MESON Chess Problem Database

Problem Display
PID: 52578 (kr6/BR6/P7/7K/8/8/8/Q7 w - - 0 1)

Sonnenfeld, Felix Alexander

Source?, 0000

kr6/BR6/P7/7K/8/8/8/Q7

#2

5 + 2

5309 O Mosqueteiro do Rei 1997
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rh8+
      • 2.Qxh8#
  • Tries
    • 1.Qh8?
      • threat
        • 2.Qxb8#
      • 1...Rc8
        • 2.Qxc8#
      • 1...Rd8
        • 2.Qxd8#
      • 1...Re8
        • 2.Qxe8#
      • 1...Rf8
        • 2.Qxf8#
      • 1...Rg8
        • 2.Qxg8#
      • 1...Rxh8+!
  • Keys
    • 1.Qh1!
      • 1...Rh8+
        • 2.Rh7#
      • 1...Rxb7
        • 2.Qxb7#
      • 1...Rc8
        • 2.Rc7#
      • 1...Rd8
        • 2.Rd7#
      • 1...Re8
        • 2.Re7#
      • 1...Rf8
        • 2.Rf7#
      • 1...Rg8
        • 2.Rg7#

Anticipated by 6295(1928), 24909(1928), 205822(1932), 263960(1939), 16408(1940), 51226(1955), 77962(1955), 261888(1957), 58714(1960), 210889(1985), 240458(1992)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(b);CHECK,OGATEB::QAB1(A),XR(b)
  • Tries
    • Try
      • Q(A);P_PINR(b)
      • Threat
        • QAR1(A),XR(b)
      • Vars
        • R(b);OGATEB::QAR2(A),XR(b)
        • R(b);OGATEB::QAR(A),XR(b)
      • Refutation
        • R(b);CHECK,N_SPINR(b),XQ(A)
  • Actual
    • Q(A);
    • Vars
      • R(b);CHECK,N_GUARD::QAB(A)+R(E)
      • R(b);OGATE,P_SPINR(b),XR(E)::QAB1(A),XR(b)
      • R(b);N_GUARD::QAB(A)+R(E)
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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).