MESON Chess Problem Database

Problem Display
PID: 193383 (8/8/N7/p3n3/k7/p7/2P1Q3/3K4 w - - 0 1)

van Dijk, Johannes

Algemeen Handelsblad, 1914

8/8/N7/p3n3/k7/p7/2P1Q3/3K4

#2

4 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qe8#
    • 1...Sf3
      • 2.Qc4#
      • 2.Qe8#
    • 1...Sc4
      • 2.Qxc4#
      • 2.Qe8#
    • 1...Sg4
      • 2.Qc4#
      • 2.Qe8#
    • 1...Sg6
      • 2.Qc4#
      • 2.Qe8#
    • 1...Sd7
      • 2.Qc4#
    • 1...Sf7
      • 2.Qc4#
      • 2.Qe8#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qb3#
      • 1...Sd3
        • 2.Qe8#
      • 1...Kb5!
    • 1.Qe4+?
      • 1...Sc4
        • 2.Qc6#
        • 2.Qxc4#
        • 2.Qe8#
      • 1...Kb5!
  • Keys
    • 1.c4!
      • threat
        • 2.Qc2#
      • 1...Kb3
        • 2.Qc2#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...a2
        • 2.Qxa2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(d);OGATE::QAB(C)
    • S(d);N_GUARD::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(d);OGATE::QAB(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • P(B);
    • Threat
      • QAB(C)
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
      • S(d);OGATE,XP(B)::QAR2(C),XS(d)
      • P(a);OGATEB::QAR2(C),XP(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).