MESON Chess Problem Database

Problem Display
PID: 224214 (5b2/2K2k2/5p2/5N2/8/8/8/4R1Q1 w - - 0 1)

Thielemann, Alfred Rudolf

Nordstjernen, 1888

5b2/2K2k2/5p2/5N2/8/8/8/4R1Q1

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ba3
      • 2.Qg7#
    • 1...Bb4
      • 2.Qg7#
    • 1...Bc5
      • 2.Qg7#
    • 1...Bg7
      • 2.Qxg7#
  • Tries
    • 1.Kd7?
      • 1...Ba3
        • 2.Qg7#
      • 1...Bb4
        • 2.Qg7#
      • 1...Bc5
        • 2.Qg7#
      • 1...Bd6
        • 2.Qg7#
      • 1...Be7
        • 2.Qg7#
      • 1...Bg7
        • 2.Qxg7#
      • 1...Bh6!
  • Keys
    • 1.Re8!
      • 1...Bd6+
        • 2.Sxd6#
      • 1...Kxe8
        • 2.Qg6#
      • 1...Be7
        • 2.Qg8#
      • 1...Ba3
        • 2.Qg8#
      • 1...Bb4
        • 2.Qg8#
      • 1...Bc5
        • 2.Qg8#
      • 1...Bh6
        • 2.Sd6#
        • 2.Qg8#
      • 1...Bg7
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD::QAR1(B)
    • B(c);N_GUARD::QAR1(B),XB(c)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • B(c);N_GUARD::QAR1(B)
        • B(c);N_GUARD::QAR1(B),XB(c)
      • Refutation
        • B(c);
  • Actual
    • R(A);
    • Vars
      • B(c);CHECK,N_GUARD::S(C),XB(c)
      • K(b);S_FLIGHT,XR(A)::QAB(B)
      • B(c);::QAB1(B)
      • B(c);N_GUARD::S(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).