MESON Chess Problem Database

Problem Display
PID: 78392 (R7/8/8/1K6/8/8/qp3Q2/kr6 w - - 0 1)

Lipton, Michael

The Tablet, 1959

(First published on Sat Jan 31 1959)

R7/8/8/1K6/8/8/qp3Q2/kr6

#2

3 + 4

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Rxa3#
    • 1...Qa4+
      • 2.Rxa4#
    • 1...Qa5+
      • 2.Rxa5#
    • 1...Qa6+
      • 2.Rxa6#
    • 1...Qa7
      • 2.Rxa7#
      • 2.Qxa7#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Rxa2#
        • 2.Qxa2#
      • 1...Qa4+
        • 2.Rxa4#
      • 1...Qa5+
        • 2.Rxa5#
      • 1...Qa6+
        • 2.Rxa6#
      • 1...Rc1
        • 2.Qxa2#
      • 1...Rd1
        • 2.Qxa2#
      • 1...Re1
        • 2.Qxa2#
      • 1...Rf1
        • 2.Qxa2#
      • 1...Rg1
        • 2.Qxa2#
      • 1...Rh1
        • 2.Qxa2#
      • 1...Qa3
        • 2.Rxa3#
      • 1...Qa7
        • 2.Rxa7#
        • 2.Qxa7#
      • 1...Qxa8!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qxa2#
      • 1...Qa4+
        • 2.Qxa4#
      • 1...Qa5+
        • 2.Qxa5#
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa7
        • 2.Rxa7#
      • 1...Qa3
        • 2.Qxa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(c);OGATEB::R(C),XQ(c)
    • Q(c);CHECK,OGATEB::R(C),XQ(c)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATEB::R(C),XQ(c)
        • R(b);::QAR1(A),XQ(c)
        • R(b);SBLOCK::QAR1(A),XQ(c)
        • Q(c);OGATEB::R(C),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XR(C)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XQ(c)
    • Vars
      • Q(c);CHECK,OGATEB::QAR(A),XQ(c)
      • Q(c);OGATE,XQ(A)::R(C),XQ(c)
      • Q(c);OGATEB::QAR2(A),XQ(c)
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