MESON Chess Problem Database

Problem Display
PID: 7781 (2k5/1pP1K3/2R5/4p3/8/8/1Q6/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

The Problemist, 1993

2k5/1pP1K3/2R5/4p3/8/8/1Q6/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...e4
      • 2.Qh8#
    • 1...bxc6
      • 2.Qb8#
  • Tries
    • 1.Qa3?
      • threat
        • 2.Qh3#
        • 2.Qa8#
      • 1...b5
        • 2.Qa6#
        • 2.Qa8#
      • 1...b6
        • 2.Qa6#
        • 2.Qa8#
      • 1...bxc6!
    • 1.Qa2?
      • threat
        • 2.Qe6#
        • 2.Qg8#
        • 2.Qa8#
      • 1...b5
        • 2.Qa6#
        • 2.Qa8#
      • 1...b6
        • 2.Qa6#
        • 2.Qa8#
      • 1...bxc6!
    • 1.Qb6?
      • 1...bxc6
        • 2.Qb8#
      • 1...e4!
  • Keys
    • 1.Qb5!
      • 1...bxc6
        • 2.Qb8#
      • 1...b6
        • 2.Qa6#
      • 1...e4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE::QAR(A)
    • P(b);OGATE,XR(B)::QAR1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(A);
      • Vars
        • P(b);OGATE,XR(B)::QAR1(A)
      • Refutation
        • P(a);
  • Actual
    • Q(A);
    • Vars
      • P(b);OGATE,XR(B)::QAR1(A)
      • P(b);OGATEB::QAB(A)
      • P(a);OGATE::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).