MESON Chess Problem Database

Problem Display
PID: 142770 (R1N1B2k/7p/4N3/8/3q4/4pp1p/1rn5/B5QK w - - 0 1)

Hermanson, Halvar

US Problem Bulletin, 1963

R1N1B2k/7p/4N3/8/3q4/4pp1p/1rn5/B5QK

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Qg7#
    • 1...Qb6
      • 2.Qg7#
    • 1...Qg7
      • 2.Qxg7#
    • 1...Qd2
      • 2.Qg7#
    • 1...Qd3
      • 2.Qg7#
    • 1...Qa4
      • 2.Qg7#
    • 1...Qb4
      • 2.Qg7#
    • 1...Qc4
      • 2.Qg7#
    • 1...Qe4
      • 2.Qg7#
    • 1...Qf4
      • 2.Qg7#
    • 1...Qh4
      • 2.Qg7#
    • 1...Qd5
      • 2.Qg7#
    • 1...Qd6
      • 2.Qg7#
    • 1...Qd8
      • 2.Qg7#
  • Tries
    • 1.Bf7?
      • threat
        • 2.Qg8#
      • 1...Qg7
        • 2.Qxg7#
      • 1...Qd1
        • 2.Sd6#
      • 1...Qd8
        • 2.Qg7#
      • 1...Rb1
        • 2.Sb6#
      • 1...Qg4!
  • Keys
    • 1.Se7!
      • threat
        • 2.Qg8#
      • 1...Qg7
        • 2.Qxg7#
      • 1...Qd1
        • 2.Bd7#
      • 1...Qg4
        • 2.Bg6#
      • 1...Rb1
        • 2.Bb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • Q(f);N_GUARD,P_SPINR(a)::QAB1(B)
    • Q(f);N_GUARD::QAB1(B),XQ(f)
  • Tries
    • Try
      • B(G);
      • Threat
        • QAR1(B)
      • Vars
        • Q(f);N_GUARD::QAB1(B),XQ(f)
        • Q(f);P_PINQ(B),P_SPINR(a)::R(E)+S(F)
        • Q(f);N_GUARD,P_SPINR(a)::QAB1(B)
        • R(a);P_PINQ(B),P_SPINQ(f)::R(E)+S(F)
      • Refutation
        • Q(f);P_SPINR(a)
  • Actual
    • S(F);
    • Threat
      • QAR1(B)
    • Vars
      • Q(f);N_GUARD::QAB1(B),XQ(f)
      • Q(f);P_PINQ(B),P_SPINR(a)::R(E)+B(G)
      • Q(f);N_GUARD,P_SPINR(a)::R(E)+B(G)
      • R(a);P_PINQ(B),P_SPINQ(f)::R(E)+B(G)
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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).