MESON Chess Problem Database

Problem Display
PID: 176170 (6b1/8/5K1k/8/7n/8/4Q2N/8 w - - 0 1)

Petkov, Petko Andonov

Schach-Echo, 1960

6b1/8/5K1k/8/7n/8/4Q2N/8

#2

3 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kh7
      • 2.Qh5#
  • Tries
    • 1.Qg4?
      • threat
        • 2.Qxh4#
      • 1...Kh7
        • 2.Qh5#
        • 2.Qxh4#
        • 2.Qg7#
      • 1...Sg2
        • 2.Qg6#
      • 1...Sf3
        • 2.Qg6#
      • 1...Sf5
        • 2.Qg6#
      • 1...Sg6
        • 2.Qxg6#
      • 1...Bf7!
    • 1.Qd2+?
      • 1...Kh5
        • 2.Qg5#
      • 1...Kh7!
    • 1.Qe3+?
      • 1...Kh5
        • 2.Qg5#
      • 1...Kh7!
  • Keys
    • 1.Qe8!
      • 1...Kh7
        • 2.Qh5#
      • 1...Bf7
        • 2.Qh8#
      • 1...Sg6
        • 2.Qxg6#
      • 1...Ba2
        • 2.Qh8#
      • 1...Bb3
        • 2.Qh8#
      • 1...Bc4
        • 2.Qh8#
      • 1...Bd5
        • 2.Qh8#
      • 1...Be6
        • 2.Qh8#
      • 1...Bh7
        • 2.Sg4#
      • 1...Sg2
        • 2.Qg6#
      • 1...Sf3
        • 2.Qg6#
      • 1...Sf5
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR2(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR2(A),XS(a)
      • Vars
        • S(a);N_GUARD::QAR1(A)
        • S(a);N_GUARD::QAR1(A),XS(a)
      • Refutation
        • B(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • B(c);OGATE::QAR2(A)
      • S(a);N_GUARD::QAR1(A),XS(a)
      • B(c);SBLOCK::S(B)
      • S(a);N_GUARD::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).