MESON Chess Problem Database

Problem Display
PID: 208202 (3R4/7k/p3Kn1p/5Pb1/Q3B3/8/8/8 w - - 0 1)

Stein, Julius

Dubuque Chess Journal, 1875

3R4/7k/p3Kn1p/5Pb1/Q3B3/8/8/8

#2

5 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.f6#
    • 1...Sd5
      • 2.f6#
    • 1...Sh5
      • 2.f6#
    • 1...Sd7
      • 2.f6#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qe7#
        • 2.Qh8#
      • 1...Kg7
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qe7#
        • 2.Qh8#
      • 1...Sxe4
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qg8#
        • 2.Qh8#
      • 1...Sg8
        • 2.Qxg8#
      • 1...h5
        • 2.Qg6#
        • 2.Qh8#
      • 1...Sg4
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qg8#
        • 2.Qh8#
        • 2.f6#
      • 1...Sd5
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qg8#
        • 2.Qh8#
        • 2.f6#
      • 1...Sh5
        • 2.Qg6#
        • 2.Qg8#
        • 2.Qh8#
        • 2.f6#
      • 1...Sd7
        • 2.Qg6#
        • 2.Qf7#
        • 2.Qg8#
        • 2.Qh8#
        • 2.f6#
      • 1...Sxe8!
  • Keys
    • 1.Qd7+!
      • 1...Sxd7
        • 2.f6#

This is a version of 208196

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(c);OGATE::B(B)+P(C)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(4)
      • Vars
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • S(c);XQ(A)
  • Actual
    • Q(A);CHECK
    • Vars
      • S(c);OGATE,XQ(A)::B(B)+P(C)
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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).