MESON Chess Problem Database

Problem Display
PID: 204610 (8/8/5K2/7k/Q5p1/8/8/8 w - - 0 1)

Aschemann, Ralf

Deutsche Schachzeitung, 1976

8/8/5K2/7k/Q5p1/8/8/8

#2

2 + 2

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qd1?
      • threat
        • 2.Qh1#
      • 1...Kh6
        • 2.Qh1#
      • 1...Kh4!
    • 1.Qc2?
      • threat
        • 2.Qh7#
        • 2.Qh2#
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh6
        • 2.Qg6#
        • 2.Qh2#
      • 1...g3!
    • 1.Qe8+?
      • 1...Kh6
        • 2.Qg6#
        • 2.Qh8#
      • 1...Kh4!
    • 1.Qa2?
      • threat
        • 2.Qh2#
      • 1...Kh4
        • 2.Qh2#
      • 1...Kh6
        • 2.Qh2#
      • 1...g3!
    • 1.Qxg4+?
      • 1...Kh6
        • 2.Qh3#
        • 2.Qh4#
        • 2.Qg6#
      • 1...Kxg4!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qh2#
        • 2.Qg5#
      • 1...Kh4
        • 2.Qh2#
      • 1...g3
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAR(A)
      • Vars
        • K(b);N_SPINP(a),P-FLIGHT::QAR(A)
      • Refutation
        • K(b);N_SPINP(a),P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • K(b);P-FLIGHT::QAR2(A)
        • K(b);P-FLIGHT::QAR(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK,XP(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);P-FLIGHT,P_SPINP(a)::QAR2(A)
      • P(a);::QAR1(A)
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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).