MESON Chess Problem Database

Problem Display
PID: 147040 (q1R2K2/1PB5/2Q3p1/5kp1/p5p1/2n5/8/8 w - - 0 1)

Lincoln, Robert A

Australian Chess Problem Magazine, 1995

q1R2K2/1PB5/2Q3p1/5kp1/p5p1/2n5/8/8

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc8+
      • 2.bxc8Q#
      • 2.bxc8B#
  • Tries
    • 1.Kf7?
      • threat
        • 2.Qe6#
        • 2.Qxg6#
      • 1...Qxc8
        • 2.Qxg6#
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...g3
        • 2.Qf3#
        • 2.Qe6#
      • 1...Qa6!
    • 1.Kg7?
      • threat
        • 2.Qxg6#
      • 1...Qa6
        • 2.Rf8#
      • 1...g3!
    • 1.Qf3+?
      • 1...Ke6
        • 2.Qf7#
      • 1...gxf3!
    • 1.Qd5+?
      • 1...Kf6
        • 2.Bd8#
        • 2.Qf7#
        • 2.Qe5#
      • 1...Sxd5!
    • 1.Qd7+?
      • 1...Kf6
        • 2.Qf7#
      • 1...Ke4!
  • Keys
    • 1.Ke7!
      • threat
        • 2.Qe6#
      • 1...Sd5+
        • 2.Qxd5#
      • 1...Qxc8
        • 2.bxc8Q#
        • 2.bxc8B#
      • 1...Qa6
        • 2.Rf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);CHECK,OGATE,XR(D)::PXQ(g)=Q
  • Tries
    • Try
      • K(E);N_SPINR(D),P-FLIGHT
      • Threat
        • DUALS(2)
      • Refutation
        • Q(g);
    • Try
      • K(E);N_SPINR(D),S_FLIGHT
      • Threat
        • QAB1(A),XP(f)
      • Vars
        • Q(g);N_GUARD::R(D)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • K(E);N_SPINR(D),S_FLIGHT
    • Threat
      • QAB1(A)
    • Vars
      • S(a);CHECK,N_GUARD::QAR2(A),XS(a)
      • Q(g);OGATE,XR(D)::PXQ(g)=Q
      • Q(g);N_GUARD::R(D)
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