MESON Chess Problem Database

Problem Display
PID: 152173 (1K1Nn3/4B1n1/8/4k3/8/2N5/5Q1b/8 w - - 0 1)

McAllister, George W

1st Prize, Good Companions (November), 1913

1K1Nn3/4B1n1/8/4k3/8/2N5/5Q1b/8

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Qc5#
    • 1...Se6
      • 2.Sc6#
      • 2.Sf7#
    • 1...Sd6
      • 2.Bf6#
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sc7
      • 2.Qf6#
  • Tries
    • 1.Bf6+?
      • 1...Kd6
        • 2.Qd4#
      • 1...Sxf6!
    • 1.Qf3?
      • threat
        • 2.Qe4#
      • 1...Sd6
        • 2.Bf6#
        • 2.Qf6#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Kd4+!
  • Keys
    • 1.Bg5!
      • threat
        • 2.Qc5#
      • 1...Kd6
        • 2.Qd4#
      • 1...Bg1
        • 2.Qf4#
      • 1...Se6
        • 2.Sf7#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sc7
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);SBLOCK::QAR2(A)
    • S(d);N_GUARD::QAB1(A),XS(d)
    • S(d);N_GUARD::QAB1(A)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • S(d);XB(C)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(d);N_GUARD::QAB1(A),XS(d)
      • Refutation
        • K(b);CHECK,S_FLIGHT
  • Actual
    • B(C);
    • Threat
      • QAR2(A)
    • Vars
      • K(b);S_FLIGHT::QAR2(A)
      • B(a);N_GUARD::QAB1(A)
      • S(c);SBLOCK::S(E)
      • S(d);N_GUARD::QAB1(A),XS(d)
      • S(d);N_GUARD::QAB1(A)
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