MESON Chess Problem Database

Problem Display
PID: 269838 (1K5b/8/4n1Bp/1p3R2/1r2RNk1/3N4/2Q1n1P1/3bB3 w - - 0 1)

Eddy, Edwin John

The Observer, 1958

(First published on Sun Aug 3 1958)

1K5b/8/4n1Bp/1p3R2/1r2RNk1/3N4/2Q1n1P1/3bB3

#2

9 + 8

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Be5+
      • 2.Sxe5#
    • 1...S2d4
      • 2.Sxe6#
    • 1...S2xf4
      • 2.Qxd1#
    • 1...S6d4
      • 2.Sxe2#
    • 1...Sg7
      • 2.Se5#
  • Tries
    • 1.Sd5+?
      • 1...S2f4
        • 2.Se3#
        • 2.Qxd1#
      • 1...S6f4
        • 2.Se3#
      • 1...Rxe4!
    • 1.Sxe6+?
      • 1...Sf4
        • 2.Rfxf4#
        • 2.Qxd1#
      • 1...Rxe4!
  • Keys
    • 1.Rh5!
      • threat
        • 2.Bf5#
      • 1...Be5+
        • 2.Sxe5#
      • 1...S2xf4
        • 2.Qxd1#
      • 1...S6xf4
        • 2.Qc8#
      • 1...Sg3
        • 2.Sf2#
      • 1...S2d4
        • 2.Sxe6#
      • 1...S6d4
        • 2.Sxe2#
      • 1...Sg5
        • 2.Rh4#
      • 1...Sg7
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(h);CHECK,N_GUARD::S(D),XB(h)
    • S(b);N_GUARD,S_CUTR(c)::R(E)+S(F),XS(f)
    • S(b);OGATEB,P_SPINS(b),XS(F)::QAB(B),XB(a)
    • S(f);N_GUARD,S_CUTR(c)::R(E)+S(F),XS(b)
    • S(f);S_CUTB(h)::S(D)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • S(f);P_SPINS(f)::S(F)
      • Refutation
        • R(c);XR(E)
    • Try
      • S(F);CHECK,XS(f)
      • Refutation
        • R(c);XR(E)
  • Actual
    • R(G);
    • Threat
      • B(H)
    • Vars
      • B(h);CHECK,N_GUARD::S(D),XB(h)
      • S(b);OGATEB,P_SPINS(b),XS(F)::QAB(B),XB(a)
      • S(f);OGATEB,P_SPINS(f),XS(F)::QAB(B)
      • S(b);SBLOCK::S(D)
      • S(b);N_GUARD,S_CUTR(c)::R(E)+S(F),XS(f)
      • S(f);N_GUARD,S_CUTR(c)::R(E)+S(F),XS(b)
      • S(f);SBLOCK::R1(G)
      • S(f);S_CUTB(h)::S(D)
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