MESON Chess Problem Database

Problem Display
PID: 249382 (6k1/8/6K1/8/6Q1/b7/8/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1971

6k1/8/6K1/8/6Q1/b7/8/8

#2

2 + 2

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Qc8#
    • 1...Bb2
      • 2.Qc8#
  • Tries
    • 1.Qe6+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kh8!
    • 1.Qd7?
      • threat
        • 2.Qg7#
      • 1...Kf8
        • 2.Qf7#
        • 2.Qd8#
      • 1...Kh8
        • 2.Qg7#
        • 2.Qh7#
      • 1...Bb2
        • 2.Qc8#
        • 2.Qe8#
        • 2.Qd8#
      • 1...Bf8
        • 2.Qh7#
      • 1...Be7!
    • 1.Qc4+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kh8!
    • 1.Qd4?
      • threat
        • 2.Qg7#
      • 1...Kf8
        • 2.Qd8#
      • 1...Bb2
        • 2.Qd8#
      • 1...Bf8!
  • Keys
    • 1.Kf6+!
      • 1...Kh7
        • 2.Qg7#
      • 1...Kf8
        • 2.Qc8#
      • 1...Kh8
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::QAR(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);SBLOCK::QAB1(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • B(a);N_GUARD::QAR(A)
      • Refutation
        • B(a);
  • Actual
    • K(B);CHECK,P-FLIGHT
    • Vars
      • K(b);S_FLIGHT::QAR1(A)
      • K(b);P-FLIGHT::QAR(A)
      • K(b);P-FLIGHT::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).