MESON Chess Problem Database

Problem Display
PID: 212829 (4B3/6k1/3K4/8/6N1/8/6Q1/8 w - - 0 1)

Speckmann, Werner

Schach-Echo, 1961

4B3/6k1/3K4/8/6N1/8/6Q1/8

#2

4 + 1

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sh6+?
      • 1...Kf6
        • 2.Qg6#
      • 1...Kxh6
        • 2.Qg6#
      • 1...Kf8
        • 2.Qg8#
      • 1...Kh8
        • 2.Qg8#
      • 1...Kh7!
    • 1.Qh1?
      • 1...Kf8
        • 2.Qh8#
      • 1...Kg8!
    • 1.Qh3?
      • 1...Kf8
        • 2.Qh8#
      • 1...Kg8!
    • 1.Qh2?
      • 1...Kf8
        • 2.Qh8#
      • 1...Kg8!
  • Keys
    • 1.Sf6+!
      • 1...Kxf6
        • 2.Qg6#
      • 1...Kh6
        • 2.Qg6#
      • 1...Kf8
        • 2.Qg8#
      • 1...Kh8
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(A)
        • K(a);S_FLIGHT,XS(B)::QAR1(A)
        • K(a);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(B);CHECK
    • Vars
      • K(a);S_FLIGHT,XS(B)::QAR1(A)
      • K(a);S_FLIGHT::QAR1(A)
      • K(a);OGATE,S_FLIGHT::QAR1(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).