MESON Chess Problem Database

Problem Display
PID: 68449 (8/8/2K5/2n5/2N5/1kp5/1N6/Q7 w - - 0 1)

Lincoln, Robert A

Problem Observer, 2006

8/8/2K5/2n5/2N5/1kp5/1N6/Q7

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kc2
      • 2.Qd1#
    • 1...Kb4
      • 2.Qa3#
    • 1...Sd3
      • 2.Qa4#
    • 1...Sa4
      • 2.Qxa4#
    • 1...Se4
      • 2.Qa4#
    • 1...Sa6
      • 2.Qa4#
    • 1...Se6
      • 2.Qa4#
    • 1...Sb7
      • 2.Qa4#
    • 1...Sd7
      • 2.Qa4#
    • 1...c2
      • 2.Qa3#
  • Tries
    • 1.Kxc5?
      • threat
        • 2.Qa4#
      • 1...Kc2
        • 2.Qd1#
      • 1...c2
        • 2.Qa3#
      • 1...cxb2!
  • Keys
    • 1.Kb5!
      • 1...Kc2
        • 2.Qd1#
      • 1...cxb2
        • 2.Qxb2#
      • 1...Sd3
        • 2.Qa4#
      • 1...Sa4
        • 2.Qxa4#
      • 1...Se4
        • 2.Qa4#
      • 1...Sa6
        • 2.Qa4#
      • 1...Se6
        • 2.Qa4#
      • 1...Sb7
        • 2.Qa4#
      • 1...Sd7
        • 2.Qa4#
      • 1...c2
        • 2.Qa3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAB1(A)
    • K(a);P-FLIGHT::QAB1(A)
    • S(c);N_GUARD::QAB1(A)
    • S(c);N_GUARD::QAB1(A),XS(c)
    • P(b);SBLOCK::QAR1(A)
  • Tries
    • Try
      • K(D);P-FLIGHT,XS(c)
      • Threat
        • QAB1(A)
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • P(b);SBLOCK::QAR1(A)
      • Refutation
        • P(b);XS(B)
  • Actual
    • K(D);S_FLIGHT
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • P(b);OGATE,XS(B)::QAR1(A),XP(b)
      • S(c);N_GUARD::QAB1(A)
      • S(c);N_GUARD::QAB1(A),XS(c)
      • P(b);SBLOCK::QAR1(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).