MESON Chess Problem Database

Problem Display
PID: 16408 (Q7/8/8/8/8/B6K/BR6/kr6 w - - 0 1)

Wenman, Francis Percival (aka Percy Wenman)

Fifty Two-Move Problems, 1940

Q7/8/8/8/8/B6K/BR6/kr6

#2

5 + 2

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1+
      • 2.Qxh1#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qxb1#
      • 1...Rc1
        • 2.Qxc1#
      • 1...Rd1
        • 2.Qxd1#
      • 1...Re1
        • 2.Qxe1#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Rg1
        • 2.Qxg1#
      • 1...Rxh1+!
  • Keys
    • 1.Qh8!
      • 1...Rh1+
        • 2.Rh2#
      • 1...Rxb2
        • 2.Qxb2#
      • 1...Rc1
        • 2.Rc2#
      • 1...Rd1
        • 2.Rd2#
      • 1...Re1
        • 2.Re2#
      • 1...Rf1
        • 2.Rf2#
      • 1...Rg1
        • 2.Rg2#

Anticipated by 6295(1928), 24909(1928), 205822(1932), 263960(1939)

This anticipates 52578(0000), 51226(1955), 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(E),XR(b)
  • Tries
    • Try
      • Q(E);P_PINR(b)
      • Threat
        • QAR1(E),XR(b)
      • Vars
        • R(b);OGATEB::QAR2(E),XR(b)
        • R(b);OGATEB::QAR(E),XR(b)
      • Refutation
        • R(b);CHECK,N_SPINR(b),XQ(E)
  • Actual
    • Q(E);
    • Vars
      • R(b);CHECK,N_GUARD::QAB(E)+R(B)
      • R(b);OGATE,P_SPINR(b),XR(B)::QAB1(E),XR(b)
      • R(b);N_GUARD::QAB(E)+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).