MESON Chess Problem Database

Problem Display
PID: 247861 (4K3/8/4k3/8/2NbB1p1/8/8/4Q3 w - - 0 1)

Lincoln, Robert A

Uralski Problemist, 2006

4K3/8/4k3/8/2NbB1p1/8/8/4Q3

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qf5#
        • 2.Qf7#
      • 1...Bf6
        • 2.Qb6#
        • 2.Qf5#
      • 1...Bxf2!
    • 1.Qg3?
      • threat
        • 2.Qd6#
      • 1...Bc5
        • 2.Qe5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Kf6!
    • 1.Qb4?
      • threat
        • 2.Qd6#
        • 2.Qe7#
      • 1...Kf6
        • 2.Qe7#
      • 1...Be5
        • 2.Qe7#
      • 1...Bf6
        • 2.Qd6#
        • 2.Qb6#
      • 1...Bc5!
    • 1.Qf1?
      • threat
        • 2.Qf5#
        • 2.Qf7#
      • 1...Bf6
        • 2.Qf5#
      • 1...Bf2!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qe7#
      • 1...Bc5
        • 2.Qh6#
      • 1...Bf6
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);N_GUARD::QAR1(A)
        • B(a);N_GUARD::QAR1(A),XB(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);P-FLIGHT::QAB1(A)
        • B(a);::QAR1(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(A)
      • Refutation
        • B(a);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • B(a);N_GUARD::QAR(A)
      • B(a);SBLOCK::QAB(A),XP(b)
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