MESON Chess Problem Database

Problem Display
PID: 101081 (6nr/3n2Np/8/1B1kB3/P2PN2Q/r7/p2P4/K7 w - - 0 1)

Malmstrom, Birger Georg Christens

Good Companions, 1921

6nr/3n2Np/8/1B1kB3/P2PN2Q/r7/p2P4/K7

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Sxc3#
    • 1...Rxa4
      • 2.Sc3#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...Rf3
        • 2.Sc3#
      • 1...Rc3
        • 2.Sxc3#
        • 2.Sf6#
      • 1...Sdf6
        • 2.Sc3#
        • 2.Sxf6#
      • 1...Sgf6
        • 2.Sc3#
        • 2.Sxf6#
      • 1...Sxe5!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qa8#
      • 1...Kxe4
        • 2.Qa8#
      • 1...Rxa4
        • 2.Sc3#
      • 1...Rc3
        • 2.Sxc3#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...Se7
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::S(E),XR(b)
    • R(b);N_GUARD,XP(C)::S(E)
  • Tries
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::S(E)
      • Refutation
        • S(d);XB(H)
  • Actual
    • Q(F);P_PINS(d)
    • Threat
      • QAB(F)
    • Vars
      • K(c);N_SPINS(d),S_FLIGHT,XS(E)::QAB(F)
      • R(b);N_GUARD,XP(C)::S(E)
      • R(b);N_GUARD::S(E),XR(b)
      • S(f);N_GUARD::S(E),XS(f)
      • S(f);N_GUARD::S(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).