MESON Chess Problem Database

Problem Display
PID: 5043 (3QK3/8/8/1k2N3/N7/8/2P5/8 w - - 0 1)

Mendes da Costa, Henri

De Amsterdammer Weekblad voor Nederland, 1898

3QK3/8/8/1k2N3/N7/8/2P5/8

#2

5 + 1

5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ka6
      • 2.Qb6#
  • Tries
    • 1.Qd4?
      • 1...Ka6
        • 2.Qb6#
      • 1...Ka5!
    • 1.c3?
      • 1...Ka6
        • 2.Qb6#
      • 1...Kxa4!
  • Keys
    • 1.Sc6!
      • 1...Kxa4
        • 2.Qa5#
      • 1...Kc4
        • 2.Qd3#
      • 1...Ka6
        • 2.Qb6#
      • 1...Kxc6
        • 2.Qd7#

This anticipates 176153(1953), 7995(1995), 163136(2013)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAR1(D)
  • Tries
    • Try
      • Q(D);
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(A);
      • Vars
        • K(a);S_FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT,XS(B)::QAR1(D)
      • K(a);S_FLIGHT::QAB1(D)
      • K(a);S_FLIGHT::QAR1(D)
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(D)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).