MESON Chess Problem Database

Problem Display
PID: 156153 (1K2nB2/3p4/2RnN3/P2k4/3P2P1/8/2Q5/8 w - - 0 1)

Sheldon, Alfred King

Hampstead and Highgate Express, 1916

(First published on Sat Jan 8 1916)

1K2nB2/3p4/2RnN3/P2k4/3P2P1/8/2Q5/8

#2

8 + 4

15351 SCPF/BCPS Black Books 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.Qf5#
    • 1...Sc4
      • 2.Qg2#
    • 1...Se4
      • 2.Qc4#
    • 1...Sb5
      • 2.Qg2#
    • 1...Sf5
      • 2.Qg2#
    • 1...Sb7
      • 2.Qg2#
    • 1...Sf7
      • 2.Qg2#
    • 1...Sc8
      • 2.Qg2#
    • 1...Sf6
      • 2.Rxd6#
    • 1...Sc7
      • 2.Rxd6#
    • 1...Sg7
      • 2.Rxd6#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Qc5#
      • 1...Sc4
        • 2.Qe4#
        • 2.Qxc4#
      • 1...Se4
        • 2.Qxe4#
        • 2.Qc4#
      • 1...Sb7
        • 2.Qe4#
        • 2.Qc4#
      • 1...Kxd4!
    • 1.Sc7+?
      • 1...Sxc7
        • 2.Rxd6#
      • 1...Kxd4!
    • 1.Qb3+?
      • 1...Kxc6
        • 2.Sd8#
        • 2.d5#
      • 1...Sc4
        • 2.Qf3#
      • 1...Ke4!
    • 1.Qf5+?
      • 1...Kxc6
        • 2.Sd8#
        • 2.Qc5#
      • 1...Sxf5!
    • 1.Qc5+?
      • 1...Kxe6
        • 2.Qf5#
      • 1...Ke4!
  • Keys
    • 1.Qd3!
      • 1...Kxc6
        • 2.d5#
      • 1...Kxe6
        • 2.Qf5#
      • 1...dxc6
        • 2.Sf4#
      • 1...dxe6
        • 2.Rc5#
      • 1...Sb5
        • 2.Qf3#
      • 1...Sc4
        • 2.Qf3#
      • 1...Se4
        • 2.Qc4#
      • 1...Sf5
        • 2.Qf3#
      • 1...Sb7
        • 2.Qf3#
      • 1...Sf7
        • 2.Qf3#
      • 1...Sc8
        • 2.Qf3#
      • 1...Sf6
        • 2.Rxd6#
      • 1...Sc7
        • 2.Rxd6#
      • 1...Sg7
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 6
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB1(A)
    • S(b);N_GUARD::QAB(A)
    • S(b);N_GUARD,SBLOCK::QAB1(A)
    • S(d);N_GUARD::R1(E),XS(b)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAR1(A)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • S(F);CHECK
      • Vars
        • S(d);XS(F)::R1(E),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,P_SPINS(b),S_FLIGHT,XS(F)::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);OGATE,S_FLIGHT,XR(E)::P(B)
      • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB1(A)
      • P(c);SBLOCK,XR(E)::S(F)
      • P(c);SBLOCK,XS(F)::R1(E)
      • S(b);N_GUARD::QAB(A)
      • S(b);N_GUARD,SBLOCK::QAB1(A)
      • S(d);N_GUARD::R1(E),XS(b)
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