MESON Chess Problem Database

Problem Display
PID: 249543 (8/8/5Np1/6Q1/8/7k/7n/7K w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1984

8/8/5Np1/6Q1/8/7k/7n/7K

#2

3 + 3

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qg4#
    • 1...Sf3
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
  • Tries
    • 1.Kg1?
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sf3+!
    • 1.Se4?
      • threat
        • 2.Sf2#
        • 2.Qg3#
      • 1...Sf1
        • 2.Sf2#
      • 1...Sg4!
    • 1.Qg1?
      • threat
        • 2.Qxh2#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Kh4!
    • 1.Qxg6?
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sf3
        • 2.Qg4#
      • 1...Kh4!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxh2#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sf3
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(a);N_GUARD::QAB1(B)
      • Refutation
        • S(a);CHECK
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(C)
      • Refutation
        • S(a);
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XS(a)
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);XP(c)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(a);N_GUARD::QAB1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XS(a)
    • Vars
      • S(a);N_GUARD::QAB1(B),XS(a)
      • S(a);N_GUARD::QAB1(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).