MESON Chess Problem Database

Problem Display
PID: 166344 (k5r1/4n3/K2B4/1Q6/8/8/8/7b w - - 0 1)

Lincoln, Robert A

StrateGems, 2016

k5r1/4n3/K2B4/1Q6/8/8/8/7b

#2

3 + 4

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qb8#
    • 1...Rg2
      • 2.Qb7#
      • 2.Qb8#
    • 1...Rg3
      • 2.Qb8#
    • 1...Rg4
      • 2.Qb8#
    • 1...Rg5
      • 2.Qb8#
    • 1...Rg6
      • 2.Qb8#
    • 1...Rg7
      • 2.Qb8#
    • 1...Rb8
      • 2.Qxb8#
    • 1...Bb7+
      • 2.Qxb7#
    • 1...Sd5
      • 2.Qc6#
      • 2.Qb7#
    • 1...Sc6
      • 2.Qb7#
    • 1...Sc8
      • 2.Qb8#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Qa7#
      • 1...Bb7+
        • 2.Qxb7#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sc8!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qa7#
      • 1...Bb7+
        • 2.Qxb7#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sc8
        • 2.Qb8#

Anticipated by 264491(1992)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • R(d);N_GUARD::QAR1(A)
    • R(d);N_GUARD,P_PINB(C)::QAR1(A)
    • R(d);N_GUARD::QAR1(A),XR(d)
    • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
    • S(b);S_CUTB(a)::QAB1(A)
    • S(b);S_CUTR(d)::QAR1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
        • S(b);S_CUTB(a)::QAB1(A)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
      • S(b);S_CUTB(a)::QAB1(A)
      • S(b);S_CUTR(d)::QAR1(A)
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Developed and maintained by Brian Stephenson.
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