MESON Chess Problem Database

Problem Display
PID: 243776 (kq6/1R6/3p4/3B1Q2/8/5K2/8/8 w - - 0 1)

Bie, Hans Petter

Norsk Sjakkblad, 1998

kq6/1R6/3p4/3B1Q2/8/5K2/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc8
      • 2.Qxc8#
    • 1...Qf8
      • 2.Qxf8#
  • Tries
    • 1.Qf8?
      • threat
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
        • 2.Qxb8#
      • 1...Qc8
        • 2.Qxc8#
      • 1...Qd8
        • 2.Qxd8#
      • 1...Qe8
        • 2.Qxe8#
      • 1...Qxf8+!
  • Keys
    • 1.Qb1!
      • 1...Qf8+
        • 2.Rf7#
      • 1...Qxb7
        • 2.Qxb7#
      • 1...Qa7
        • 2.Rb8#
      • 1...Qc7
        • 2.Rxc7#
      • 1...Qc8
        • 2.Qa2#
        • 2.Qa1#
      • 1...Qd8
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
      • 1...Qe8
        • 2.Rd7#
      • 1...Qg8
        • 2.Rf7#
        • 2.Qa2#
        • 2.Qa1#
      • 1...Qh8
        • 2.Rc7#
        • 2.Rd7#
        • 2.Re7#
        • 2.Rf7#
        • 2.Rg7#
        • 2.Rh7#
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATEB::QAR2(C),XQ(c)
    • Q(c);OGATEB,P_PINQ(C)::QAR(C),XQ(c)
  • Tries
    • Try
      • Q(C);P_PINQ(c)
      • Threat
        • DUALS(7)
      • Vars
        • Q(c);OGATEB::QAR2(C),XQ(c)
        • Q(c);OGATEB::QAR(C),XQ(c)
      • Refutation
        • Q(c);CHECK,N_SPINQ(c),XQ(C)
  • Actual
    • Q(C);
    • Vars
      • Q(c);CHECK,N_GUARD::B(B)+R(D)
      • Q(c);OGATE,P_PINB(B),P_SPINQ(c),XR(D)::QAB1(C),XQ(c)
      • Q(c);SBLOCK::B(B)+R(D),DCHECK
      • Q(c);N_GUARD::B(B)+R(D),XQ(c)
      • Q(c);N_GUARD::B(B)+R(D)
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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).