MESON Chess Problem Database

Problem Display
PID: 246401 (8/4RpK1/Nn1k1B2/p2p4/2nN4/p5RB/2r4Q/1q2r3 w - - 0 1)

Hjelle, David

Sjakk-Nytt, 1947

8/4RpK1/Nn1k1B2/p2p4/2nN4/p5RB/2r4Q/1q2r3

#2

8 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Rge3#
    • 1...Se3
      • 2.Rg2#
    • 1...Sa4
      • 2.Rd7#
    • 1...Sd7
      • 2.Rxd7#
    • 1...Sa8
      • 2.Rd7#
    • 1...Sc8
      • 2.Rd7#
  • Tries
    • 1.Rge3+?
      • 1...Se5
        • 2.Qxe5#
      • 1...Rxh2!
  • Keys
    • 1.Rc7!
      • threat
        • 2.Rc6#
      • 1...Qb5
        • 2.Sxb5#
      • 1...Re6
        • 2.Sf5#
      • 1...Sb2
        • 2.Sb5#
      • 1...Sd2
        • 2.Re3#
      • 1...Se3
        • 2.Rg2#
      • 1...Se5
        • 2.Be7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • S(e);N_GUARD,S_CUTR(c)::QAB(A)+R(B)
    • S(e);N_GUARD,S_CUTR(b)::QAB(A)+R(B)
    • S(h);N_GUARD::R1(G)
    • S(h);N_GUARD::R1(G),XS(h)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB1(A),XS(e)
      • Refutation
        • R(c);XQ(A)
  • Actual
    • R(G);
    • Threat
      • R1(G)
    • Vars
      • Q(a);N_GUARD::S(D),XQ(a)
      • R(b);SBLOCK::S(D)
      • S(e);S_CUTQ(a)::S(D)
      • S(e);N_GUARD,S_CUTR(c)::QAB(A)+R(B)
      • S(e);N_GUARD,S_CUTR(b)::QAB(A)+R(B)
      • S(e);SBLOCK,S_CUTR(b)::B(F)
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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).