MESON Chess Problem Database

Problem Display
PID: 102430 (8/3n4/8/pp6/kN6/P3pQ2/2KN4/R2n4 w - - 0 1)

Lider, Valentin Viktorovich

Europe Echecs, 1964

8/3n4/8/pp6/kN6/P3pQ2/2KN4/R2n4

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...exd2
      • 2.Qb3#
    • 1...e2
      • 2.Qb3#
    • 1...axb4
      • 2.Qa8#
  • Tries
    • 1.Se4?
      • 1...Sb2
        • 2.Sc3#
      • 1...Sf2
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Se5
        • 2.Sc5#
      • 1...Sb6
        • 2.Sc5#
      • 1...Sf6
        • 2.Sc5#
      • 1...Sb8
        • 2.Sc5#
      • 1...Sf8
        • 2.Sc5#
      • 1...e2
        • 2.Qb3#
      • 1...axb4!
    • 1.Sd5?
      • 1...exd2
        • 2.Qb3#
      • 1...Sb2
        • 2.Sc3#
      • 1...Sf2
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sc5
        • 2.Sb6#
      • 1...Se5
        • 2.Sb6#
      • 1...Sb6
        • 2.Sxb6#
      • 1...Sf6
        • 2.Sb6#
      • 1...Sb8
        • 2.Sb6#
      • 1...Sf8
        • 2.Sb6#
      • 1...e2
        • 2.Qb3#
      • 1...b4!
    • 1.Qd5?
      • threat
        • 2.Qb3#
      • 1...axb4
        • 2.Qa8#
      • 1...Sc5!
  • Keys
    • 1.Sc4!
      • 1...axb4
        • 2.Qa8#
      • 1...bxc4
        • 2.Qc6#
      • 1...Sb2
        • 2.Sxb2#
      • 1...Sf2
        • 2.Sb2#
      • 1...Sc3
        • 2.Sb2#
      • 1...Sc5
        • 2.Sb6#
      • 1...Se5
        • 2.Sb6#
      • 1...Sb6
        • 2.Sxb6#
      • 1...Sf6
        • 2.Sb6#
      • 1...Sb8
        • 2.Sb6#
      • 1...Sf8
        • 2.Sb6#
      • 1...e2
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATE,XS(C)::QAB1(E)
    • P(b);OGATE::QAB1(E)
    • P(d);OGATEB,XS(F)::QAR(E)
  • Tries
    • Try
      • S(C);
      • Vars
        • S(a);N_GUARD::S(C)
        • S(a);N_GUARD::S(C),XS(a)
        • S(f);N_GUARD::S(C),XS(f)
        • S(f);N_GUARD::S(C)
        • P(b);OGATE::QAB1(E)
      • Refutation
        • P(d);XS(F)
    • Try
      • S(F);
      • Vars
        • P(b);OGATE,XS(C)::QAB1(E)
        • S(a);N_GUARD::S(F)
        • S(a);N_GUARD::S(F),XS(a)
        • S(f);N_GUARD::S(F)
        • S(f);N_GUARD::S(F),XS(f)
        • P(b);OGATE::QAB1(E)
      • Refutation
        • P(e);
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • P(d);OGATEB,XS(F)::QAR(E)
      • Refutation
        • S(f);
  • Actual
    • S(C);
    • Vars
      • P(d);OGATEB,XS(F)::QAR(E)
      • P(e);OGATEB,XS(C)::QAB(E)
      • S(a);N_GUARD::S(C),XS(a)
      • S(a);N_GUARD::S(C)
      • S(f);N_GUARD::S(C)
      • S(f);N_GUARD::S(C),XS(f)
      • P(b);OGATE::QAB1(E)
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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).