MESON Chess Problem Database

Problem Display
PID: 249701 (2q2k1K/6R1/7p/2N1r2B/8/8/8/1Q6 w - - 0 1)

Duinker, PS

Schakend Nederland, 1984

2q2k1K/6R1/7p/2N1r2B/8/8/8/1Q6

#2

5 + 4

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Sd7#
    • 1...Qd7
      • 2.Sxd7#
    • 1...Qa8
      • 2.Sd7#
    • 1...Qb8
      • 2.Sd7#
    • 1...Re7
      • 2.Rg8#
    • 1...Re8
      • 2.Rf7#
  • Tries
    • 1.Qh7?
      • threat
        • 2.Rg8#
        • 2.Qg8#
      • 1...Qg4
        • 2.Qg8#
      • 1...Rg5
        • 2.Qg8#
      • 1...Qe6!
    • 1.Qf1+?
      • 1...Qf5
        • 2.Sd7#
      • 1...Rf5!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Sd7#
      • 1...Rxc5
        • 2.Qd6#
      • 1...Rxh5
        • 2.Qxc8#
      • 1...Rd5
        • 2.Se6#
      • 1...Re7
        • 2.Rg8#
      • 1...Re8
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::S(B)
    • Q(c);N_GUARD::S(B),XQ(c)
    • R(a);SBLOCK::R1(D)
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);::QAR1(A)
        • R(a);::QAR1(A)
      • Refutation
        • Q(c);
    • Try
      • Q(A);CHECK
      • Vars
        • Q(c);P_SPINQ(c)::S(B)
      • Refutation
        • R(a);P_SPINR(a)
  • Actual
    • Q(A);P_PINQ(c)
    • Threat
      • S(B)
    • Vars
      • R(a);N_GUARD,XS(B)::QAB(A)
      • R(a);N_GUARD,XB(C)::QAR(A),XQ(c)
      • R(a);N_GUARD::S(B)
      • R(a);SBLOCK::R1(D)
      • R(a);N_SPINQ(c),SBLOCK::R1(D)
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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).