Meson Chess Problem Database

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Problem Display

PID: 102637 (8/8/8/8/rP6/1Q6/5pK1/k1N5 w - - 0 1)

Froberg, Johan Hilding Laurentius

Europe Echecs, 1969

8/8/8/8/rP6/1Q6/5pK1/k1N5

#3

4 + 3

6490	yacpdb	2009
3713	Snap	2018

SOLUTION

SOUND
Sets
- 1...Ra2
  - 2.Qxa2#
- 1...Rxb4
  - 2.Qa2#
Keys
- 1.Kf1!
  - 1...Ra3
    - 2.Qc2
      - 2...Ra2
        3.Sb3#
        3.Qxa2#
      - 2...Rb3
        3.Sxb3#
        3.Qa2#
      - 2...Rc3
        3.Qa2#
      - 2...Rd3
        3.Qa2#
      - 2...Re3
        3.Qa2#
      - 2...Rf3
        3.Qa2#
      - 2...Rg3
        3.Qa2#
      - 2...Rh3
        3.Qa2#
      - 2...Ra4
        3.Sb3#
      - 2...Ra5
        3.Sb3#
      - 2...Ra6
        3.Sb3#
      - 2...Ra7
        3.Sb3#
      - 2...Ra8
        3.Sb3#
  - 1...Ra5
    - 2.Sd3
      - threat
        3.Qb2#
      - 2...Ra2
        3.Qd1#
  - 1...Ra6
    - 2.Sd3
      - threat
        3.Qb2#
      - 2...Ra2
        3.Qd1#
  - 1...Ra7
    - 2.Sd3
      - threat
        3.Qb2#
      - 2...Ra2
        3.Qd1#
  - 1...Ra8
    - 2.Sd3
      - threat
        3.Qb2#
      - 2...Ra2
        3.Qd1#

This anticipates 171519(1987)

FEATURES

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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).