MESON Chess Problem Database

Problem Display
PID: 109203 (8/8/8/4K1p1/8/4N3/3N3p/R5qk w - - 0 1)

Prebeshkov, V

Kudesnik, 1991

8/8/8/4K1p1/8/4N3/3N3p/R5qk

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Rxb1#
    • 1...Qc1
      • 2.Rxc1#
    • 1...Qd1
      • 2.Rxd1#
    • 1...Qe1
      • 2.Rxe1#
    • 1...Qf1
      • 2.Rxf1#
  • Tries
    • 1.Se4?
      • threat
        • 2.Sf2#
        • 2.Sg3#
      • 1...Qb1
        • 2.Rxb1#
      • 1...Qc1
        • 2.Rxc1#
      • 1...Qd1
        • 2.Rxd1#
      • 1...Qe1
        • 2.Rxe1#
      • 1...Qf1
        • 2.Rxf1#
      • 1...Qxa1+!
  • Keys
    • 1.Sdf1!
      • threat
        • 2.Sg3#
      • 1...Qxe3+
        • 2.Sxe3#
      • 1...Qg3+
        • 2.Sxg3#
      • 1...Qxf1
        • 2.Rxf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(a);OGATEB::R(A),XQ(a)
    • Q(a);OGATEB,P_PINS(C)::R(A),XQ(a)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);OGATEB::R(A),XQ(a)
      • Refutation
        • Q(a);CHECK,N_SPINQ(a),XR(A)
  • Actual
    • S(B);N_PINQ(a)
    • Threat
      • S(B)
    • Vars
      • Q(a);CHECK,XS(C)::R(A)+S(B),XQ(a)
      • Q(a);CHECK::R(A)+S(B),DCHECK,XQ(a)
      • Q(a);OGATE,P_SPINQ(a),XS(B)::R(A),XQ(a)
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).