MESON Chess Problem Database

Problem Display
PID: 16663 (6n1/8/3pp1B1/Nppk2p1/5P2/6K1/4N3/Qn6 w - - 0 1)

Fisher, HF

Chess, 1942

6n1/8/3pp1B1/Nppk2p1/5P2/6K1/4N3/Qn6

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Qd1#
      • 2.Qh1#
    • 1...c4
      • 2.Qd4#
    • 1...gxf4+
      • 2.Sxf4#
  • Tries
    • 1.Qg7?
      • threat
        • 2.Qb7#
      • 1...gxf4+
        • 2.Sxf4#
      • 1...c4
        • 2.Qd4#
      • 1...e5
        • 2.Qf7#
        • 2.Qxg8#
      • 1...Se7!
    • 1.Qxb1?
      • threat
        • 2.Be4#
        • 2.Qd3#
        • 2.Qe4#
        • 2.Qd1#
        • 2.Qh1#
      • 1...c4
        • 2.Qxb5#
      • 1...e5
        • 2.Bf7#
      • 1...Sf6
        • 2.Qd3#
        • 2.Qd1#
      • 1...gxf4+!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qh1#
      • 1...gxf4+
        • 2.Sxf4#
      • 1...c4
        • 2.Qd4#
      • 1...e5
        • 2.Qxg8#
      • 1...Sd2
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...Sf6
        • 2.Qa8#
      • 1...Sh6
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::QAR1(A)
    • P(e);CHECK,XP(D)::S(B),XP(e)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • P(e);CHECK,XP(D)::S(B),XP(e)
        • P(c);N_GUARD::QAR1(A)
      • Refutation
        • S(h);
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(5)
      • Vars
        • P(c);OGATEB::QAR2(A),XP(b)
        • P(g);OGATEB::B(F)
      • Refutation
        • P(e);CHECK,XP(D)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • P(e);CHECK,XP(D)::S(B),XP(e)
      • P(c);N_GUARD::QAR1(A)
      • P(g);OGATEB::QAB(A),XS(h)
      • S(a);N_GUARD::S(B)
      • S(a);N_GUARD::S(B),XS(a)
      • S(h);OGATE::QAB(A)
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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).