MESON Chess Problem Database

Problem Display
PID: 23186 (r3k1n1/p7/4K3/8/8/8/1Q6/8 w q - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

r3k1n1/p7/4K3/8/8/8/1Q6/8

#2

2 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qxb8#
  • Tries
    • 1.Qg7?
      • threat
        • 2.Qxg8#
      • 1...Kd8
        • 2.Qd7#
      • 1...Sf6
        • 2.Qe7#
      • 1...Sh6
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...0-0-0!
    • 1.Qb5+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxa8#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Rb8
        • 2.Qxb8#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Rd8
        • 2.Qf7#
      • 1...Se7
        • 2.Qxe7#

Anticipated by 70625(1951), 79109(1962)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::QAR(A),XR(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR2(A),XS(d)
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
        • S(d);N_GUARD::QAR1(A)
        • S(d);N_GUARD::QAR1(A),XS(d)
      • Refutation
        • K(c);0-0-0
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR(A),XR(b)
    • Vars
      • K(c);P-FLIGHT::QAR1(A)
      • R(b);N_GUARD::QAR(A),XR(b)
      • R(b);N_GUARD::QAR2(A),XR(b)
      • R(b);SBLOCK::QAB1(A)
      • S(d);N_GUARD::QAR1(A),XS(d)
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