MESON Chess Problem Database

Problem Display
PID: 199468 (4R3/1B6/1n5n/3rP1RK/4k3/2Q2N1N/q1p3P1/3b2b1 w - - 0 1)

Dale, John

The Observer, 1945

(First published on Sun Jul 8 1945)

4R3/1B6/1n5n/3rP1RK/4k3/2Q2N1N/q1p3P1/3b2b1

#2

9 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf3+
      • 2.gxf3#
    • 1...Bh2
      • 2.Qd4#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Sg4
      • 2.Sd2#
    • 1...Sf5
      • 2.Rg4#
  • Tries
    • 1.Sf2+?
      • 1...Kf4
        • 2.g3#
      • 1...Bxf2!
    • 1.Rg4+?
      • 1...Kf5
        • 2.Sh4#
        • 2.Rf4#
      • 1...Sxg4!
  • Keys
    • 1.e6!
      • threat
        • 2.Re5#
      • 1...Bxf3+
        • 2.gxf3#
      • 1...Bh2
        • 2.Qd4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sc4
        • 2.Bxd5#
      • 1...Sd7
        • 2.exd7#
      • 1...Sg4
        • 2.Sd2#
      • 1...Sf5
        • 2.Rg4#
      • 1...Sf7
        • 2.exf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);CHECK,OGATE,XS(C)::P(A),XB(a)
    • B(b);N_GUARD::QAR1(B)
    • B(b);N_GUARD::QAR1(B),XB(b)
    • S(h);N_PINS(C)::S(C)
    • S(h);N_GUARD,SBLOCK::R(F)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(e);N_SPINR(f),P-FLIGHT::P(A)
      • Refutation
        • B(b);XS(D)
    • Try
      • R(F);CHECK,N_SPINS(C),P_SPINP(E)
      • Refutation
        • S(h);XR(F)
  • Actual
    • P(E);P_SPINR(F)
    • Threat
      • R1(F)
    • Vars
      • B(a);CHECK,OGATE,XS(C)::P(A),XB(a)
      • B(b);N_GUARD::QAR1(B)
      • B(b);N_GUARD::QAR1(B),XB(b)
      • S(g);N_GUARD,S_CUTQ(c)::B(H),XR(f)
      • S(g);OGATE::R(I)+P(E),XS(g)
      • S(h);N_PINS(C)::S(C)
      • S(h);N_PINR(F),SBLOCK::R(F)
      • S(h);OGATE::R(I)+P(E),XS(h)
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