MESON Chess Problem Database

Problem Display
PID: 45138 (4R1Q1/3p4/2p1n2K/1pRnP3/4k1P1/1N6/4P1N1/8 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

4R1Q1/3p4/2p1n2K/1pRnP3/4k1P1/1N6/4P1N1/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sb4
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sb6
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sf6
      • 2.Qg6#
    • 1...Sdc7
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sd4
      • 2.Sd2#
    • 1...Sxc5
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sg5
      • 2.Qg6#
    • 1...Sec7
      • 2.Qh7#
      • 2.Qg6#
    • 1...Sd8
      • 2.Qh7#
      • 2.Qg6#
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qf5#
      • 1...Kxe5
        • 2.Qf4#
      • 1...Se3
        • 2.Qf3#
      • 1...Sf6
        • 2.Qg6#
      • 1...Se7
        • 2.Qf3#
      • 1...Sd4
        • 2.Sd2#
      • 1...Sg7
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(c);::QAB(I)
    • S(e);SBLOCK::S(C)
    • S(e);::QAB(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • K(a);P-FLIGHT,P_SPINS(c),XP(F)::QAB1(I)
      • S(c);::QAB1(I)
      • S(c);::QAB(I)
      • S(e);SBLOCK::S(C)
      • S(e);::QAB1(I)
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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).