MESON Chess Problem Database

Problem Display
PID: 269466 (K7/4N1p1/4R1p1/p3n1P1/Rn3kbQ/3p4/3P4/7B w - - 0 1)

Brown, Carl G

The Observer, 1958

(First published on Sun Mar 23 1958)

K7/4N1p1/4R1p1/p3n1P1/Rn3kbQ/3p4/3P4/7B

#2

8 + 8

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Re4#
    • 1...Sc6
      • 2.Re4#
    • 1...Sd7
      • 2.Re4#
    • 1...Sf7
      • 2.Re4#
  • Tries
    • 1.Kb7?
      • 1...Sc4
        • 2.Re4#
      • 1...Sc6
        • 2.Re4#
      • 1...Sd7
        • 2.Re4#
      • 1...Sf7
        • 2.Re4#
      • 1...Sf3!
    • 1.Bg2?
      • 1...Sc4
        • 2.Re4#
      • 1...Sc6
        • 2.Re4#
      • 1...Sd7
        • 2.Re4#
      • 1...Sf7
        • 2.Re4#
      • 1...Sf3!
    • 1.Rxb4+?
      • 1...Sc4
        • 2.Rxc4#
        • 2.Re4#
      • 1...axb4!
  • Keys
    • 1.Be4!
      • 1...Kxe4
        • 2.Qxg4#
      • 1...Sf3
        • 2.Sxg6#
      • 1...Sa2
        • 2.Sd5#
      • 1...Sc2
        • 2.Sd5#
      • 1...Sd5
        • 2.Sxd5#
      • 1...Sa6
        • 2.Sd5#
      • 1...Sbc6
        • 2.Sd5#
      • 1...Sc4
        • 2.Sxg6#
      • 1...Sec6
        • 2.Sxg6#
      • 1...Sd7
        • 2.Sxg6#
      • 1...Sf7
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(f);N_SPINS(b),OGATE::R1(F)
    • S(f);OGATE::R1(F)
  • Tries
    • Try
      • K(H);S_FLIGHT
      • Vars
        • S(f);N_SPINS(b),OGATE::R1(F)
        • S(f);OGATE::R1(F)
      • Refutation
        • S(f);
    • Try
      • B(A);
      • Vars
        • S(f);N_SPINS(b),OGATE::R1(F)
        • S(f);OGATE::R1(F)
      • Refutation
        • S(f);
    • Try
      • R(C);CHECK,XS(b)
      • Refutation
        • P(e);XR(C)
  • Actual
    • B(A);N_PINS(b)
    • Vars
      • K(c);N_GUARD,P-FLIGHT,P_SPINS(b),S_CUTS(f),XB(A)::QAR2(D),XB(d)
      • S(f);N_GUARD::S(G),XP(g)
      • S(b);N_GUARD::S(G)
      • S(b);N_GUARD::S(G),XS(b)
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