MESON Chess Problem Database

Problem Display
PID: 16518 (3Bk2r/1N4pr/2nQ2Pp/8/3n4/8/6K1/8 w - - 0 1)

Gunn, Robert Ivan

Chess, 1941

3Bk2r/1N4pr/2nQ2Pp/8/3n4/8/6K1/8

#2

5 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qe7#
    • 1...Sa5
      • 2.Qe7#
    • 1...Se5
      • 2.Qe7#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sb8
      • 2.Qe7#
    • 1...Sxd8
      • 2.Qxd8#
  • Tries
    • 1.Qe6+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sxe6!
    • 1.Qd7+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kxd7!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qf7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Sxd8
        • 2.Qxd8#
      • 1...Rf8
        • 2.Sd6#
      • 1...Se5
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
    • S(b);OGATE,XB(E)::QAR1(B),XS(b)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(B)
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(B)
      • Refutation
        • K(f);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(f);P-FLIGHT::QAR1(B)
      • S(b);OGATE,XB(E)::QAR1(B),XS(b)
      • R(g);SBLOCK::S(D)
      • S(b);N_GUARD::QAR1(B)
      • S(b);N_GUARD::QAR1(B),XS(b)
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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).