MESON Chess Problem Database

Problem Display
PID: 110134 (k1K4Q/r7/8/3p4/8/8/8/7R w - - 0 1)

Saks, Oleg Pavlovich

Kudesnik, 1991

k1K4Q/r7/8/3p4/8/8/8/7R

#2

3 + 3

6490 yacpdb 2009
5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rxa1#
      • 2.Qxa1#
  • Tries
    • 1.Qa1?
      • 1...Rxa1
        • 2.Rxa1#
      • 1...Ra2
        • 2.Qxa2#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qxa6#
      • 1...d4!
    • 1.Qb2?
      • threat
        • 2.Qb8#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rc7+!
  • Keys
    • 1.Ra1!
      • 1...Rxa1
        • 2.Qxa1#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Ra3
        • 2.Rxa3#
      • 1...Ra4
        • 2.Rxa4#
      • 1...Ra5
        • 2.Rxa5#
      • 1...Ra6
        • 2.Rxa6#
      • 1...d4
        • 2.Qh1#

Anticipated by 10832(1969), 262772(1977)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);P_PINR(b)
      • Vars
        • R(b);N_SPINR(b),OGATE,XQ(C)::R(A),XR(b)
        • R(b);OGATEB::QAR(C),XR(b)
        • R(b);OGATEB::QAR2(C),XR(b)
      • Refutation
        • P(a);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • R(b);N_GUARD::QAB1(C),XR(b)
      • Refutation
        • R(b);CHECK
  • Actual
    • R(A);P_PINR(b)
    • Vars
      • R(b);N_SPINR(b),OGATE,XR(A)::QAB(C),XR(b)
      • R(b);OGATEB::R(A),XR(b)
      • P(a);OGATEB::QAB(C)
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).