MESON Chess Problem Database

Problem Display
PID: 139681 (8/4Np1R/2Q5/4p1k1/6n1/6Kb/8/8 w - - 0 1)

Ulanov, Lev

Shakhmaty v SSSR, 1949

8/4Np1R/2Q5/4p1k1/6n1/6Kb/8/8

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qh6#
    • 1...Sh2
      • 2.Qh6#
    • 1...Se3
      • 2.Qh6#
    • 1...Sf6
      • 2.Qc1#
    • 1...Sh6
      • 2.Qxh6#
    • 1...f5
      • 2.Qg6#
  • Tries
    • 1.Rxf7?
      • threat
        • 2.Rf5#
        • 2.Qg6#
      • 1...Kh5
        • 2.Rf5#
        • 2.Qg6#
      • 1...Sf2
        • 2.Qg6#
      • 1...Sh2
        • 2.Qg6#
      • 1...Se3
        • 2.Qg6#
      • 1...Sh6
        • 2.Qg6#
      • 1...Sf6!
    • 1.Qe4?
      • threat
        • 2.Qf5#
      • 1...Sh6
        • 2.Qh4#
      • 1...Sf2
        • 2.Qh4#
      • 1...Sh2
        • 2.Qh4#
      • 1...Se3
        • 2.Qh4#
      • 1...Sf6
        • 2.Qe3#
        • 2.Qh4#
      • 1...f5
        • 2.Qxf5#
      • 1...Kf6!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qf5#
      • 1...f5
        • 2.Qxf5#
      • 1...Sf2
        • 2.Rh5#
      • 1...Sh2
        • 2.Rh5#
      • 1...Se3
        • 2.Rh5#
      • 1...Sf6
        • 2.Qe3#
      • 1...Sh6
        • 2.Rg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB1(B)
    • S(b);N_GUARD,SBLOCK::QAB(B)
    • S(b);N_GUARD::QAB1(B),XS(b)
    • P(e);N_GUARD::QAR1(B)
  • Tries
    • Try
      • R(D);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::QAR1(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(b);OGATE::QAB1(B)
        • P(e);::QAR1(B),XP(e)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • P(e);::QAR1(B),XP(e)
      • S(b);::R1(D)
      • S(b);N_GUARD,SBLOCK::QAB(B)
      • S(b);SBLOCK::R(D)
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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).