MESON Chess Problem Database

Problem Display
PID: 196538 (Q1K4b/1r5r/3pN2p/1PBk3P/b1R2PN1/1P6/2B1R3/8 w - - 0 1)

Ruonala, Lauri Armas

Stella Polaris, 1973

Q1K4b/1r5r/3pN2p/1PBk3P/b1R2PN1/1P6/2B1R3/8

#2

12 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc7+
      • 2.Sxc7#
    • 1...Rg7
      • 2.Sf6#
      • 2.Rd4#
    • 1...Bd4
      • 2.Rxd4#
    • 1...Bf6
      • 2.Sxf6#
    • 1...Bg7
      • 2.Sc7#
      • 2.Qxb7#
  • Keys
    • 1.Sg7!
      • threat
        • 2.Se3#
        • 2.Sf6#
        • 2.Be4#
        • 2.Rd2#
        • 2.Qxb7#
      • 1...Rxg7
        • 2.Sf6#
      • 1...Bxb3
        • 2.Se3#
      • 1...Bxb5
        • 2.Be4#
      • 1...Bxg7
        • 2.Qxb7#
      • 1...dxc5
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(f);CHECK,N_GUARD::S(J),XR(f)
    • B(g);N_GUARD::R1(D),XB(g)
    • B(g);N_GUARD::S(F),XB(g)
  • Actual
    • S(J);
    • Threat
      • DUALS(5)
    • Vars
      • R(f);XS(J)::S(F)
      • B(a);XP(C)::S(F)
      • B(a);XP(G)::B(A)
      • B(g);XS(J)::QAB(K),XR(e)
      • P(c);XB(H)::R(B)
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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).