MESON Chess Problem Database

Problem Display
PID: 89919 (3KN3/3N4/P1k1p3/7r/2P5/4B3/6R1/Qq1r3B w - - 0 1)

Maleika, Gerhard

Die Schwalbe, 1971

3KN3/3N4/P1k1p3/7r/2P5/4B3/6R1/Qq1r3B

#2

9 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...e5
      • 2.Rg6#
  • Tries
    • 1.Rd2+?
      • 1...Qe4
        • 2.Sb8#
      • 1...Rdxh1
        • 2.Rd6#
      • 1...Rhxh1
        • 2.Se5#
      • 1...Rd5!
    • 1.Rg5+?
      • 1...Qe4
        • 2.Qa4#
      • 1...Rdxh1
        • 2.Se5#
      • 1...Rhxh1
        • 2.Rc5#
      • 1...Rd5!
  • Keys
    • 1.Rb2+!
      • 1...Qe4
        • 2.Rb6#
      • 1...Rdxh1
        • 2.Sb8#
      • 1...Rdd5
        • 2.Qa4#
      • 1...Rhxh1
        • 2.Qa4#
      • 1...Rhd5
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(e);::B(B)+R(C),DCHECK
  • Tries
    • Try
      • R(C);CHECK,N_SPINS(G)
      • Vars
        • Q(a);P_SPINQ(a)::S(G)
        • R(b);XB(B)::R1(C)
        • R(c);XB(B)::S(G)
      • Refutation
        • R(c);P_PINS(G),P_SPINR(c)
    • Try
      • R(C);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::QAB(A)
        • R(b);N_PINS(G),XB(B)::S(G)
        • R(c);XB(B)::R1(C)
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • R(C);CHECK
    • Vars
      • Q(a);P_SPINQ(a)::R1(C)
      • R(b);N_PINS(G),XB(B)::S(G)
      • R(b);P_SPINR(b)::QAB(A)
      • R(c);XB(B)::QAB(A)
      • R(c);P_SPINR(c)::QAB(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).