MESON Chess Problem Database

Problem Display
PID: 222652 (5K1k/3p1pn1/3np1p1/6N1/5N2/3Q3q/8/8 w - - 0 1)

Eaton Fearn, J

English Mechanic and World of Science, 1884

(First published on Fri Mar 14 1884)

5K1k/3p1pn1/3np1p1/6N1/5N2/3Q3q/8/8

#2

4 + 8

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Se8
      • 2.Qxh3#
    • 1...f5
      • 2.Sxg6#
    • 1...f6
      • 2.Sxg6#
  • Tries
    • 1.Sxf7+?
      • 1...Kh7
        • 2.Qxg6#
      • 1...Sxf7!
  • Keys
    • 1.Qxg6!
      • threat
        • 2.Qxg7#
      • 1...fxg6
        • 2.Sxg6#
      • 1...Qc3
        • 2.Qh7#
        • 2.Qh6#
      • 1...Qh6
        • 2.Qxh6#
      • 1...Qh7
        • 2.Qxh7#
      • 1...Sdf5
        • 2.Sxf7#
      • 1...Sde8
        • 2.Sxf7#
      • 1...Sgf5
        • 2.Qg8#
      • 1...Sh5
        • 2.Qh7#
        • 2.Qh6#
        • 2.Qg8#
      • 1...Sge8
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • S(g);N_GUARD::QAR(A),XQ(a)
    • P(f);N_GUARD::S(B),XP(d)
  • Tries
    • Try
      • S(C);CHECK,XP(f)
      • Vars
        • K(h);P-FLIGHT,P_SPINP(d)::QAB1(A),XP(d)
      • Refutation
        • S(b);XS(C)
  • Actual
    • Q(A);XP(d)
    • Threat
      • QAB1(A),XS(g)
    • Vars
      • P(f);XQ(A)::S(B),XP(f)
      • Q(a);N_GUARD::QAR2(A),XQ(a)
      • Q(a);N_GUARD::QAR1(A),XQ(a)
      • S(b);N_GUARD::S(C),XP(f)
      • S(g);OGATE::QAR1(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).