MESON Chess Problem Database

Problem Display
PID: 276905 (7k/5K1N/6p1/8/8/8/6n1/3b3Q w - - 0 1)

Bakke, Nils Adrian

Stella Polaris, 1971

7k/5K1N/6p1/8/8/8/6n1/3b3Q

#2

3 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Sf6+?
      • 1...Sh4
        • 2.Qa8#
      • 1...Bh5!
    • 1.Sf8+?
      • 1...Bh5
        • 2.Qa1#
      • 1...Sh4!
    • 1.Qh6?
      • threat
        • 2.Sg5#
        • 2.Sf6#
        • 2.Sf8#
        • 2.Qg7#
      • 1...g5
        • 2.Sxg5#
        • 2.Sf6#
        • 2.Sf8#
        • 2.Qg7#
      • 1...Bb3+!
  • Keys
    • 1.Sg5+!
      • 1...Bh5
        • 2.Qa1#
      • 1...Sh4
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • S(b);OGATE,P_SPINS(b)::QAB1(A)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • S(C);CHECK
      • Vars
        • B(a);OGATE,P_SPINB(a)::QAB(A)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Refutation
        • B(a);CHECK
  • Actual
    • S(C);CHECK
    • Vars
      • B(a);OGATE,P_SPINB(a)::QAB(A)
      • S(b);OGATE,P_SPINS(b)::QAB1(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).