MESON Chess Problem Database

Problem Display
PID: 15907 (8/2K5/p7/k3p3/2Q5/3N4/8/4q3 w - - 0 1)

Parrinello, Mario

Die Schwalbe, 1989

8/2K5/p7/k3p3/2Q5/3N4/8/4q3

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qf2
      • 2.Qb4#
    • 1...Qg3
      • 2.Qb4#
    • 1...Qb4
      • 2.Qxb4#
    • 1...Qa1
      • 2.Qb4#
    • 1...Qd1
      • 2.Qb4#
    • 1...Qf1
      • 2.Qb4#
    • 1...Qg1
      • 2.Qb4#
    • 1...Qh1
      • 2.Qb4#
    • 1...Qe2
      • 2.Qb4#
    • 1...Qe3
      • 2.Qb4#
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sb3#
        • 2.Sb7#
        • 2.Qa4#
      • 1...Qc3
        • 2.Sb7#
        • 2.Qa4#
      • 1...Qg3
        • 2.Sb7#
        • 2.Qa4#
      • 1...Qb4
        • 2.Qxa6#
      • 1...Qh4
        • 2.Sb3#
        • 2.Sb7#
      • 1...Qa1
        • 2.Sb3#
        • 2.Sb7#
      • 1...Qb1
        • 2.Qa4#
      • 1...Qd1
        • 2.Sb7#
      • 1...Qh1
        • 2.Sb3#
        • 2.Qa4#
      • 1...Qe3
        • 2.Sb7#
        • 2.Qa4#
      • 1...Qe4
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::QAB1(B)
    • Q(a);N_GUARD::QAB1(B),XQ(a)
  • Actual
    • S(A);
    • Threat
      • DUALS(3)
    • Vars
      • Q(a);SBLOCK::QAR1(B),XP(d)
      • Q(a);::QAR1(B)
      • Q(a);::S(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).