MESON Chess Problem Database

Problem Display
PID: 273343 (r3k1n1/8/2P1K3/8/7Q/8/8/8 w q - 0 1)

Hannelius, Jan Ingvar

Springaren, 1990

r3k1n1/8/2P1K3/8/7Q/8/8/8

#2

3 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sh6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Qh5+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kd8!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qxg8#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...0-0-0
        • 2.Qb7#
      • 1...Sf6
        • 2.Qe7#
      • 1...Sh6
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR1(A)
    • S(c);N_GUARD::QAR1(A),XS(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A),XS(c)
    • Vars
      • K(b);N_GUARD,P-FLIGHT::QAR1(A)
      • K(b);0-0-0,OGATEB::QAB1(A)
      • S(c);N_GUARD::QAR1(A)
      • S(c);N_GUARD::QAR1(A),XS(c)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).