MESON Chess Problem Database

Problem Display
PID: 198409 (8/8/8/8/BkN2Q2/4K3/P7/8 w - - 0 1)

Ostergaard, EGP

Skakbladet, 1920

8/8/8/8/BkN2Q2/4K3/P7/8

#2

5 + 1

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Kd3?
      • 1...Kc5
        • 2.Qd6#
      • 1...Kxa4!
    • 1.Qc7?
      • 1...Kxa4
        • 2.Qa5#
      • 1...Kc3!
    • 1.Qb8+?
      • 1...Kc3
        • 2.Qb3#
      • 1...Kxa4
        • 2.Qb3#
      • 1...Kc5
        • 2.Qb5#
      • 1...Kxc4!
    • 1.a3+?
      • 1...Kc3
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Kxa4!
  • Keys
    • 1.Qe5!
      • 1...Kxa4
        • 2.Qa5#
      • 1...Kxc4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT,XB(C)
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT,XB(C)::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(E)
        • K(a);OGATE,P-FLIGHT,XB(C)::QAB1(E)
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT,XS(D)
    • Try
      • P(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);P-FLIGHT,XB(C)
  • Actual
    • Q(E);
    • Vars
      • K(a);P-FLIGHT,XB(C)::QAR1(E)
      • K(a);OGATEB,P-FLIGHT,XS(D)::QAR1(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).