MESON Chess Problem Database

Problem Display
PID: 79980 (1b6/7N/4p3/5k1P/8/5K2/8/7Q w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 2008

1b6/7N/4p3/5k1P/8/5K2/8/7Q

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qb1#
      • 2.Qh3#
    • 1...e5
      • 2.Qh3#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qf6#
      • 1...Be5
        • 2.Qb1#
      • 1...e5!
    • 1.Qh4?
      • threat
        • 2.Qg5#
        • 2.Qf6#
        • 2.Qe4#
      • 1...Bf4
        • 2.Qf6#
        • 2.Qxf4#
      • 1...Be5
        • 2.Qg5#
        • 2.Qh3#
        • 2.Qe4#
        • 2.Qg4#
      • 1...e5
        • 2.Qf6#
        • 2.Qh3#
        • 2.Qg4#
      • 1...Ke5!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qg5#
      • 1...Ke5
        • 2.Qc5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...e5
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(c);SBLOCK::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(a);P-FLIGHT::QAR2(A)
      • B(c);N_GUARD::QAR1(A),XB(c)
      • P(b);OGATEB,SBLOCK::QAB(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).