MESON Chess Problem Database

Problem Display
PID: 15624 (5K2/3p1pp1/4k3/1QR5/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Newark Star-Ledger, 1986

5K2/3p1pp1/4k3/1QR5/8/8/8/8

#2

3 + 4

2838 Fun with Chess Miniatures 1996
3713 Snap 2011
145 StrateGems 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qb6#
  • Tries
    • 1.Re5+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6!
    • 1.Rf5?
      • threat
        • 2.Qd5#
        • 2.Qe5#
      • 1...Kd6
        • 2.Qb6#
      • 1...d5
        • 2.Qxd5#
      • 1...f6
        • 2.Qd5#
      • 1...d6!
    • 1.Qe2+?
      • 1...Kd6
        • 2.Qe5#
        • 2.Qe7#
      • 1...Kf6!
    • 1.Qc4+?
      • 1...Kd6
        • 2.Qd5#
      • 1...Kf6
        • 2.Qxf7#
      • 1...d5!
    • 1.Qxd7+?
      • 1...Kf6
        • 2.Qf5#
        • 2.Qc6#
        • 2.Qd6#
        • 2.Qxf7#
      • 1...Kxd7!
    • 1.Qb3+?
      • 1...Kd6
        • 2.Qd5#
        • 2.Qb6#
      • 1...Kf6
        • 2.Qxf7#
      • 1...d5!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Qe5#
      • 1...Kd6
        • 2.Qb6#
      • 1...Kf6
        • 2.Qe5#
        • 2.Qf5#
      • 1...d6
        • 2.Qf5#
      • 1...d5
        • 2.Qc6#
      • 1...f5
        • 2.Rg6#
      • 1...f6
        • 2.Qd5#

Anticipated by 141839(1954)

FEATURES

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