MESON Chess Problem Database

Problem Display
PID: 67533 (k3N3/p2K4/8/8/8/1q6/6R1/7Q w - - 0 1)

Lindgren, Bo Waldemar

1st Prize, Skakbladet TT, 1961

k3N3/p2K4/8/8/8/1q6/6R1/7Q

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Rxb2#
  • Tries
    • 1.Rg8+?
      • 1...Qd5+
        • 2.Sd6#
      • 1...Qf3
        • 2.Sd6#
      • 1...Qb7+
        • 2.Sc7#
      • 1...Kb8!
  • Keys
    • 1.Rb2+!
      • 1...Kb8
        • 2.Rxb3#
      • 1...Qd5+
        • 2.Qxd5#
      • 1...Qf3
        • 2.Sc7#
        • 2.Qxf3#
      • 1...Qb7+
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD::QAB(A)+R(B),XQ(a)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • Q(a);CHECK,P_SPINQ(a)::R(B)+S(D)
        • Q(a);P_SPINQ(a)::R(B)+S(D)
        • Q(a);CHECK,P_SPINQ(a)::R(B)+S(D),DCHECK
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(B);CHECK
    • Vars
      • K(c);P-FLIGHT,P_SPINQ(a)::R(B),XQ(a)
      • Q(a);CHECK,N_GUARD,P_SPINQ(a)::QAB(A),XQ(a)
      • Q(a);CHECK,N_GUARD,P_SPINQ(a)::QAB1(A),XQ(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).