MESON Chess Problem Database

Problem Display
PID: 42755 (2nB2N1/1p1p4/1pk3r1/3Rp3/1p4p1/1K2N3/6pQ/8 w - - 0 1)

Doukhan, Gerard

Schach-Echo, 1979

2nB2N1/1p1p4/1pk3r1/3Rp3/1p4p1/1K2N3/6pQ/8

#2

6 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Se7#
    • 1...Sa7
      • 2.Se7#
    • 1...Se7
      • 2.Sxe7#
    • 1...g1Q
      • 2.Qc2#
    • 1...g1S
      • 2.Qc2#
    • 1...g1B
      • 2.Qc2#
    • 1...g1R
      • 2.Qc2#
    • 1...e4
      • 2.Qc7#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Qc1#
      • 1...Sd6
        • 2.Se7#
      • 1...d6!
    • 1.Qxe5?
      • threat
        • 2.Qc7#
      • 1...d6
        • 2.Qe8#
      • 1...Sd6
        • 2.Se7#
      • 1...Rd6!
    • 1.Qxg2?
      • threat
        • 2.Qc2#
      • 1...Sd6
        • 2.Se7#
      • 1...d6!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qxd7#
      • 1...Rd6
        • 2.Qc2#
      • 1...Rg7
        • 2.Qc2#
      • 1...Sd6
        • 2.Se7#
      • 1...Se7
        • 2.Sxe7#
      • 1...d6
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(j);N_GUARD::S(F)
    • S(j);N_GUARD::S(F),XS(j)
    • P(a);OGATE::QAR(A)
    • P(d);OGATE::QAR1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • S(j);N_GUARD::S(F)
      • Refutation
        • P(i);
    • Try
      • Q(A);XP(d)
      • Threat
        • QAR1(A)
      • Vars
        • P(i);OGATEB::QAB(A)
        • S(j);N_GUARD::S(F)
      • Refutation
        • R(g);
    • Try
      • Q(A);XP(a)
      • Threat
        • QAR(A)
      • Vars
        • S(j);N_GUARD::S(F)
      • Refutation
        • P(i);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XP(i)
    • Vars
      • R(g);OGATE::QAR(A)
      • S(j);N_GUARD::S(F)
      • S(j);N_GUARD::S(F),XS(j)
      • P(i);OGATE::QAR1(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).