MESON Chess Problem Database

Problem Display
PID: 177916 (n2K2n1/1B1p2N1/3k4/r2p2r1/1P3P2/2Q5/8/8 w - - 0 1)

Zigalov, Aleksandr

Sahs (Latvia), 1982

n2K2n1/1B1p2N1/3k4/r2p2r1/1P3P2/2Q5/8/8

#2

6 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc5#
    • 1...Ra2
      • 2.Qc5#
    • 1...Ra3
      • 2.Qc5#
    • 1...Ra4
      • 2.Qc5#
    • 1...Rc5
      • 2.Qxc5#
      • 2.bxc5#
    • 1...Ra6
      • 2.Qc5#
    • 1...Ra7
      • 2.Qc5#
    • 1...Rg1
      • 2.Qe5#
    • 1...Rg2
      • 2.Qe5#
    • 1...Rg3
      • 2.Qe5#
    • 1...Rg4
      • 2.Qe5#
    • 1...Re5
      • 2.Qxe5#
      • 2.fxe5#
    • 1...Rg6
      • 2.Qe5#
    • 1...Rxg7
      • 2.Qe5#
    • 1...Sb6
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sh6
      • 2.Qf6#
    • 1...Se7
      • 2.Qf6#
  • Tries
    • 1.Bxa8?
      • threat
        • 2.Qc7#
      • 1...Rxg7
        • 2.Qe5#
      • 1...Rc5
        • 2.Qxc5#
        • 2.bxc5#
      • 1...Ra7
        • 2.Qc5#
      • 1...Rxa8+!
    • 1.Qe1?
      • threat
        • 2.Se8#
      • 1...Rxg7
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
        • 2.fxe5#
      • 1...Sf6
        • 2.Qe7#
      • 1...Sc7!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Se8#
      • 1...Rxg7
        • 2.Qe5#
      • 1...Re5
        • 2.Qxe5#
        • 2.fxe5#
      • 1...Sc7
        • 2.Qb6#
      • 1...Sf6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 14
  • Sets
    • R(a);N_GUARD::QAB1(A)
    • R(c);N_GUARD::QAB1(A)
    • R(c);N_GUARD,XS(E)::QAB1(A)
    • S(f);N_GUARD::QAB1(A)
    • S(f);N_GUARD::QAB1(A),XS(f)
    • S(g);N_GUARD::QAR2(A),XS(g)
    • S(g);N_GUARD::QAR2(A)
  • Tries
    • Try
      • B(D);XS(f)
      • Threat
        • QAB1(A)
      • Vars
        • R(c);N_GUARD,XS(E)::QAB1(A)
        • R(a);N_GUARD::QAB1(A)
      • Refutation
        • R(a);CHECK,XB(D)
    • Try
      • Q(A);
      • Threat
        • S(E)
      • Vars
        • R(c);N_GUARD,XS(E)::QAB1(A)
        • S(g);N_GUARD::QAB1(A)
      • Refutation
        • S(f);
  • Actual
    • Q(A);
    • Threat
      • S(E)
    • Vars
      • R(c);N_GUARD,XS(E)::QAB1(A)
      • S(f);N_GUARD::QAR2(A)
      • S(g);N_GUARD::QAB1(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).