MESON Chess Problem Database

Problem Display
PID: 232401 (8/8/8/4N1P1/2Qpk3/4N1K1/8/8 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1985

8/8/8/4N1P1/2Qpk3/4N1K1/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe3
      • 2.Qd3#
    • 1...Kxe5
      • 2.Qd5#
  • Tries
    • 1.Kg4?
      • 1...Kxe5
        • 2.Qd5#
      • 1...Kxe3!
    • 1.Qc6+?
      • 1...Kxe5
        • 2.Qd5#
      • 1...Kxe3!
    • 1.g6?
      • 1...Kxe3
        • 2.Qd3#
      • 1...Kxe5!
  • Keys
    • 1.Qb4!
      • 1...Kxe3
        • 2.Qe1#
      • 1...Kxe5
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(a),P-FLIGHT,XS(A)::QAR1(C)
    • K(b);N_SPINP(a),P-FLIGHT,XS(D)::QAR1(C)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT,XS(D)::QAR1(C)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,XS(A)
    • Try
      • Q(C);CHECK,N_PINP(a)
      • Vars
        • K(b);P-FLIGHT,XS(D)::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT,XS(A)
    • Try
      • P(E);
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT,XS(A)::QAR1(C)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT,XS(D)
  • Actual
    • Q(C);
    • Vars
      • K(b);N_SPINP(a),OGATEB,P-FLIGHT,XS(A)::QAR2(C)
      • K(b);N_SPINP(a),OGATEB,P-FLIGHT,XS(D)::QAR2(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).