MESON Chess Problem Database

Problem Display
PID: 33169 (3b4/KQ2p2R/1p1rkp2/4B1P1/B2P1PP1/1N6/3p1rp1/8 w - - 0 1)

Ling, John Francis

The Observer, 1958

(First published on Sun Oct 5 1958)

3b4/KQ2p2R/1p1rkp2/4B1P1/B2P1PP1/1N6/3p1rp1/8

#2

10 + 9

136 Problem Observer 2001
17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.f5#
    • 1...Rxd4
      • 2.Sxd4#
    • 1...Rc6
      • 2.Qxc6#
    • 1...Rd7
      • 2.Bxd7#
      • 2.Qxd7#
    • 1...b5
      • 2.Sc5#
  • Tries
    • 1.Qc8+?
      • 1...Rd7+
        • 2.Qxd7#
      • 1...Kd5!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Bxf6#
      • 1...Rd7+
        • 2.Bc7#
      • 1...Rxf4
        • 2.Bxf4#
      • 1...Rxd4
        • 2.Sxd4#
      • 1...fxe5
        • 2.Qxe5#
      • 1...fxg5
        • 2.Bh8#
      • 1...Rc6
        • 2.Qxc6#
      • 1...b5
        • 2.Sc5#
      • 1...Re2
        • 2.f5#
      • 1...Rd5
        • 2.Qf5#
      • 1...f5
        • 2.gxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::P(D)
    • R(e);XP(C)::S(A),XR(e)
    • R(e);OGATEB::QAR2(I),XR(e)
    • P(d);N_GUARD::S(A)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • R(e);CHECK,N_GUARD,P_SPINR(e)::QAB1(I),XR(e)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAR(I)+B(F),XP(g)
    • Vars
      • R(e);CHECK,OGATE::QAR(I)+B(F)
      • R(b);OGATE,XP(D)::QAR(I)+B(F),XR(b)
      • R(e);XP(C)::S(A),XR(e)
      • P(g);OGATE,P_SPINP(g),XB(F)::QAR1(I),XP(g)
      • P(g);OGATE,XP(G)::QAR(I)+B(F)
      • R(e);OGATEB::QAR2(I),XR(e)
      • P(d);N_GUARD::S(A)
      • R(b);N_GUARD::P(D)
      • R(e);SBLOCK::QAB1(I)
      • P(g);OGATE::P(E),XP(g)
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