MESON Chess Problem Database

Problem Display
PID: 23170 (2bQ4/n2P4/4k3/5R2/6K1/8/8/8 w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

2bQ4/n2P4/4k3/5R2/6K1/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.dxc8Q#
    • 1...Bxd7
      • 2.Qf6#
    • 1...Sb5
      • 2.dxc8Q#
      • 2.dxc8B#
    • 1...Sc6
      • 2.dxc8Q#
      • 2.dxc8B#
  • Tries
    • 1.Qxc8?
      • 1...Kd6
        • 2.d8Q#
      • 1...Ke7
        • 2.d8Q#
      • 1...Sb5
        • 2.d8Q#
      • 1...Sc6
        • 2.d8Q#
      • 1...Sxc8!
    • 1.dxc8S?
      • threat
        • 2.Qe7#
        • 2.Qd5#
        • 2.Qd6#
        • 2.Qe8#
      • 1...Sb5
        • 2.Qe7#
        • 2.Qd5#
        • 2.Qe8#
      • 1...Sc6
        • 2.Qd5#
        • 2.Qd6#
      • 1...Sxc8!
  • Keys
    • 1.Qc7!
      • threat
        • 2.d8S#
      • 1...Ke7
        • 2.dxc8Q#
      • 1...Bxd7
        • 2.Qe5#
      • 1...Sc6
        • 2.dxc8Q#
        • 2.dxc8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::PXB(c)=Q
    • B(c);SBLOCK,XP(C)::QAR1(D)
    • S(b);N_GUARD::PXB(c)=Q
  • Tries
    • Try
      • Q(D);XB(c)
      • Vars
        • K(a);P-FLIGHT::P=Q
        • S(b);N_GUARD::P=Q
      • Refutation
        • S(b);XQ(D)
    • Try
      • P(C);XB(c)
      • Threat
        • DUALS(4)
      • Refutation
        • S(b);XS(C)
  • Actual
    • Q(D);
    • Threat
      • P=S
    • Vars
      • K(a);P-FLIGHT::PXB(c)=Q
      • B(c);SBLOCK,XP(C)::QAR1(D)
      • S(b);N_GUARD::PXB(c)=Q
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