MESON Chess Problem Database

Problem Display
PID: 23059 (8/8/3n4/8/5Q1p/7k/5P1n/7K w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

8/8/3n4/8/5Q1p/7k/5P1n/7K

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sg4
      • 2.Qf3#
  • Tries
    • 1.Qe3+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kg4!
    • 1.Qe4?
      • threat
        • 2.Qg2#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sxe4!
    • 1.Qf5+?
      • 1...Sg4
        • 2.Qf3#
      • 1...Sxf5!
  • Keys
    • 1.f3!
      • threat
        • 2.Qxh2#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(C),XS(a)
    • S(a);N_GUARD::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR2(C),XS(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);N_GUARD::QAR2(C),XS(a)
      • Refutation
        • S(d);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR2(C)
      • Refutation
        • S(d);XQ(C)
  • Actual
    • P(B);
    • Threat
      • QAR1(C),XS(a)
    • Vars
      • S(a);OGATE,XP(B)::QAR2(C),XS(a)
      • S(a);N_GUARD::QAB1(C)
      • S(a);N_GUARD::QAB1(C),XS(a)
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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).