MESON Chess Problem Database

Problem Display
PID: 214765 (1Q6/8/4Kp2/p2p4/PN2k2p/7R/8/8 w - - 0 1)

English, William

Detroit Free Press, 1878

1Q6/8/4Kp2/p2p4/PN2k2p/7R/8/8

#2

5 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Sc6?
      • 1...f5
        • 2.Qe5#
      • 1...d4!
    • 1.Qh8?
      • threat
        • 2.Qxh4#
      • 1...Kf4
        • 2.Qxh4#
      • 1...f5
        • 2.Qe5#
      • 1...Kd4!
  • Keys
    • 1.Sa6!
      • 1...Kd4
        • 2.Qf4#
      • 1...d4
        • 2.Sc5#
      • 1...f5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(e);N_GUARD::QAR1(E)
  • Tries
    • Try
      • S(C);
      • Vars
        • P(e);N_GUARD::QAR1(E)
      • Refutation
        • P(d);
    • Try
      • Q(E);
      • Threat
        • QAR(E),XP(b)
      • Vars
        • K(a);P-FLIGHT::QAR2(E),XP(b)
        • P(e);OGATE::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(e)
  • Actual
    • S(C);
    • Vars
      • K(a);P-FLIGHT::QAR2(E)
      • P(d);SBLOCK::S(C)
      • P(e);N_GUARD::QAR1(E)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).