MESON Chess Problem Database

Problem Display
PID: 185371 (2BbR2K/1p4Q1/5p2/2pnnp1N/2P1k2p/qN6/1PP1brP1/2B1R3 w - - 0 1)

Hjelle, David

diagrammes, 1974

2BbR2K/1p4Q1/5p2/2pnnp1N/2P1k2p/qN6/1PP1brP1/2B1R3

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg2
      • 2.Qxg2#
    • 1...Se7
      • 2.Sxf6#
    • 1...h3
      • 2.Sg3#
  • Tries
    • 1.Rxe2+?
      • 1...Se3
        • 2.Bxb7#
        • 2.Rxe3#
        • 2.Qxb7#
      • 1...Rxe2!
    • 1.Qg4+?
      • 1...Rf4
        • 2.Bxf5#
      • 1...Sf4
        • 2.Bxf5#
        • 2.Bxb7#
        • 2.Qxf5#
      • 1...f4
        • 2.Bf5#
        • 2.Qf5#
      • 1...fxg4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qxd5#
      • 1...Sc3
        • 2.Qd3#
      • 1...Se3
        • 2.Sd2#
      • 1...Sb4
        • 2.Sxc5#
      • 1...Sf4
        • 2.Qxf5#
      • 1...Sb6
        • 2.Qd3#
      • 1...Sc7
        • 2.Qd3#
      • 1...Se7
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • R(b);OGATE,XP(E)::QAB(I),XR(b)
    • S(g);N_GUARD,N_SPINS(h),S_CUTB(l)::S(H),XP(j)
    • P(e);N_GUARD::S(H)
  • Tries
    • Try
      • R(B);CHECK,XB(a)
      • Refutation
        • R(b);XR(B)
    • Try
      • Q(I);CHECK
      • Vars
        • R(b);P_SPINR(b)::B(J),XP(i)
      • Refutation
        • P(i);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XS(g)
    • Vars
      • S(g);OGATE::QAB1(I)
      • S(g);N_SPINB(a),SBLOCK::S(F)
      • S(g);S_CUTQ(c)::S(F),XP(f)
      • S(g);S_CUTR(b)::QAB1(I),XP(i)
      • S(g);N_GUARD,N_SPINS(h),S_CUTB(l)::S(H),XP(j)
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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).