MESON Chess Problem Database

Problem Display
PID: 76193 (7B/7Q/8/p7/8/2K5/1r6/kB6 w - - 0 1)

Froberg, Johan Hilding Laurentius

Abo Underrattelsers Schacktidning, 1943

7B/7Q/8/p7/8/2K5/1r6/kB6

#2

4 + 3

145 StrateGems 2007
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2+
      • 2.Kxc2#
    • 1...Rd2
      • 2.Kxd2#
    • 1...Rb3+
      • 2.Kxb3#
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qxb2#
      • 1...Rxc2+
        • 2.Kxc2#
      • 1...Rb3+
        • 2.Kxb3#
      • 1...Rxb1
        • 2.Qa4#
      • 1...Ra2
        • 2.Qxa2#
      • 1...Rb4
        • 2.Qa2#
      • 1...Rb5
        • 2.Qa2#
      • 1...Rb6
        • 2.Qa2#
      • 1...Rb7
        • 2.Qa2#
      • 1...Rb8
        • 2.Qa2#

This anticipates 167090(1979)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(b);CHECK::B(D)+K(B),XR(b)
    • R(b);::B(D)+K(B),XR(b)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XR(b)
    • Vars
      • R(b);CHECK,XQ(C)::B(D)+K(B),XR(b)
      • R(b);CHECK::B(D)+K(B),XR(b)
      • R(b);N_GUARD,SBLOCK,XB(A)::QAR(C)
      • R(b);OGATE::QAR1(C),XR(b)
      • R(b);OGATE::QAR1(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).