MESON Chess Problem Database

Problem Display
PID: 51142 (8/4N3/1p2N1pp/4p3/3pk3/4p2p/4Q2K/8 w - - 0 1)

Allison, Christopher John

Manchester Guardian, 1951

8/4N3/1p2N1pp/4p3/3pk3/4p2p/4Q2K/8

#2

4 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qg4#
  • Tries
    • 1.Qc2+?
      • 1...d3
        • 2.Qc6#
      • 1...Kf3!
  • Keys
    • 1.Qf1!
      • 1...e2
        • 2.Qxe2#
      • 1...b5
        • 2.Sc5#
      • 1...d3
        • 2.Qh1#
      • 1...g5
        • 2.Qf5#
      • 1...h5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • P(c);P_SPINP(c),SBLOCK::QAB(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(A);N_PINP(a)
    • Vars
      • P(a);OGATEB::QAR2(A),XP(a)
      • P(f);N_GUARD::S(C)
      • P(c);SBLOCK::QAB(A)
      • P(g);N_GUARD::QAB1(A)
      • P(h);N_GUARD::S(C)
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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).