MESON Chess Problem Database

Problem Display
PID: 200239 (5r2/2pPR3/2p1Kpp1/3P1P2/2pN2p1/2N1krQ1/2P2p2/1b1R3B w - - 0 1)

Albarda, Johannes

Het Parool, 1978

5r2/2pPR3/2p1Kpp1/3P1P2/2pN2p1/2N1krQ1/2P2p2/1b1R3B

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rf7
      • 2.Kxf7#
    • 1...Ra8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Rb8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Rc8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Rd8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Rg8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Rh8
      • 2.Kxf6#
      • 2.Kf7#
    • 1...Bxc2
      • 2.Sxc2#
    • 1...cxd5
      • 2.Kxd5#
    • 1...gxf5
      • 2.Sxf5#
  • Tries
    • 1.dxc6?
      • threat
        • 2.Kd5#
      • 1...Rxg3
        • 2.Sd5#
      • 1...Bxc2
        • 2.Sxc2#
      • 1...Rf7
        • 2.Kxf7#
      • 1...Re8!
  • Keys
    • 1.fxg6!
      • threat
        • 2.Sf5#
      • 1...Rxg3
        • 2.Kf5#
      • 1...Bxc2
        • 2.Sxc2#
      • 1...f5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(k);::R(K)+K(I),XR(k)
    • B(a);XP(C)::S(F),XB(a)
    • P(g);XP(G)::R(K)+K(I),XP(g)
    • P(i);XP(H)::S(F),XP(i)
  • Tries
    • Try
      • P(G);XP(g)
      • Threat
        • R(K)+K(I)
      • Vars
        • R(d);N_SPINR(d),XQ(E)::S(D)
        • B(a);XP(C)::S(F),XB(a)
        • R(k);::R(K)+K(I),XR(k)
      • Refutation
        • R(k);P_PINR(K)
  • Actual
    • P(H);XP(i)
    • Threat
      • S(F)
    • Vars
      • R(d);N_SPINR(d),XQ(E)::R(K)+K(I)
      • B(a);XP(C)::S(F),XB(a)
      • P(h);N_GUARD::QAR2(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).