MESON Chess Problem Database

Problem Display
PID: 276210 (1K4R1/1Q6/3N4/3Nk3/8/8/3P4/8 w - - 0 1)

Doukas, N

To Mat, 1958

1K4R1/1Q6/3N4/3Nk3/8/8/3P4/8

#2

6 + 1

15601 Albrecht-Leiss-Degener Collection 2024
5454 Near Snap 2026

SOLUTION

  • SOUND
  • Tries
    • 1.Kc7?
      • 1...Ke6
        • 2.Re8#
      • 1...Kd4!
    • 1.Qc6?
      • 1...Ke6
        • 2.Re8#
      • 1...Kd4!
    • 1.d4+?
      • 1...Kxd6
        • 2.Rg6#
      • 1...Ke6
        • 2.Rg6#
      • 1...Kxd4!
  • Keys
    • 1.Sf4!
      • 1...Kd4
        • 2.Qd5#
      • 1...Kxf4
        • 2.Qe4#
      • 1...Kxd6
        • 2.Qc7#
      • 1...Kf6
        • 2.Qg7#

This anticipates 275756(1999), 286302(2013)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Vars
        • K(a);N_GUARD,P-FLIGHT::R(F)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::R(F)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • K(a);N_GUARD,S_FLIGHT,XS(C)::R(F)
        • K(a);N_GUARD,P-FLIGHT::R(F)
      • Refutation
        • K(a);S_FLIGHT,XP(A)
  • Actual
    • S(B);
    • Vars
      • K(a);N_GUARD,S_FLIGHT::QAR1(D)
      • K(a);N_GUARD,S_FLIGHT,XS(B)::QAR1(D)
      • K(a);OGATEB,S_FLIGHT,XS(C)::QAB1(D)
      • K(a);N_GUARD,S_FLIGHT::QAB1(D)
HTML5 logo

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).