MESON Chess Problem Database

Problem Display
PID: 273740 (k7/1R6/qp3K2/1p2N3/8/8/8/5Q1B w - - 0 1)

Lider, Valentin Viktorovich

Mat, 1972

k7/1R6/qp3K2/1p2N3/8/8/8/5Q1B

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Qxa1#
    • 1...b4
      • 2.Qxa6#
  • Tries
    • 1.Rb8+?
      • 1...Ka7
        • 2.Sc6#
        • 2.Ra8#
      • 1...Kxb8!
  • Keys
    • 1.Sd7!
      • 1...Qa1+
        • 2.Qxa1#
      • 1...Qxb7
        • 2.Qa1#
      • 1...Qa3
        • 2.Sxb6#
      • 1...Qa2
        • 2.Sxb6#
      • 1...Qa4
        • 2.Sxb6#
      • 1...Qa5
        • 2.Rc7#
      • 1...Qa7
        • 2.Rb8#
      • 1...b4
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • Q(b);OGATEB,P_PINS(C)::QAB(A),XQ(b)
    • P(a);OGATE::QAR2(A),XQ(b)
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(d);P-FLIGHT,XR(E)
  • Actual
    • S(C);
    • Vars
      • Q(b);CHECK,OGATEB::QAB(A),XQ(b)
      • Q(b);OGATEB,P_SPINQ(b),XR(E)::QAB(A)
      • Q(b);N_GUARD::S(C),XP(c)
      • Q(b);N_GUARD::B(B)+R(E)
      • Q(b);SBLOCK::B(B)+R(E),DCHECK
      • P(a);OGATE::QAR2(A),XQ(b)
HTML5 logo

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).