MESON Chess Problem Database

Problem Display
PID: 227581 (3n4/N1kbPn2/P3p3/4P3/1R1R4/2K5/7Q/8 w - - 0 1)

ten Cate, Pieter

3rd Comm., 64 Shakhmatnoe obozrenie, 1926

3n4/N1kbPn2/P3p3/4P3/1R1R4/2K5/7Q/8

#2

8 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bc8
      • 2.e8S#
    • 1...Sxe5
      • 2.Qxe5#
    • 1...Sd6
      • 2.exd6#
    • 1...Sc6
      • 2.Rb7#
    • 1...Sb7
      • 2.Rxb7#
  • Tries
    • 1.Rdc4+?
      • 1...Sc6
        • 2.Rb7#
      • 1...Bc6!
  • Keys
    • 1.Qh7!
      • 1...Sxe5
        • 2.e8S#
      • 1...Bb5
        • 2.exd8Q#
      • 1...Sb7
        • 2.Rxb7#
      • 1...Ba4
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Bc6
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Bc8
        • 2.exd8Q#
        • 2.exd8B#
        • 2.e8S#
      • 1...Be8
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Sg5
        • 2.e8S#
      • 1...Sd6
        • 2.exd6#
      • 1...Sh6
        • 2.e8S#
      • 1...Sh8
        • 2.e8S#
      • 1...Sc6
        • 2.Rb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::P=S
    • S(d);OGATE,P_SPINS(d),XP(E)::QAB(A),XS(d)
    • S(d);OGATE::P(E),XS(d)
    • S(e);N_GUARD::R1(C)
    • S(e);N_GUARD::R1(C),XS(e)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(e);P_SPINS(e)::R1(C)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • Q(A);
    • Vars
      • S(d);S_CUTB(c),XP(E)::P=S
      • B(c);S_CUTS(d)::PXS(e)=Q
      • S(e);N_GUARD::R1(C),XS(e)
      • S(d);S_CUTB(c)::P=S
      • S(d);OGATE::P(E),XS(d)
      • S(e);N_GUARD::R1(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).