MESON Chess Problem Database

Problem Display
PID: 134111 (3R4/4pk1K/5P2/7R/5Q2/8/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 2009

3R4/4pk1K/5P2/7R/5Q2/8/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Re5?
      • threat
        • 2.Rxe7#
        • 2.fxe7#
      • 1...exf6
        • 2.Qc4#
      • 1...e6!
    • 1.Qe5?
      • threat
        • 2.Qxe7#
      • 1...exf6
        • 2.Qe8#
      • 1...e6!
    • 1.Qd6?
      • threat
        • 2.Qxe7#
      • 1...exf6
        • 2.Rf8#
        • 2.Qd7#
      • 1...e6
        • 2.Rf8#
        • 2.Qe7#
        • 2.Qf8#
      • 1...e5
        • 2.Rf8#
        • 2.Qe7#
      • 1...exd6!
    • 1.Qc7?
      • threat
        • 2.Qxe7#
      • 1...Ke6
        • 2.Qxe7#
      • 1...Kxf6!
    • 1.Qc4+?
      • 1...Kxf6
        • 2.Rf8#
      • 1...e6!
    • 1.Qe4?
      • threat
        • 2.Qxe7#
      • 1...Kxf6
        • 2.Rf5#
        • 2.Rf8#
        • 2.Qf5#
        • 2.Qg6#
      • 1...exf6
        • 2.Qe8#
      • 1...e6
        • 2.Qg6#
      • 1...e5!
    • 1.Qg4?
      • 1...Kxf6
        • 2.Rf8#
        • 2.Qf5#
        • 2.Qg6#
      • 1...exf6
        • 2.Qd7#
      • 1...e6
        • 2.Qg6#
        • 2.Qg7#
      • 1...e5!
    • 1.Qf5?
      • 1...exf6
        • 2.Qd7#
      • 1...e6
        • 2.Qg6#
      • 1...e5!
    • 1.fxe7+?
      • 1...Ke6
        • 2.Re5#
        • 2.e8Q#
        • 2.e8R#
      • 1...Kxe7!
  • Keys
    • 1.Rh6!
      • 1...Ke6
        • 2.f7#
      • 1...exf6
        • 2.Qxf6#
      • 1...e5
        • 2.Qc4#
      • 1...e6
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);N_GUARD,P_SPINP(a),SBLOCK,XP(C)::QAB(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(a)
      • Vars
        • P(a);OGATE,SBLOCK,XP(C)::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(a)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAR1(A),XP(a)
      • Vars
        • K(b);N_SPINP(a),S_FLIGHT::QAR1(A),XP(a)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,XP(C)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(C)::R(E)
      • Refutation
        • P(a);P_SPINP(a)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(a)
      • Vars
        • P(a);OGATE,SBLOCK,XP(C)::QAB1(A)
        • P(a);SBLOCK::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • P(a);OGATEB,SBLOCK,XP(C)::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Vars
        • P(a);OGATEB,P_SPINP(a),SBLOCK,XP(C)::QAR2(A)
        • P(a);SBLOCK::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • P(C);CHECK,XP(a)
      • Refutation
        • K(b);P-FLIGHT,XP(C)
  • Actual
    • R(B);
    • Vars
      • K(b);OGATE,S_FLIGHT::R(B)+P(C)
      • P(a);OGATE,P_SPINP(a),XP(C)::QAR1(A),XP(a)
      • P(a);N_GUARD::QAB(A)
      • P(a);OGATEB,SBLOCK::QAR(A)
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