MESON Chess Problem Database

Problem Display
PID: 166713 (r5k1/6B1/3N3K/1b6/8/8/7Q/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2016

r5k1/6B1/3N3K/1b6/8/8/7Q/8

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Qa2+?
      • 1...Bc4
        • 2.Qxc4#
        • 2.Qxa8#
      • 1...Rxa2!
    • 1.Qf2?
      • threat
        • 2.Qf7#
      • 1...Ra7
        • 2.Qf8#
      • 1...Rf8
        • 2.Qxf8#
      • 1...Be8
        • 2.Qf8#
      • 1...Bc4!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qf7#
      • 1...Ra7
        • 2.Qf8#
      • 1...Rf8
        • 2.Qxf8#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Be8
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • R(b);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(b);N_GUARD::QAR1(A)
        • R(b);N_GUARD::QAR1(A),XR(b)
        • B(a);S_CUTR(b)::QAR1(A)
      • Refutation
        • B(a);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • R(b);N_GUARD::QAR1(A)
      • R(b);N_GUARD::QAR1(A),XR(b)
      • B(a);N_GUARD::QAB(A),XB(a)
      • B(a);S_CUTR(b)::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).