MESON Chess Problem Database

Problem Display
PID: 74863 (N1n1k3/N7/4K3/8/1Q6/6n1/8/8 w - - 0 1)

Lincoln, Robert A

Problem Observer, 2007

N1n1k3/N7/4K3/8/1Q6/6n1/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Qf8#
    • 1...Sb6
      • 2.Qe7#
    • 1...Sxa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Sc7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sd6!
    • 1.Sxc8?
      • threat
        • 2.Qe7#
      • 1...Kd8
        • 2.Qf8#
      • 1...Sf5!
    • 1.Qc3?
      • threat
        • 2.Qh8#
        • 2.Qxc8#
      • 1...Kd8
        • 2.Qh8#
        • 2.Qxc8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Sxa7
        • 2.Qh8#
      • 1...Sb6
        • 2.Qh8#
      • 1...Sd6
        • 2.Qh8#
      • 1...Se7!
    • 1.Qc5?
      • threat
        • 2.Qxc8#
      • 1...Kd8
        • 2.Qf8#
        • 2.Qxc8#
      • 1...Sxa7
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sb6
        • 2.Qe7#
      • 1...Sd6!
    • 1.Qd6?
      • threat
        • 2.Sc7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sxd6!
    • 1.Qb2?
      • threat
        • 2.Qh8#
      • 1...Kd8
        • 2.Qh8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Se7!
    • 1.Qa4+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 1.Qd4?
      • threat
        • 2.Qh8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Se7!
    • 1.Qh4?
      • threat
        • 2.Qh8#
      • 1...Kf8
        • 2.Qh8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sh5!
    • 1.Qb5+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 1.Qb8?
      • threat
        • 2.Qxc8#
      • 1...Kd8
        • 2.Qxc8#
      • 1...Kf8!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxc8#
      • 1...Kd8
        • 2.Qxc8#
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Sxa7
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sb6
        • 2.Qe7#
      • 1...Sd6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::QAR2(A)
    • S(b);N_GUARD::QAR1(A)
    • S(b);N_GUARD,XS(C)::QAR1(A)
    • S(b);N_GUARD::QAR1(A),XS(b)
  • Tries
    • Try
      • S(C);
      • Threat
        • S(D)
      • Vars
        • S(b);N_GUARD::QAR1(A),XS(b)
      • Refutation
        • S(b);
    • Try
      • S(C);XS(b)
      • Threat
        • QAR1(A)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
        • S(b);XS(C)::QAR(A)
        • S(b);::QAR(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAR2(A),XS(b)
      • Vars
        • S(b);N_GUARD,XS(C)::QAR1(A)
        • S(b);N_GUARD::QAR1(A),XS(b)
        • S(b);N_GUARD::QAR1(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • S(D)
      • Vars
        • S(b);N_GUARD::QAR1(A),XS(b)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(c);P-FLIGHT::QAR(A)
        • K(c);P-FLIGHT::QAR2(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(c);P-FLIGHT::QAR2(A)
        • S(b);N_GUARD::QAR1(A),XS(b)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);P_PINS(b)
      • Threat
        • QAR2(A),XS(b)
      • Vars
        • K(c);P-FLIGHT::QAR1(A),XS(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A),XS(b)
    • Vars
      • K(c);P-FLIGHT::QAR1(A)
      • S(b);N_GUARD,XS(C)::QAR1(A)
      • S(b);N_GUARD::QAR1(A),XS(b)
      • S(b);N_GUARD::QAR1(A)
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