MESON Chess Problem Database

Problem Display
PID: 140564 (4nN1B/rn2Pk1P/2QP2Nb/r7/2P5/p7/K7/8 w - - 0 1)

Gunn, Robert Ivan

The Problemist, 1943

4nN1B/rn2Pk1P/2QP2Nb/r7/2P5/p7/K7/8

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Se5#
      • 2.Qd5#
    • 1...Rd5
      • 2.Qxd5#
    • 1...Re5
      • 2.Sxe5#
    • 1...R5a6
      • 2.Se5#
      • 2.Qd5#
    • 1...Sc5
      • 2.Se5#
    • 1...Sd8
      • 2.exd8S#
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qe6#
      • 1...Bxf8
        • 2.exf8S#
      • 1...Sexd6
        • 2.e8Q#
        • 2.e8S#
        • 2.e8B#
        • 2.e8R#
      • 1...Sg7
        • 2.e8S#
      • 1...Re5
        • 2.Sxe5#
      • 1...Sc5
        • 2.Se5#
      • 1...Sd8
        • 2.exd8S#
      • 1...Sf6
        • 2.e8Q#
        • 2.e8B#
      • 1...Sc7
        • 2.e8Q#
        • 2.e8S#
        • 2.e8B#
        • 2.e8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::QAB(C),XR(b)
    • R(b);N_GUARD::S(E),XR(b)
    • S(e);S_CUTR(b)::S(E)
    • S(e);OGATE::PXS(e)=S
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • B(c);OGATE,XS(H)::PXB(c)=S
      • S(g);OGATE::P=S
      • R(b);N_GUARD::S(E),XR(b)
      • S(e);S_CUTR(b)::S(E)
      • S(e);OGATE::PXS(e)=S
      • S(g);OGATE::P=Q
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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).