MESON Chess Problem Database

Problem Display
PID: 204265 (6kq/4K1pN/6Q1/7n/8/8/8/8 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

6kq/4K1pN/6Q1/7n/8/8/8/8

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh7
      • 2.Qe8#
    • 1...Sg3
      • 2.Sf6#
    • 1...Sf4
      • 2.Sf6#
    • 1...Sf6
      • 2.Sxf6#
  • Tries
    • 1.Ke8?
      • 1...Sf6+
        • 2.Sxf6#
      • 1...Sg3
        • 2.Sf6#
      • 1...Sf4
        • 2.Sf6#
      • 1...Qxh7!
    • 1.Sf8?
      • threat
        • 2.Qf7#
        • 2.Qe6#
      • 1...Qh7
        • 2.Qxh7#
      • 1...Sf4
        • 2.Qf7#
      • 1...Sf6
        • 2.Qf7#
      • 1...Qh6!
    • 1.Qxh5?
      • 1...Qxh7
        • 2.Qe8#
      • 1...g5
        • 2.Qf7#
      • 1...g6!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qf7#
        • 2.Qe8#
        • 2.Qe6#
      • 1...Qh6
        • 2.Qe8#
      • 1...Qh7
        • 2.Qxh7#
        • 2.Qe8#
      • 1...Sf4
        • 2.Qf7#
        • 2.Qe8#
      • 1...Sf6
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(d);SBLOCK,XS(C)::QAR2(A)
    • S(a);N_GUARD::S(C)
    • S(a);N_GUARD::S(C),XS(a)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(a);CHECK,N_GUARD::S(C),XS(a)
        • S(a);N_GUARD::S(C)
      • Refutation
        • Q(d);XS(C)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(d);N_GUARD::QAB1(A),XQ(d)
        • S(a);::QAB1(A)
      • Refutation
        • Q(d);
    • Try
      • Q(A);N_PINP(b),XS(a)
      • Vars
        • Q(d);SBLOCK,XS(C)::QAR2(A)
        • P(b);::QAB1(A)
      • Refutation
        • P(b);
  • Actual
    • S(C);
    • Threat
      • DUALS(3)
    • Vars
      • Q(d);::QAR2(A)
      • S(a);::QAB1(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).