MESON Chess Problem Database

Problem Display
PID: 8169 (3Q4/2RP4/4k1b1/5p2/3K4/8/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 1995

3Q4/2RP4/4k1b1/5p2/3K4/8/8/8

#2

4 + 3

2786 More Fun with Chess Miniatures 2000
145 StrateGems 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Bf7
      • 2.Rc6#
    • 1...Be8
      • 2.dxe8Q#
      • 2.dxe8R#
  • Tries
    • 1.Qe8+?
      • 1...Kd6
        • 2.Qe5#
        • 2.d8Q#
      • 1...Kf6
        • 2.d8Q#
        • 2.d8B#
      • 1...Bxe8!
    • 1.Qg8+?
      • 1...Kd6
        • 2.d8Q#
      • 1...Kf6
        • 2.d8Q#
        • 2.d8B#
      • 1...Ke7
        • 2.d8Q#
      • 1...Bf7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.d8Q#
      • 1...Kd6
        • 2.d8Q#
        • 2.d8R#
      • 1...Kf6
        • 2.d8Q#
        • 2.d8B#
      • 1...Ke7
        • 2.d8Q#
      • 1...Kf7
        • 2.d8Q#
      • 1...Be8
        • 2.dxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(c);SBLOCK::R(B)
    • B(c);OGATE::PXB(c)=Q
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::P=Q
      • Refutation
        • B(c);XQ(D)
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::P=Q
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • Q(D);
    • Threat
      • P=Q
    • Vars
      • K(b);P-FLIGHT::P=Q
      • K(b);S_FLIGHT::P=Q
      • B(c);OGATE::PXB(c)=S
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