MESON Chess Problem Database

Problem Display
PID: 233248 (1r4q1/6p1/2NN4/8/p7/kP1Q4/b1p5/2K5 w - - 0 1)

Muller, Dieter

Freie Presse, 1969

1r4q1/6p1/2NN4/8/p7/kP1Q4/b1p5/2K5

#2

5 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb3
      • 2.Sc4#
    • 1...Qc4
      • 2.Sxc4#
    • 1...Qh7
      • 2.Sc4#
    • 1...Qc8
      • 2.Sc4#
    • 1...Qd8
      • 2.Sc4#
    • 1...Qe8
      • 2.Sc4#
    • 1...Qf8
      • 2.Sc4#
    • 1...Qh8
      • 2.Sc4#
    • 1...Rxb3
      • 2.Sb5#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Ra8
      • 2.Sb5#
    • 1...Rc8
      • 2.Sb5#
    • 1...Rd8
      • 2.Sb5#
    • 1...Re8
      • 2.Sb5#
    • 1...Rf8
      • 2.Sb5#
    • 1...axb3
      • 2.Qa6#
  • Tries
    • 1.b4+?
      • 1...Qb3
        • 2.Sc4#
      • 1...Bb3!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qb2#
      • 1...Qxb3
        • 2.Sc4#
      • 1...Rxb3
        • 2.Sb5#
      • 1...axb3
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 13
  • Sets
    • Q(g);N_GUARD,P_SPINQ(g),XP(B)::S(E)
    • Q(g);N_GUARD::S(E),XQ(g)
    • Q(g);N_GUARD::S(E)
    • R(f);N_GUARD,P_SPINR(f),XP(B)::S(E)
    • R(f);N_GUARD::S(E),XR(f)
    • R(f);N_GUARD::S(E)
    • P(d);OGATEB,P_SPINP(d),SBLOCK,XP(B)::QAR(C)
  • Tries
    • Try
      • P(B);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::S(E)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(B)::S(E)
      • R(f);N_GUARD,P_SPINR(f),XP(B)::S(E)
      • P(d);OGATEB,P_SPINP(d),SBLOCK,XP(B)::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).