MESON Chess Problem Database

Problem Display
PID: 133655 (8/8/5n2/6b1/8/6Pk/4QB2/7K w - - 0 1)

Lincoln, Robert A

StrateGems, 2009

8/8/5n2/6b1/8/6Pk/4QB2/7K

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Qf1#
    • 1...Sd5
      • 2.Qe6#
    • 1...Sh5
      • 2.Qe6#
    • 1...Sd7
      • 2.Qe6#
    • 1...Sh7
      • 2.Qe6#
    • 1...Se8
      • 2.Qe6#
    • 1...Sg8
      • 2.Qe6#
  • Tries
    • 1.Qc4?
      • 1...Se4
        • 2.Qe6#
        • 2.Qc8#
      • 1...Bc1
        • 2.Qh4#
      • 1...Bd2
        • 2.Qh4#
      • 1...Be3
        • 2.Qh4#
      • 1...Bh4
        • 2.Qxh4#
      • 1...Bh6
        • 2.Qh4#
      • 1...Sg4
        • 2.Qf1#
      • 1...Sd5
        • 2.Qc8#
      • 1...Sh5
        • 2.Qe6#
        • 2.Qc8#
      • 1...Sd7
        • 2.Qe6#
      • 1...Sh7
        • 2.Qe6#
        • 2.Qc8#
      • 1...Se8
        • 2.Qe6#
        • 2.Qc8#
      • 1...Sg8
        • 2.Qe6#
        • 2.Qc8#
      • 1...Bf4!
    • 1.Qh5+?
      • 1...Bh4
        • 2.Qxh4#
      • 1...Sxh5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.g4#
      • 1...Bf4
        • 2.gxf4#
      • 1...Bh4
        • 2.gxh4#
      • 1...Se4
        • 2.Qf5#
      • 1...Sg4
        • 2.Qg2#
      • 1...Sh5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • S(c);SBLOCK::QAB(B)
    • S(c);N_GUARD::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • B(b);N_GUARD::QAR1(B)
        • B(b);N_GUARD::QAR1(B),XB(b)
        • S(c);SBLOCK::QAB(B)
        • S(c);N_GUARD::QAB(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(B),XB(b)
      • Refutation
        • S(c);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+P(D)
    • Vars
      • B(b);OGATE::QAR(B)+P(D),XB(b)
      • S(c);N_GUARD::QAB(B)
      • S(c);SBLOCK::QAB1(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).