MESON Chess Problem Database

Problem Display
PID: 15733 (8/N7/pr6/3B4/k7/2QK4/8/8 w - - 0 1)

Lincoln, Robert A

Newark Star-Ledger, 1987

8/N7/pr6/3B4/k7/2QK4/8/8

#2

4 + 3

2838 Fun with Chess Miniatures 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Qa1#
    • 1...Rc6
      • 2.Bxc6#
  • Tries
    • 1.Qb3+?
      • 1...Ka5
        • 2.Qa3#
      • 1...Rxb3+!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qa5#
      • 1...Kb5
        • 2.Qb4#
        • 2.Qa5#
        • 2.Qc4#
      • 1...Rxc6
        • 2.Bxc6#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Rb5
        • 2.Qa1#
      • 1...a5
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK::QAR(A)
    • R(c);N_GUARD::B(C),XR(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • R(c);CHECK,XQ(A)
  • Actual
    • S(D);
    • Threat
      • QAR1(A)
    • Vars
      • R(c);OGATE,XS(D)::B(C),XR(c)
      • R(c);N_GUARD,P_PINQ(A)::QAB1(A),XR(c)
      • R(c);N_GUARD::QAR1(A),XR(c)
      • R(c);SBLOCK::QAR(A)
      • P(b);::QAR1(A),XP(b)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).