MESON Chess Problem Database

Problem Display
PID: 153858 (KR2N2b/4k3/1B6/1B2pQ2/4n3/2pr4/8/8 w - - 0 1)

Harley, Brian

The Observer, 1950

(First published on Sun Jan 29 1950)

KR2N2b/4k3/1B6/1B2pQ2/4n3/2pr4/8/8

#2

6 + 6

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Bd8#
      • 2.Rb7#
    • 1...Rf3
      • 2.Bd8#
      • 2.Rb7#
    • 1...Rg3
      • 2.Bd8#
      • 2.Rb7#
    • 1...Rh3
      • 2.Bd8#
      • 2.Rb7#
    • 1...Rd8
      • 2.Bxd8#
    • 1...Sd6
      • 2.Bd8#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Qe6#
        • 2.Qf8#
      • 1...Kd6
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qf8#
      • 1...Bf6
        • 2.Qe6#
      • 1...Sf6
        • 2.Qe6#
      • 1...Rf3
        • 2.Qe6#
      • 1...Rd6
        • 2.Re8#
        • 2.Qf8#
      • 1...Bg7
        • 2.Qe6#
      • 1...Sc5
        • 2.Qf8#
      • 1...Sg5
        • 2.Qf8#
      • 1...Rd8!
    • 1.Qd7+?
      • 1...Kf8
        • 2.Sd6#
        • 2.Sf6#
        • 2.Sc7#
        • 2.Sg7#
      • 1...Rxd7!
    • 1.Qf8+?
      • 1...Ke6
        • 2.Sc7#
      • 1...Kxf8!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Sc8#
      • 1...Kxd6
        • 2.Qd7#
      • 1...Rxd6
        • 2.Re8#
      • 1...Sxd6
        • 2.Bd8#
      • 1...Bf6
        • 2.Qd7#
      • 1...Sf6
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD,P_PINR(E)::B(C),XR(b)
    • S(c);S_CUTR(b)::B(C)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);::QAR1(B)
        • S(c);::QAR1(B)
        • R(b);::QAR1(B)
        • S(c);::QAB1(B)
      • Refutation
        • R(b);P_PINR(E)
    • Try
      • Q(B);CHECK
      • Refutation
        • R(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);P-FLIGHT::S(F)
      • Refutation
        • K(e);S_FLIGHT,XQ(B)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • K(e);S_FLIGHT,XS(F)::QAR1(B)
      • R(b);SBLOCK,XS(F)::R1(E)
      • S(c);SBLOCK,XS(F)::B(C)
      • B(f);SBLOCK::QAR1(B)
      • S(c);S_CUTB(f)::QAR2(B),XP(d)
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