MESON Chess Problem Database

Problem Display
PID: 250977 (8/8/8/3pp3/4k3/8/4KQ2/8 w - - 0 1)

Keirans, Peteris

Die Schwalbe, 1930

8/8/8/3pp3/4k3/8/4KQ2/8

#2

2 + 3

3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d4
      • 2.Qf3#
  • Tries
    • 1.Qf1?
      • 1...d4
        • 2.Qf3#
      • 1...Kd4!
    • 1.Qf6?
      • 1...d4
        • 2.Qf3#
      • 1...Kd4!
    • 1.Qf7?
      • 1...d4
        • 2.Qf3#
      • 1...Kd4!
  • Keys
    • 1.Qf8!
      • 1...Kd4
        • 2.Qb4#
      • 1...d4
        • 2.Qf3#

Anticipated by 23602(1879), 135915(1897)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAB1(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);N_GUARD,P-FLIGHT,S_CUTP(b)::QAR2(B)
      • P(b);SBLOCK::QAB1(B)
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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).