MESON Chess Problem Database

Problem Display
PID: 238086 (6N1/6p1/2p3p1/5pkn/KQ4r1/p3p2R/4N3/5rR1 w - - 0 1)

Hermanson, Halvar

Norsk Sjakkblad, 1953

6N1/6p1/2p3p1/5pkn/KQ4r1/p3p2R/4N3/5rR1

#2

6 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg1
      • 2.Qh4#
    • 1...Rg2
      • 2.Qh4#
    • 1...Rg3
      • 2.Qh4#
    • 1...Sf4
      • 2.Qe7#
    • 1...f4
      • 2.Qc5#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Se6#
      • 1...Sxf4
        • 2.Qe7#
      • 1...Rxf4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Se6#
      • 1...Kf4
        • 2.Sf3#
      • 1...Sf4
        • 2.Qe7#
      • 1...f4
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(d);N_PINQ(E),N_SPINR(d),XR(A)::QAB1(E)
    • R(d);N_PINQ(E)::QAB1(E)
    • S(g);N_PINQ(E)::QAB(E)
    • P(e);N_PINQ(E)::QAR(E)
  • Tries
    • Try
      • S(B);N_SPINQ(E)
      • Threat
        • S(B)
      • Vars
        • S(g);N_GUARD,SBLOCK,XS(B)::QAB(E)
      • Refutation
        • R(a);P_PINQ(E),XS(B)
  • Actual
    • S(B);N_SPINQ(E)
    • Threat
      • S(B)
    • Vars
      • K(f);N_SPINR(d),S_FLIGHT::QAR(E)+S(B)
      • S(g);N_GUARD,SBLOCK::QAB(E)
      • P(e);OGATEB,SBLOCK::QAR(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).