MESON Chess Problem Database

Problem Display
PID: 100777 (3NkN2/8/3Q1Pr1/K2n2n1/8/8/8/8 w - - 0 1)

Mach, Julius Zdenek

Narodni osvobozeni, 1924

3NkN2/8/3Q1Pr1/K2n2n1/8/8/8/8

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Qe7#
    • 1...Se3
      • 2.Qe7#
    • 1...Sb4
      • 2.Qe7#
    • 1...Sf4
      • 2.Qe7#
    • 1...Sb6
      • 2.Qe7#
    • 1...Sc7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sf3
      • 2.f7#
    • 1...Sh3
      • 2.f7#
    • 1...Se4
      • 2.f7#
    • 1...Se6
      • 2.f7#
    • 1...Sh7
      • 2.f7#
  • Tries
    • 1.Sxg6?
      • 1...Sxf6
        • 2.Qe7#
      • 1...Sc3
        • 2.Qe7#
      • 1...Se3
        • 2.Qe7#
      • 1...Sb4
        • 2.Qe7#
      • 1...Sf4
        • 2.Qe7#
      • 1...Sb6
        • 2.Qe7#
      • 1...Sc7
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sf3
        • 2.f7#
      • 1...Sh3
        • 2.f7#
      • 1...Se4
        • 2.f7#
      • 1...Se6
        • 2.f7#
      • 1...Sh7
        • 2.f7#
      • 1...Sf7!
    • 1.Qc6+?
      • 1...Kxd8
        • 2.Qd7#
      • 1...Kxf8!
  • Keys
    • 1.Sfe6!
      • threat
        • 2.Qc6#
      • 1...Rxf6
        • 2.Sg7#
      • 1...Sxf6
        • 2.Sc7#
      • 1...Sxe6
        • 2.f7#
      • 1...Rg7
        • 2.Sxg7#
      • 1...Sb4
        • 2.Sc7#
        • 2.Qe7#
      • 1...Sb6
        • 2.Sc7#
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 10
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
    • S(b);N_GUARD::P(C)
  • Tries
    • Try
      • S(E);XR(c)
      • Vars
        • S(a);N_GUARD,XP(C)::QAR1(B)
        • S(a);N_GUARD::QAR1(B)
        • S(a);N_GUARD::QAR1(B),XS(a)
        • S(b);N_GUARD::P(C)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • K(d);P-FLIGHT,XS(E)
  • Actual
    • S(E);
    • Threat
      • QAB(B)
    • Vars
      • R(c);N_GUARD,XP(C)::S(E)
      • S(a);N_GUARD,XP(C)::S(E)
      • S(b);N_GUARD,XS(E)::P(C)
      • R(c);N_GUARD::S(E),XR(c)
      • S(a);N_GUARD::QAR1(B),XS(a)
HTML5 logo

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).