Problem Display
PID: 33832 (8/2pp4/3p4/3k1K2/P7/1PP5/4p3/2b3Q1 w - - 0 1)

Howard, David M

Problem Observer, 1991

8/2pp4/3p4/3k1K2/P7/1PP5/4p3/2b3Q1

#3

5 + 6


SOLUTION


  • SOUND
  • Sets
    • 1...e1B
      • 2.Qf1
        • threat
          • 3.Qc4#
        • 2...Kc5
          • 3.Qb5#
        • 2...Kc6
          • 3.Qb5#
        • 2...c5
          • 3.Qg2#
          • 3.Qh1#
          • 3.Qf3#
    • 1...c5
      • 2.Qh1#
      • 2.Qg2#
    • 1...c6
      • 2.Qd4#
      • 2.c4#
  • Tries
    • 1.Qb6?
      • threat
        • 2.c4#
      • 1...c5
        • 2.Qb7#
      • 1...cxb6!
    • 1.Qg4?
      • threat
        • 2.Qc4#
      • 1...Kc5
        • 2.Qb4+
          • 2...Kd5
            • 3.Qc4#
          • 2...Kc6
            • 3.Qb5#
      • 1...Bf4
        • 2.Qxe2
          • threat
            • 3.Qc4#
          • 2...Kc5
            • 3.Qb5#
          • 2...Kc6
            • 3.Qb5#
          • 2...c5
            • 3.Qf3#
            • 3.Qg2#
            • 3.Qe4#
      • 1...Kc6!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qa5+
          • 2...Kc6
            • 3.Qb5#
          • 2...c5
            • 3.Qa8#
        • 2.Qa6
          • threat
            • 3.Qc4#
          • 2...Kc5
            • 3.Qb5#
          • 2...c5
            • 3.Qb7#
            • 3.Qa8#
        • 2.Qxc7
          • threat
            • 3.Qc4#
      • 1...Kc6
        • 2.Qa6+
          • 2...Kc5
            • 3.Qb5#
          • 2...Kd5
            • 3.Qc4#
      • 1...e1Q
        • 2.Qa5+
          • 2...Kc6
            • 3.Qb5#
          • 2...c5
            • 3.Qa8#
      • 1...e1R
        • 2.Qa5+
          • 2...Kc6
            • 3.Qb5#
          • 2...c5
            • 3.Qa8#
      • 1...Ba3
        • 2.Qxc7
          • threat
            • 3.Qc4#
          • 2...Bc5
            • 3.Qb7#
      • 1...Be3
        • 2.Qxc7
          • threat
            • 3.Qc4#
          • 2...Bc5
            • 3.Qb7#

FEATURES


NOT CLASSIFIED


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).