MESON Chess Problem Database

Problem Display
PID: 78397 (B7/8/8/8/1QK5/8/6qp/6bk w - - 0 1)

Lipton, Michael

The Tablet, 1959

(First published on Sat Feb 7 1959)

B7/8/8/8/1QK5/8/6qp/6bk

#2

3 + 4

15239 Valois Notebooks 2017
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Bxf3#
    • 1...Qe4+
      • 2.Bxe4#
    • 1...Qd5+
      • 2.Bxd5#
    • 1...Qc6+
      • 2.Bxc6#
    • 1...Qb7
      • 2.Bxb7#
      • 2.Qxb7#
  • Tries
    • 1.Qe1?
      • 1...Qe4+
        • 2.Bxe4#
        • 2.Qxe4#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Qc6+
        • 2.Bxc6#
      • 1...Qf3
        • 2.Bxf3#
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxa8!
    • 1.Qb1?
      • 1...Qe4+
        • 2.Bxe4#
        • 2.Qxe4#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Qc6+
        • 2.Bxc6#
      • 1...Qf3
        • 2.Bxf3#
      • 1...Qb7
        • 2.Bxb7#
        • 2.Qxb7#
      • 1...Qxa8!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qxg2#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...Qd5+
        • 2.Qxd5#
      • 1...Qc6+
        • 2.Qxc6#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...Qf3
        • 2.Qxf3#

This anticipates 117200(1990)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATEB::B(C),XQ(c)
    • Q(c);CHECK,OGATEB::B(C),XQ(c)
  • Tries
    • Try
      • Q(A);P_PINB(a)
      • Vars
        • Q(c);CHECK,OGATEB::B(C),XQ(c)
        • Q(c);OGATEB::B(C),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XB(C)
    • Try
      • Q(A);P_PINB(a)
      • Vars
        • Q(c);CHECK,OGATEB::B(C),XQ(c)
        • Q(c);OGATEB::B(C),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XB(C)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XQ(c)
    • Vars
      • Q(c);CHECK,OGATEB::QAB(A),XQ(c)
      • Q(c);OGATE,XQ(A)::B(C),XQ(c)
      • Q(c);OGATEB::QAB(A),XQ(c)
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