MESON Chess Problem Database

Problem Display
PID: 141254 (8/1Q6/8/1p6/Np6/Nk6/8/1K6 w - - 0 1)

Schett, Sophie

Dufresne, 1881

8/1Q6/8/1p6/Np6/Nk6/8/1K6

#2

4 + 3

119 Tidskrift for Schack 1909
14868 Pirnie Collection 2011

SOLUTION

  • SOUND
  • Sets
    • 1...bxa3
      • 2.Qxb5#
    • 1...bxa4
      • 2.Qf3#
  • Tries
    • 1.Sc5+?
      • 1...Kxa3
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qa7#
      • 1...Kc3!
    • 1.Qd5+?
      • 1...Kxa3
        • 2.Qa2#
      • 1...Kxa4!
    • 1.Qa8?
      • 1...Kxa3
        • 2.Sc5#
      • 1...bxa4
        • 2.Qf3#
      • 1...bxa3!
    • 1.Qa7?
      • 1...Kxa3
        • 2.Sc5#
      • 1...bxa4
        • 2.Qe3#
      • 1...bxa3!
    • 1.Qf7+?
      • 1...Kxa3
        • 2.Qa2#
      • 1...Kxa4!
  • Keys
    • 1.Qa6!
      • 1...Kxa3
        • 2.Sc5#
      • 1...bxa3
        • 2.Qxb5#
      • 1...bxa4
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB,P_SPINP(c),SBLOCK,XS(B)::QAR2(D),XP(c)
    • P(c);P_SPINP(b),SBLOCK,XS(C)::QAR(D)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XS(B)::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(D);
      • Vars
        • K(a);P-FLIGHT,XS(B)::QAR(D)+S(C)
        • P(c);SBLOCK,XS(C)::QAR(D)
      • Refutation
        • P(b);XS(B)
    • Try
      • Q(D);
      • Vars
        • K(a);P-FLIGHT,XS(B)::QAR(D)+S(C)
        • P(c);SBLOCK,XS(C)::QAR(D)
      • Refutation
        • P(b);XS(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XS(B)::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
  • Actual
    • Q(D);
    • Vars
      • K(a);P-FLIGHT,XS(B)::QAR(D)+S(C)
      • P(b);OGATEB,SBLOCK,XS(B)::QAR2(D),XP(c)
      • P(c);OGATE,SBLOCK,XS(C)::QAR2(D)
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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).