MESON Chess Problem Database

Problem Display
PID: 178742 (bQ6/8/N1k1K3/b1N5/8/8/8/8 w - - 0 1)

Holm, Karl Helmer

Springaren, 1948

bQ6/8/N1k1K3/b1N5/8/8/8/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bb6
      • 2.Qe8#
    • 1...Bb7
      • 2.Qxb7#
  • Tries
    • 1.Sd7?
      • threat
        • 2.Se5#
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bc3
        • 2.Qb6#
      • 1...Bc7
        • 2.Sb4#
      • 1...Bb7!
    • 1.Qxa8+?
      • 1...Kb6
        • 2.Qb7#
      • 1...Kb5!
  • Keys
    • 1.Sa4!
      • 1...Bb6
        • 2.Qxb6#
      • 1...Bb7
        • 2.Qe8#
      • 1...Be1
        • 2.Qb6#
      • 1...Bd2
        • 2.Qb6#
      • 1...Bc3
        • 2.Qb6#
      • 1...Bb4
        • 2.Sxb4#
        • 2.Qb6#
      • 1...Bc7
        • 2.Sb4#
      • 1...Bd8
        • 2.Sb4#

There are these versions: 185163

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::QAB(D)
    • B(c);N_GUARD::QAB1(D),XB(c)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • B(a);N_GUARD::QAR1(D),XB(a)
        • B(a);N_GUARD::QAR1(D)
        • B(a);N_GUARD::S(B)
      • Refutation
        • B(c);
    • Try
      • Q(D);CHECK,XB(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(D)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(A);
    • Vars
      • B(a);N_GUARD::QAR1(D),XB(a)
      • B(c);SBLOCK::QAB(D)
      • B(a);N_GUARD::QAR1(D)
      • B(a);N_GUARD::S(B)
HTML5 logo

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).