MESON Chess Problem Database

Problem Display
PID: 46631 (8/6QK/8/8/5N2/5p2/8/5rBk w - - 0 1)

Nielsen, Kristian

Ostledingen, 1957

8/6QK/8/8/5N2/5p2/8/5rBk

#2

4 + 3

4884 154 norske miniatyrproblemer 1974
4883 Still More Fun with Chess Miniatures 2002
136 Problem Observer 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg1
      • 2.Qh6#
    • 1...f2
      • 2.Qg2#
  • Tries
    • 1.Bf2?
      • threat
        • 2.Qh6#
      • 1...Kh2
        • 2.Qh6#
      • 1...Rxf2!
    • 1.Qg3?
      • threat
        • 2.Qh2#
      • 1...Rxg1
        • 2.Qh4#
        • 2.Qh3#
      • 1...Rf2!
  • Keys
    • 1.Sh3!
      • 1...Rxg1
        • 2.Qxg1#
      • 1...Ra1
        • 2.Sf2#
      • 1...Rb1
        • 2.Sf2#
      • 1...Rc1
        • 2.Sf2#
      • 1...Rd1
        • 2.Sf2#
      • 1...Re1
        • 2.Sf2#
      • 1...Rf2
        • 2.Sxf2#
      • 1...f2
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK,XB(A)::QAR(C)
    • P(c);N_GUARD::QAB1(C)
  • Tries
    • Try
      • B(A);
      • Threat
        • QAR(C)
      • Vars
        • K(b);P-FLIGHT::QAR(C)
      • Refutation
        • R(a);XB(A)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Refutation
        • R(a);
  • Actual
    • S(B);
    • Vars
      • R(a);OGATE,XB(A)::QAR1(C),XR(a)
      • R(a);N_GUARD::S(B)
      • R(a);N_GUARD::S(B),XR(a)
      • P(c);OGATEB::QAB(C)
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