MESON Chess Problem Database

Problem Display
PID: 217756 (5Nbk/6p1/Q7/8/3p4/8/8/K7 w - - 0 1)

Ernst, Erich

Badische Neueste Nachrichten, 1995

5Nbk/6p1/Q7/8/3p4/8/8/K7

#2

3 + 4

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Qf6#
    • 1...g6
      • 2.Qf6#
  • Tries
    • 1.Qg6?
      • 1...Ba2
        • 2.Qh7#
      • 1...Bb3
        • 2.Qh7#
      • 1...Bc4
        • 2.Qh7#
      • 1...Bd5
        • 2.Qh7#
      • 1...Be6
        • 2.Qh7#
      • 1...Bf7
        • 2.Qh7#
      • 1...Bh7
        • 2.Qxh7#
      • 1...d3!
    • 1.Qh6+?
      • 1...Bh7
        • 2.Qxh7#
      • 1...gxh6!
  • Keys
    • 1.Qd3!
      • 1...Ba2
        • 2.Qh7#
      • 1...Bb3
        • 2.Qh7#
      • 1...Bc4
        • 2.Qh7#
      • 1...Bd5
        • 2.Qh7#
      • 1...Be6
        • 2.Qh7#
      • 1...Bf7
        • 2.Qh7#
      • 1...Bh7
        • 2.Qxh7#
      • 1...g5
        • 2.Qxd4#
      • 1...g6
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • B(c);N_GUARD::QAR1(B)
        • B(c);N_GUARD::QAR1(B),XB(c)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(B),XB(c)
      • Refutation
        • P(b);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • B(c);N_GUARD::QAR1(B)
      • B(c);N_GUARD::QAR1(B),XB(c)
      • P(b);OGATEB::QAB(B),XP(a)
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