MESON Chess Problem Database

Problem Display
PID: 63137 (8/4Pk1K/R3rp2/8/8/6Q1/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2005

8/4Pk1K/R3rp2/8/8/6Q1/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe7
      • 2.Qg8#
  • Tries
    • 1.Ra7?
      • threat
        • 2.Qg6#
        • 2.Qg8#
      • 1...Ke8
        • 2.Qg6#
        • 2.Qg8#
      • 1...Rxe7
        • 2.Qg8#
      • 1...Re1
        • 2.Qg8#
      • 1...Re2
        • 2.Qg8#
      • 1...Re3
        • 2.Qg8#
      • 1...Re4
        • 2.Qg8#
      • 1...Re5
        • 2.Qg8#
      • 1...Ra6
        • 2.Qg8#
      • 1...Rb6
        • 2.Qg8#
      • 1...Rc6
        • 2.Qg8#
      • 1...Rd6
        • 2.Qg8#
      • 1...f5!
    • 1.e8Q+?
      • 1...Rxe8
        • 2.Qg7#
      • 1...Kxe8!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qf8#
      • 1...Kxe7
        • 2.Ra7#
      • 1...Rxa6
        • 2.e8Q#
      • 1...Rxe7
        • 2.Qg8#
      • 1...Rb6
        • 2.e8Q#
      • 1...Rc6
        • 2.e8Q#
      • 1...Rd6
        • 2.e8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK,XP(C)::QAB1(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);P_SPINR(a),XP(C)::QAB1(A)
        • R(a);::QAB1(A)
      • Refutation
        • P(b);
    • Try
      • P(C);CHECK
      • Vars
        • R(a);SBLOCK,XQ(C)::QAR1(A)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(C)::R(B)
      • R(a);N_GUARD,XR(B)::P=Q
      • R(a);SBLOCK,XP(C)::QAB1(A)
      • R(a);N_GUARD::P=Q
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