MESON Chess Problem Database

Problem Display
PID: 23157 (5k2/7R/2B1n3/8/1K6/8/8/7Q w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

5k2/7R/2B1n3/8/1K6/8/8/7Q

#2

4 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Rf7+?
      • 1...Kg8
        • 2.Qh7#
      • 1...Kxf7!
    • 1.Qg2?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Sd4
        • 2.Qg7#
      • 1...Sf4
        • 2.Qg7#
      • 1...Sc5
        • 2.Qg7#
      • 1...Sc7
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...Sg5!
    • 1.Qf3+?
      • 1...Kg8
        • 2.Qf7#
      • 1...Sf4!
    • 1.Qf1+?
      • 1...Kg8
        • 2.Qf7#
      • 1...Sf4!
    • 1.Qg1?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Sf4
        • 2.Qg7#
      • 1...Sd4
        • 2.Qg7#
      • 1...Sc5
        • 2.Qg7#
      • 1...Sc7
        • 2.Qg7#
      • 1...Sd8
        • 2.Qg7#
      • 1...Sg5!
    • 1.Qh5?
      • threat
        • 2.Qf7#
        • 2.Qe8#
      • 1...Kg8
        • 2.Qf7#
      • 1...Sg5
        • 2.Qe8#
      • 1...Sc7
        • 2.Qf7#
      • 1...Sd8
        • 2.Qe8#
      • 1...Sg7!
    • 1.Qh6+?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kg8!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qh8#
      • 1...Kg8
        • 2.Qh8#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Sd4
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • Q(A);
      • Vars
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(a);N_GUARD::QAB1(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);
      • Vars
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(a);N_GUARD::QAB1(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
        • S(a);::QAR1(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • S(a);N_GUARD::QAR(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).