q(A);CHECK,XP(a)
      • Vars
        • K(c);S_FLIGHT::PXB(f)=S
        • K(c);S_FLIGHT::P=Q
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(E);CHECK,XB(f)
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAR1(A)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
  • Actual
    • P(D);CHECK
    • Vars
      • K(c);N_SPINP(a),S_FLIGHT,XP(D)::QAB1(A),XP(a)
      • K(c);P-FLIGHT::QAR2(A)
      • K(c);N_SPINP(a),S_FLIGHT::QAR1(A)
      • K(c);N_SPINP(a),P-FLIGHT::PXB(f)=Q
      • K(c);N_SPINP(a),S_FLIGHT::PXB(f)=S
      • K(c);P-FLIGHT::P=S
      • K(c);N_SPINP(a),S_FLIGHT::P=Q
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