MESON Chess Problem Database

Problem Display
PID: 227679 (8/4K3/6p1/4k1n1/2Q5/6N1/8/8 w - - 0 1)

Lazard, Frederic

Magyar Sakkvilag, 1926

8/4K3/6p1/4k1n1/2Q5/6N1/8/8

#2

3 + 3

6490 yacpdb 2020
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qe4#
    • 1...Sh3
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Se6
      • 2.Qe4#
    • 1...Sf7
      • 2.Qe4#
    • 1...Sh7
      • 2.Qe4#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qd6#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Kf4!
    • 1.Qa4?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sh3
        • 2.Qe4#
      • 1...Se6
        • 2.Qe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Sh7
        • 2.Qe4#
      • 1...Kd5!
    • 1.Qb4?
      • threat
        • 2.Qd6#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Kd5!
    • 1.Qg4?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sh3
        • 2.Qe4#
      • 1...Se6
        • 2.Qe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Sh7
        • 2.Qe4#
      • 1...Kd5!
    • 1.Qh4?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sh3
        • 2.Qe4#
      • 1...Se6
        • 2.Qe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Sh7
        • 2.Qe4#
      • 1...Kd5!
  • Keys
    • 1.Se2!
      • 1...Kf5
        • 2.Qf4#
      • 1...Sf3
        • 2.Qe6#
      • 1...Sh3
        • 2.Qe6#
      • 1...Se4
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sf7
        • 2.Qe6#
      • 1...Sh7
        • 2.Qe6#

Anticipated by 137435(1923)

This anticipates 171356(1995), 171403(1995)

This is a version of 23431

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 6
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(A);
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • S(b);N_GUARD::QAR1(B)
      • S(b);N_GUARD,SBLOCK::QAR1(B)
      • S(b);N_GUARD::QAR1(B),XS(b)
HTML5 logo

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).