MESON Chess Problem Database

Problem Display
PID: 262775 (NR6/p7/8/k7/2K5/8/1P6/5B2 w - - 0 1)

Persa, Istvan

Szachy, 1979

NR6/p7/8/k7/2K5/8/1P6/5B2

#2

5 + 2

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ka6
      • 2.Kb4#
  • Tries
    • 1.Rb3?
      • threat
        • 2.Ra3#
      • 1...Ka4
        • 2.Ra3#
      • 1...Ka6!
    • 1.Rb5+?
      • 1...Ka6
        • 2.Sc7#
      • 1...Ka4!
    • 1.b3?
      • 1...Ka6
        • 2.Kb4#
      • 1...a6!
    • 1.b4+?
      • 1...Ka6
        • 2.Kb3#
        • 2.Kc3#
        • 2.Kd4#
        • 2.Kc5#
        • 2.Kd5#
        • 2.Sc7#
      • 1...Ka4!
  • Keys
    • 1.Sb6!
      • 1...Ka6
        • 2.Kb4#
      • 1...axb6
        • 2.Ra8#
      • 1...a6
        • 2.b4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::B(A)+K(C)
  • Tries
    • Try
      • R(E);
      • Threat
        • R(E)
      • Vars
        • K(a);P-FLIGHT::R1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(a);N_GUARD,P-FLIGHT::S(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(B);
      • Vars
        • K(a);P-FLIGHT::B(A)+K(C)
      • Refutation
        • P(b);
    • Try
      • P(B);CHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(D);
    • Vars
      • K(a);P-FLIGHT::B(A)+K(C)
      • P(b);OGATEB,SBLOCK,XS(D)::R(E)
      • P(b);SBLOCK::P(B)
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).