MESON Chess Problem Database

Problem Display
PID: 182720 (1rk5/1pP5/3PK3/R7/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Problem Observer, 2015

1rk5/1pP5/3PK3/R7/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Rxa8#
  • Tries
    • 1.Ra8?
      • threat
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...b5
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...b6
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rxa8!
  • Keys
    • 1.Ra7!
      • 1...Ra8
        • 2.Rxa8#
      • 1...b5
        • 2.d7#
      • 1...b6
        • 2.d7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATEB::R(A),XR(b)
  • Tries
    • Try
      • R(A);P_PINR(b)
      • Threat
        • DUALS(3)
      • Refutation
        • R(b);N_SPINR(b),XR(A)
  • Actual
    • R(A);
    • Vars
      • R(b);OGATEB::R(A),XR(b)
      • P(a);::P(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).