MESON Chess Problem Database

Problem Display
PID: 267770 (7K/P3b1P1/5prp/1R1PPQ2/8/2BP3b/k5BR/1N4qn w - - 0 1)

Ling, John Francis

The Problemist, 1955

7K/P3b1P1/5prp/1R1PPQ2/8/2BP3b/k5BR/1N4qn

#2

12 + 8

SOLUTION

  • SOUND
  • Tries
    • 1.a8Q+?
      • 1...Ba3
        • 2.Qxa3#
      • 1...Qa7!
    • 1.a8R+?
      • 1...Ba3
        • 2.Rxa3#
      • 1...Qa7!
  • Keys
    • 1.d6!
      • threat
        • 2.Bd5#
      • 1...Qxb1
        • 2.a8Q#
        • 2.a8R#
      • 1...Qxg2
        • 2.a8Q#
        • 2.a8R#
      • 1...Rxg2
        • 2.g8Q#
        • 2.g8B#
      • 1...Bxg2
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • P(J);CHECK
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::QAR1(J),XB(h)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • P(J);CHECK
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::R1(J),XB(h)
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • P(G);
    • Threat
      • R(C)+B(B),DCHECK
    • Vars
      • Q(a);N_GUARD,XS(A)::P=Q
      • Q(a);N_GUARD,P_SPINQ(a),XB(B)::P=Q
      • R(f);N_GUARD,P_SPINR(f),XB(B)::P=Q
      • B(d);N_GUARD,P_SPINB(d),XB(B)::QAB(I)
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