MESON Chess Problem Database

Problem Display
PID: 166009 (k1b5/ppK5/1R6/8/1Q6/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2015

k1b5/ppK5/1R6/8/1Q6/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...axb6
      • 2.Qa3#
      • 2.Qa4#
    • 1...a5
      • 2.Qxa5#
  • Tries
    • 1.Kxc8?
      • 1...axb6
        • 2.Qa3#
        • 2.Qa4#
      • 1...a5
        • 2.Qxa5#
      • 1...a6!
    • 1.Rxb7?
      • threat
        • 2.Rb8#
      • 1...Bxb7
        • 2.Qxb7#
      • 1...a5
        • 2.Qxa5#
      • 1...a6!
  • Keys
    • 1.Qe4!
      • 1...axb6
        • 2.Qa4#
      • 1...a5
        • 2.Ra6#
      • 1...a6
        • 2.Rxa6#
      • 1...Bh3
        • 2.Qxb7#
      • 1...Bg4
        • 2.Qxb7#
      • 1...Bf5
        • 2.Qxb7#
      • 1...Be6
        • 2.Qxb7#
      • 1...Bd7
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAR(A),XP(a)
  • Tries
    • Try
      • K(C);P-FLIGHT,XB(d)
      • Vars
        • P(a);OGATEB::QAR(A),XP(a)
      • Refutation
        • P(a);
    • Try
      • R(B);XP(b)
      • Threat
        • R1(B)
      • Vars
        • B(d);OGATE,XR(B)::QAB1(A),XB(d)
        • P(a);OGATEB::QAR(A),XP(a)
      • Refutation
        • P(a);
  • Actual
    • Q(A);P_PINP(b)
    • Vars
      • P(a);OGATEB,XR(B)::QAR(A)
      • P(a);OGATEB::R(B)
      • P(a);OGATEB::R(B),XP(a)
      • B(d);N_GUARD::QAB1(A),XP(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).