MESON Chess Problem Database

Problem Display
PID: 33184 (1Q6/4k1N1/4P2K/8/1P6/8/8/8 w - - 0 1)

Ohresser, PH

Bulletin de la FFE, 1938

1Q6/4k1N1/4P2K/8/1P6/8/8/8

#2

5 + 1

5454 Near Snap 1938

SOLUTION

  • SOUND
  • Tries
    • 1.Qa7+?
      • 1...Kd6
        • 2.Qc5#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Kf6!
    • 1.Qc7+?
      • 1...Kf8
        • 2.Qd8#
        • 2.Qf7#
      • 1...Kf6!
    • 1.Qb6?
      • 1...Kf8
        • 2.Qd8#
      • 1...Kf6!
    • 1.Qc8?
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6!
  • Keys
    • 1.Qb5!
      • 1...Kd6
        • 2.Qc5#
      • 1...Kf6
        • 2.Qg5#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qe8#

Anticipated by 24210(1927), 231090(1927)

This anticipates 16378(1940), 30942(1943), 47022(1955), 73436(1961), 12363(1978), 46971(1989), 142078(1989), 84992(1992), 120638(1995), 79159(2005)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);S_FLIGHT::QAR1(E)
        • K(a);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAR2(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);S_FLIGHT::QAR1(E)
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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).