MESON Chess Problem Database

Problem Display
PID: 218799 (6R1/8/5QK1/8/5p2/8/5k1N/5B2 w - - 0 1)

Schoen, Gerhard Ernst

Deutsche Schachzeitung, 1978

6R1/8/5QK1/8/5p2/8/5k1N/5B2

#2

5 + 2

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qd4+?
      • 1...Ke1
        • 2.Re8#
      • 1...Kg3!
  • Keys
    • 1.Qb2+!
      • 1...Ke1
        • 2.Qe2#
      • 1...Kg1
        • 2.Qg2#
      • 1...Ke3
        • 2.Re8#
      • 1...Kg3
        • 2.Kh5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(a);S_FLIGHT::R(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(C);CHECK,N_PINP(b)
    • Vars
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);OGATE,S_FLIGHT::QAR1(C)
      • K(a);S_FLIGHT::R(E)
      • K(a);S_FLIGHT::R(E)+K(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).