MESON Chess Problem Database

Problem Display
PID: 205822 (Q4BBk/6Rr/8/8/8/8/8/4K3 w - - 0 1)

Bohm, Ferenc

Brisbane Courier, 1932

Q4BBk/6Rr/8/8/8/8/8/4K3

#2

5 + 2

5454 Near Snap 2020
15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1+
      • 2.Qxh1#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qxh7#
      • 1...Rh2
        • 2.Qxh2#
      • 1...Rh3
        • 2.Qxh3#
      • 1...Rh4
        • 2.Qxh4#
      • 1...Rh5
        • 2.Qxh5#
      • 1...Rh6
        • 2.Qxh6#
      • 1...Rxh1+!
  • Keys
    • 1.Qa1!
      • 1...Rh1+
        • 2.Rg1#
      • 1...Rxg7
        • 2.Qxg7#
      • 1...Rh2
        • 2.Rg2#
      • 1...Rh3
        • 2.Rg3#
      • 1...Rh4
        • 2.Rg4#
      • 1...Rh5
        • 2.Rg5#
      • 1...Rh6
        • 2.Rg6#

Anticipated by 6295(1928), 24909(1928)

This anticipates 52578(0000), 263960(1939), 16408(1940), 51226(1955), 77962(1955), 58714(1960), 210889(1985), 240458(1992)

FEATURES

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