MESON Chess Problem Database

Problem Display
PID: 266987 (1Bb2b1r/p2kPR1q/pP3Pp1/Nn6/1K1p4/8/4Q3/8 w - - 0 1)

Pepler, CB

Shannon, J

Sunday Referee, 1938

(First published on Sun Feb 13 1938)

1Bb2b1r/p2kPR1q/pP3Pp1/Nn6/1K1p4/8/4Q3/8

#2

8 + 10

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke8
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh1
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh2
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh3
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh4
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh5
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Qh6
      • 2.exf8Q#
      • 2.exf8R#
    • 1...Bh6
      • 2.e8Q#
    • 1...Bxe7+
      • 2.Qxe7#
    • 1...Bg7
      • 2.e8Q#
      • 2.e8R#
    • 1...Sd6
      • 2.e8Q#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Qc6#
      • 1...Bxe7+
        • 2.Qxe7#
      • 1...Ke8
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qh1
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Sd6
        • 2.e8Q#
      • 1...Bb7!
    • 1.Qe6+?
      • 1...Ke8
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Kxe6!
    • 1.exf8B+?
      • 1...Kd8
        • 2.Sc6#
        • 2.Qe7#
      • 1...Qxf7!
  • Keys
    • 1.exf8S+!
      • 1...Kd8
        • 2.Sc6#
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • K(f);S_FLIGHT::PXB(i)=Q
    • Q(g);N_GUARD::PXB(i)=Q
    • B(i);N_PINP(F)::P=Q
    • B(i);CHECK,OGATE,P_SPINB(i),XP(F)::QAR1(A),XB(i)
    • S(b);N_PINP(F)::P=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • B(i);CHECK,OGATE,P_SPINB(i),XP(F)::QAR1(A),XB(i)
        • K(f);S_FLIGHT::PXB(i)=Q
        • Q(g);N_GUARD::PXB(i)=Q
        • S(b);N_PINP(F)::P=Q
      • Refutation
        • B(h);
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);N_GUARD,S_FLIGHT::PXB(i)=Q
      • Refutation
        • K(f);S_FLIGHT,XQ(A)
    • Try
      • P(F);CHECK,N_SPINP(F),XB(i)
      • Refutation
        • Q(g);XR(G)
  • Actual
    • P(F);CHECK,N_SPINP(F),XB(i)
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