Problem Display
PID: 257595 (7k/7r/8/K5R1/8/6pR/5prN/6bQ w - - 0 1)

Degener, Udo

Troll, 2021

(First published on Wed Feb 3 2021)

7k/7r/8/K5R1/8/6pR/5prN/6bQ

#2

5 + 6


SOLUTION


  • SOUND
  • Sets
    • 1...Rxh2
      • 2.Qa8#
    • 1...Rh4
      • 2.Rxh4#
    • 1...Rh5
      • 2.Rhxh5#
    • 1...Rh6
      • 2.Rxh6#
    • 1...Bxh2
      • 2.Qa1#
  • Tries
    • 1.Sf1?
      • threat
        • 2.Rxh7#
      • 1...Rxh3
        • 2.Qxh3#
      • 1...Rh4
        • 2.Rxh4#
      • 1...Rh5
        • 2.Rhxh5#
      • 1...Rh6
        • 2.Rxh6#
      • 1...Rh2
        • 2.Qa8#
      • 1...Bh2!
    • 1.Sf3?
      • threat
        • 2.Rxh7#
      • 1...Rxh3
        • 2.Qxh3#
      • 1...Rh4
        • 2.Rxh4#
      • 1...Rh5
        • 2.Rhxh5#
      • 1...Rh6
        • 2.Rxh6#
      • 1...Bh2
        • 2.Qa1#
      • 1...Rh2!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Rxh7#
      • 1...Rxh3
        • 2.Qxh3#
      • 1...Rh4
        • 2.Rxh4#
      • 1...Rh5
        • 2.Rhxh5#
      • 1...Rh6
        • 2.Rxh6#
      • 1...Rh2
        • 2.Qa8#
      • 1...Bh2
        • 2.Qa1#

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE,XS(B)::QAB1(A)
    • R(e);OGATEB::R(C),XR(e)
    • R(e);OGATEB,P_PINR(E)::R(C),XR(e)
    • B(a);OGATE,XS(B)::QAB(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • R1(C),XR(e)
      • Vars
        • R(e);OGATE,XR(C)::QAR(A),XR(e)
        • R(e);OGATEB::R(C),XR(e)
        • R(e);OGATEB,P_PINR(E)::R(C),XR(e)
        • R(c);OGATE::QAB1(A)
      • Refutation
        • B(a);
    • Try
      • S(B);
      • Threat
        • R1(C),XR(e)
      • Vars
        • R(e);OGATE,XR(C)::QAR(A),XR(e)
        • R(e);OGATEB::R(C),XR(e)
        • R(e);OGATEB,P_PINR(E)::R(C),XR(e)
        • B(a);OGATE::QAB(A)
      • Refutation
        • R(c);
  • Actual
    • S(B);
    • Threat
      • R1(C),XR(e)
    • Vars
      • R(e);OGATE,XR(C)::QAR(A),XR(e)
      • R(e);OGATEB::R(C),XR(e)
      • R(e);OGATEB,P_PINR(E)::R(C),XR(e)
      • R(c);OGATE::QAB1(A)
      • B(a);OGATE::QAB(A)


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).