MESON Chess Problem Database

Problem Display
PID: 70625 (r3k1n1/p7/4K3/8/1Q6/8/8/8 w q - 0 1)

Lipton, Michael

Chess, 1951

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

#2

2 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qxb8#
    • 1...Sf6
      • 2.Qe7#
    • 1...Sh6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Qa4+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 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#

This anticipates 79109(1962), 23186(1996)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::QAR(A),XR(b)
    • S(d);N_GUARD::QAR1(A)
    • S(d);N_GUARD::QAR1(A),XS(d)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT
    • 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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