MESON Chess Problem Database

Problem Display
PID: 262366 (8/7Q/4N3/3bk3/8/7B/2N5/K7 w - - 0 1)

Hair, H

Europe Echecs, 1987

8/7Q/4N3/3bk3/8/7B/2N5/K7

#2

5 + 2

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qc7#
    • 1...Kf6
      • 2.Qg7#
  • Tries
    • 1.Qc7+?
      • 1...Kf6
        • 2.Qg7#
      • 1...Ke4!
    • 1.Qd7?
      • 1...Kf6
        • 2.Qg7#
      • 1...Bxe6
        • 2.Qd4#
      • 1...Bh1
        • 2.Qd4#
      • 1...Ba2
        • 2.Qd4#
      • 1...Bg2
        • 2.Qd4#
      • 1...Bb3
        • 2.Qd4#
      • 1...Bf3
        • 2.Qd4#
      • 1...Bc4
        • 2.Qd4#
      • 1...Be4
        • 2.Qd4#
      • 1...Bc6
        • 2.Qd4#
      • 1...Bb7
        • 2.Qd4#
      • 1...Ba8
        • 2.Qd4#
      • 1...Ke4!
    • 1.Qg7+?
      • 1...Kd6
        • 2.Qc7#
      • 1...Ke4!
  • Keys
    • 1.Qa7!
      • 1...Ke4
        • 2.Qe3#
      • 1...Kd6
        • 2.Qc7#
      • 1...Kf6
        • 2.Qg7#
      • 1...Bxe6
        • 2.Qd4#
      • 1...Bh1
        • 2.Qd4#
      • 1...Ba2
        • 2.Qd4#
      • 1...Bg2
        • 2.Qd4#
      • 1...Bb3
        • 2.Qd4#
      • 1...Bf3
        • 2.Qd4#
      • 1...Bc4
        • 2.Qd4#
      • 1...Bc6
        • 2.Qd4#
      • 1...Bb7
        • 2.Qd4#
      • 1...Ba8
        • 2.Qd4#
      • 1...Be4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • K(b);N_GUARD,S_FLIGHT::QAB1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);N_GUARD,S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(b);N_GUARD,S_FLIGHT::QAB1(E)
        • B(a);OGATE,XS(D)::QAB1(E)
        • B(a);OGATE::QAB1(E)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);N_GUARD,S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(b);N_GUARD,P-FLIGHT,S_CUTB(a)::QAR1(E)
      • K(b);N_GUARD,S_FLIGHT::QAB1(E)
      • B(a);XS(D)::QAB1(E)
      • B(a);::QAB1(E)
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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).