MESON Chess Problem Database

Problem Display
PID: 216854 (8/8/1r2R3/2kqB3/P5Q1/K7/8/8 w - - 0 1)

Ernst, Erich

Badische Neueste Nachrichten, 1992

8/8/1r2R3/2kqB3/P5Q1/K7/8/8

#2

5 + 3

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Qd4#
    • 1...Qg2
      • 2.Qd4#
    • 1...Qc6
      • 2.Qd4#
    • 1...Qb7
      • 2.Qd4#
    • 1...Qa8
      • 2.Qd4#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Rb4
      • 2.Qxb4#
    • 1...Ra6
      • 2.Qb4#
    • 1...Rc6
      • 2.Qb4#
  • Tries
    • 1.Qg1+?
      • 1...Qd4
        • 2.Qxd4#
      • 1...Kc4!
  • Keys
    • 1.Rc6+!
      • 1...Kxc6
        • 2.Qc8#
      • 1...Qxc6
        • 2.Qd4#
      • 1...Rxc6
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAB1(C)
    • Q(b);N_GUARD,P_PINP(B)::QAB1(C)
    • Q(b);N_GUARD::QAB1(C),XQ(b)
    • R(c);N_GUARD::QAB1(C),XR(c)
    • R(c);N_GUARD,P_PINP(B)::QAB1(C)
    • R(c);N_GUARD::QAB1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB1(C),XQ(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(E);CHECK
    • Vars
      • K(a);P-FLIGHT,XR(E)::QAR2(C)
      • Q(b);SBLOCK,XR(E)::QAB1(C)
      • R(c);SBLOCK,XR(E)::QAB1(C)
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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).