MESON Chess Problem Database

Problem Display
PID: 121086 (4k3/4P3/4K3/4n3/8/4b3/8/4Q3 w - - 0 1)

Niemeijer, Meindert

Inspanning en Ontspanning, 1969

4k3/4P3/4K3/4n3/8/4b3/8/4Q3

#2

3 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qh4?
      • threat
        • 2.Qh8#
      • 1...Sg6
        • 2.Qa4#
      • 1...Sd7
        • 2.Qh5#
      • 1...Sf7
        • 2.Qa4#
      • 1...Bh6!
    • 1.Qa5?
      • threat
        • 2.Qd8#
        • 2.Qa8#
      • 1...Ba7
        • 2.Qd8#
      • 1...Sc6
        • 2.Qh5#
      • 1...Sd7
        • 2.Qd8#
        • 2.Qh5#
      • 1...Sf7
        • 2.Qa4#
        • 2.Qb5#
      • 1...Bb6!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Qa8#
        • 2.Qh8#
      • 1...Bb6
        • 2.Qh8#
      • 1...Bh6
        • 2.Qa8#
      • 1...Ba7
        • 2.Qh8#
      • 1...Sf3
        • 2.Qh5#
        • 2.Qh8#
      • 1...Sc6
        • 2.Qxc6#
        • 2.Qh5#
        • 2.Qh8#
      • 1...Sg6
        • 2.Qc6#
        • 2.Qa8#
      • 1...Sd7
        • 2.Qh5#
      • 1...Sf7
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • S(b);N_GUARD::QAB(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR1(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • B(a);
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • B(a);::QAR(A)
      • S(b);N_GUARD::QAB(A)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).