MESON Chess Problem Database

Problem Display
PID: 153427 (N7/1qR5/kP5Q/8/1K6/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2012

N7/1qR5/kP5Q/8/1K6/8/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Ra7#
    • 1...Qg2
      • 2.Ra7#
    • 1...Qf3
      • 2.Ra7#
    • 1...Qd5
      • 2.Ra7#
    • 1...Qc6
      • 2.Ra7#
    • 1...Qc8
      • 2.Ra7#
    • 1...Qxb6+
      • 2.Qxb6#
    • 1...Qa7
      • 2.Rxa7#
      • 2.bxa7#
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qxb7#
        • 2.Qc4#
      • 1...Qxb6+
        • 2.Qxb6#
      • 1...Qxc6
        • 2.Ra7#
      • 1...Qxa8
        • 2.Qb5#
      • 1...Qxc7
        • 2.Sxc7#
      • 1...Qc8
        • 2.Ra7#
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qc4#
      • 1...Qa7
        • 2.Rxa7#
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qc4#
        • 2.bxa7#
      • 1...Qb8
        • 2.Qa4#
        • 2.Qb5#
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_PINP(B),OGATE::R1(D)
    • Q(b);CHECK,OGATE,P_SPINQ(b),XP(B)::QAR1(C),XQ(b)
  • Actual
    • Q(C);
    • Threat
      • DUALS(4)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XP(B)::QAR1(C),XQ(b)
      • Q(b);N_PINP(B),OGATE,XQ(C)::R1(D)
      • Q(b);N_PINP(B),XS(E)::QAB1(C)
      • Q(b);N_PINP(B),XR(D)::S(E),XQ(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).