MESON Chess Problem Database

Problem Display
PID: 72673 (8/8/2Q2K1k/5p2/8/7p/7r/7R w - - 0 1)

Ojanen, Antti Gottfried

2nd HM., Abo Underrattelsers Schacktidning, 1942

8/8/2Q2K1k/5p2/8/7p/7r/7R

#2

3 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Rxh3#
    • 1...Rb2
      • 2.Rxh3#
    • 1...Rc2
      • 2.Rxh3#
    • 1...Rd2
      • 2.Rxh3#
    • 1...Re2
      • 2.Rxh3#
    • 1...Rf2
      • 2.Rxh3#
    • 1...Rg2
      • 2.Rxh3#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qg6#
        • 2.Qh8#
      • 1...Rg2
        • 2.Rxh3#
        • 2.Qh8#
      • 1...Kh7!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qg6#
      • 1...Kh5
        • 2.Qg5#
      • 1...Kh7
        • 2.Qg7#
      • 1...Rxg2
        • 2.Rxh3#
      • 1...hxg2
        • 2.Rxh2#

This anticipates 47809(1982)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(a);OGATE,P_SPINP(b)::R(A),XP(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(d);P-FLIGHT::QAR1(B)
      • R(a);OGATE,P_SPINP(b),XQ(B)::R(A),XP(b)
      • P(b);OGATEB,P_SPINR(a),XQ(B)::R(A),XR(a)
HTML5 logo

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).