MESON Chess Problem Database

Problem Display
PID: 77644 (6Q1/8/8/8/4p1N1/1K3k2/4N3/7R w - - 0 1)

McWilliam, Robert C

The Problemist, 1988

6Q1/8/8/8/4p1N1/1K3k2/4N3/7R

#2

5 + 2

15393 McWilliam Scrapbook 2015
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qf7+?
      • 1...Kg2
        • 2.Rh2#
        • 2.Qf1#
      • 1...Kxg4
        • 2.Qh5#
        • 2.Qf4#
      • 1...Kxe2!
    • 1.Qf8+?
      • 1...Kg2
        • 2.Rh2#
        • 2.Qf1#
      • 1...Kxg4
        • 2.Qf4#
      • 1...Kxe2!
  • Keys
    • 1.Qd5!
      • 1...Kxe2
        • 2.Qd1#
      • 1...Kg2
        • 2.Qxe4#
      • 1...Kxg4
        • 2.Qh5#

Anticipated by 80435(1962), 209096(1988)

This anticipates 198435(1997)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(D)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
  • Actual
    • Q(E);P_PINP(b)
    • Vars
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(B)::QAB1(E)
      • K(a);S_FLIGHT::QAB(E),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(D)::QAB1(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).