MESON Chess Problem Database

Problem Display
PID: 74857 (2Q5/8/8/kN6/8/7K/3qB3/4B3 w - - 0 1)

Lincoln, Robert A

Problem Observer, 2007

2Q5/8/8/kN6/8/7K/3qB3/4B3

#2

5 + 2

5454 Near Snap 2008

SOLUTION

  • SOUND
  • Tries
    • 1.Bxd2+?
      • 1...Ka4
        • 2.Qc2#
        • 2.Qc4#
      • 1...Kb6!
    • 1.Qa6+?
      • 1...Kb4
        • 2.Qa3#
      • 1...Kxa6!
    • 1.Qa8+?
      • 1...Kb4
        • 2.Qa3#
      • 1...Kb6!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Sc3#
      • 1...Qc3+
        • 2.Sxc3#
      • 1...Ka4
        • 2.Qa3#
      • 1...Ka6
        • 2.Qa7#
      • 1...Qb4
        • 2.Qa7#

Anticipated by 10699(1967), 10701(1967-1968)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);CHECK,XQ(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINQ(a),P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);N_SPINQ(a),S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAR(E)+S(D)
    • Vars
      • Q(a);CHECK::QAR(E)+S(D),XQ(a)
      • K(b);N_SPINQ(a),P-FLIGHT::QAR1(E)
      • Q(a);::QAR2(E)
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).