MESON Chess Problem Database

Problem Display
PID: 21238 (6r1/5Qpk/2p3R1/8/8/8/2K4p/8 w - - 0 1)

Wurzburg, Otto

1st Prize, Pittsburgh Gazette-Times, 1917

6r1/5Qpk/2p3R1/8/8/8/2K4p/8

#2

3 + 5

5064 100 Years of the American Two-move Chess Problem 1962
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxg7#
    • 1...Rb8
      • 2.Qxg7#
    • 1...Rc8
      • 2.Qxg7#
    • 1...Rd8
      • 2.Qxg7#
    • 1...Re8
      • 2.Qxg7#
    • 1...Rf8
      • 2.Qxg7#
    • 1...Rh8
      • 2.Qxg7#
  • Tries
    • 1.Rxg7+?
      • 1...Kh6
        • 2.Qg6#
      • 1...Kh8
        • 2.Rh7#
        • 2.Rxg8#
        • 2.Qxg8#
      • 1...Rxg7!
  • Keys
    • 1.Rg1!
      • threat
        • 2.Qh5#
      • 1...Kh6
        • 2.Qg6#
      • 1...Kh8
        • 2.Qh5#
      • 1...h1Q
        • 2.Rxh1#
      • 1...h1R
        • 2.Rxh1#
      • 1...Ra8
        • 2.Qxg7#
      • 1...Rb8
        • 2.Qxg7#
      • 1...Rc8
        • 2.Qxg7#
      • 1...Rd8
        • 2.Qxg7#
      • 1...Re8
        • 2.Qxg7#
      • 1...Rf8
        • 2.Qxg7#
      • 1...Rh8
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(e);N_GUARD,SBLOCK::QAR1(C),XP(c)
    • R(e);N_GUARD::QAR1(C),XP(c)
  • Tries
    • Try
      • R(B);CHECK,XP(c)
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • R(e);P_SPINR(e),XR(B)
  • Actual
    • R(B);
    • Threat
      • QAR2(C)
    • Vars
      • K(d);N_SPINP(c),P-FLIGHT::QAR1(C)
      • K(d);N_SPINP(c),P-FLIGHT::QAR(C)
      • P(a);OGATEB::R(B),XQ(a)
      • P(a);OGATEB::R(B),XR(a)
      • R(e);N_GUARD,SBLOCK::QAR1(C),XP(c)
      • R(e);N_GUARD::QAR1(C),XP(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).