MESON Chess Problem Database

Problem Display
PID: 66772 (nB6/2p5/1p3p2/1P1P3B/4k1p1/1NR1N3/8/3Q3K w - - 0 1)

Afek, Yochanan

diagrammes, 1976

nB6/2p5/1p3p2/1P1P3B/4k1p1/1NR1N3/8/3Q3K

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qd4#
    • 1...c5
      • 2.Qxg4#
    • 1...c6
      • 2.Qxg4#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Qf5#
      • 1...f5
        • 2.Qxf5#
      • 1...Ke5!
  • Keys
    • 1.Sc4!
      • 1...Kf4
        • 2.Qxg4#
      • 1...Kf5
        • 2.Qxg4#
      • 1...g3
        • 2.Qf3#
      • 1...f5
        • 2.Qd4#
      • 1...c5
        • 2.Qd3#
      • 1...c6
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);::QAR1(A)
    • P(e);::QAR2(A),XP(b)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(d);::QAB1(A),XP(d)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(e)
  • Actual
    • S(E);
    • Vars
      • K(a);P-FLIGHT,P_SPINP(e)::QAR1(A),XP(b)
      • K(a);S_FLIGHT::QAB1(A),XP(b)
      • P(b);N_GUARD::QAB1(A)
      • P(d);SBLOCK::QAR1(A)
      • P(e);::QAB1(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).