MESON Chess Problem Database

Problem Display
PID: 269194 (1bRR4/p2p3P/B1pN4/N3n3/1P6/QPk3K1/2pp1Bb1/2rr4 w - - 0 1)

White, JFL

1st Comm., The Observer, 1957

(First published on Sun Dec 8 1957)

1bRR4/p2p3P/B1pN4/N3n3/1P6/QPk3K1/2pp1Bb1/2rr4

#2

11 + 11

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Se4#
    • 1...Bh3
      • 2.Se4#
    • 1...Be4
      • 2.Sxe4#
    • 1...Sc4
      • 2.bxc4#
  • Tries
    • 1.Qa1+?
      • 1...Kxb4
        • 2.Rxb8#
      • 1...Rxa1!
  • Keys
    • 1.Sxc6!
      • threat
        • 2.Bd4#
      • 1...Bxc6
        • 2.Se4#
      • 1...Sxc6
        • 2.h8Q#
        • 2.h8B#
      • 1...dxc6
        • 2.Sb5#
      • 1...Sc4
        • 2.bxc4#
      • 1...Sf3
        • 2.Sxb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • B(e);N_GUARD::S(H)
    • B(e);N_GUARD::S(H),XB(e)
    • S(g);N_SPINP(h),OGATE,P_PINS(H)::QAR(B)+P(C),XS(g)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);N_SPINP(h),S_CUTR(a),S_FLIGHT,XP(E)::R(J),XB(k)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • S(F);XP(h)
    • Threat
      • B(A)
    • Vars
      • B(e);N_GUARD,P_SPINB(e),XS(F)::S(H)
      • S(g);P_PINS(H),P_SPINS(g),XS(F)::P=Q
      • P(j);P_SPINP(j),XS(F)::S(H)
      • S(g);OGATE,P_PINS(H)::QAR(B)+P(C),XS(g)
      • S(g);N_GUARD,P_PINS(H),S_CUTB(e)::R(J)+S(F),XB(k)
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