MESON Chess Problem Database

Problem Display
PID: 286081 (1K1N4/4k3/5N2/8/8/8/3B4/3Q4 w - - 0 1)

Mealor, David

Problem Paradise, 2013

1K1N4/4k3/5N2/8/8/8/3B4/3Q4

#2

5 + 1

15601 Albrecht-Leiss-Degener Collection 2026
3713 Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd8
      • 2.Bb4#
  • Tries
    • 1.Qe2+?
      • 1...Kd6
        • 2.Bb4#
      • 1...Kxd8
        • 2.Ba5#
        • 2.Qe8#
      • 1...Kf8
        • 2.Bh6#
      • 1...Kxf6!
    • 1.Qg4?
      • 1...Kxf6
        • 2.Qg5#
      • 1...Kxd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Bb4#
      • 1...Kd6!
    • 1.Qe1+?
      • 1...Kd6
        • 2.Bb4#
      • 1...Kxd8
        • 2.Ba5#
        • 2.Qe8#
      • 1...Kf8
        • 2.Bh6#
      • 1...Kxf6!
  • Keys
    • 1.Qh5!
      • 1...Kd6
        • 2.Bb4#
      • 1...Kxf6
        • 2.Qg5#
      • 1...Kxd8
        • 2.Qe8#
      • 1...Kf8
        • 2.Qf7#

Anticipated by 136856(1976)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,S_FLIGHT,XS(E)::QAR(A)+B(B)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);N_GUARD,S_FLIGHT::B(B)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • Q(A);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
        • K(a);N_GUARD,S_FLIGHT,XS(E)::QAR1(A)
        • K(a);N_GUARD,S_FLIGHT::B(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);N_GUARD,S_FLIGHT::B(B)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
  • Actual
    • Q(A);
    • Vars
      • K(a);N_GUARD,S_FLIGHT::B(B)
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(A)
      • K(a);N_GUARD,S_FLIGHT,XS(E)::QAR1(A)
      • K(a);N_GUARD,S_FLIGHT::QAR1(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).