MESON Chess Problem Database

Problem Display
PID: 169008 (8/8/kPQ5/b7/8/8/R7/2B3K1 w - - 0 1)

Lincoln, Robert A

SuperProblem, 2017

8/8/kPQ5/b7/8/8/R7/2B3K1

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Rb2?
      • threat
        • 2.Qa8#
        • 2.Qc8#
      • 1...Bxb6+
        • 2.Qxb6#
      • 1...Be1
        • 2.Qa8#
      • 1...Bd2
        • 2.Qa8#
      • 1...Bc3
        • 2.Qa8#
      • 1...Bb4!
  • Keys
    • 1.Ba3!
      • 1...Bxb6+
        • 2.Bc5#
      • 1...Be1
        • 2.Bb4#
      • 1...Bd2
        • 2.Bb4#
      • 1...Bc3
        • 2.Bb4#
      • 1...Bb4
        • 2.Bxb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);N_PINB(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XP(D)::QAR1(E),XB(a)
        • B(a);::QAR2(E)
      • Refutation
        • B(a);
  • Actual
    • B(A);N_PINB(a)
    • Vars
      • B(a);CHECK,OGATEB,P_SPINB(a),XP(D)::R(C)+B(A)
      • B(a);OGATEB::R(C)+B(A)
      • B(a);OGATEB::R(C)+B(A),XB(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).