MESON Chess Problem Database

Problem Display
PID: 181801 (4K2k/5P1q/6nR/8/3b4/8/8/4Q3 w - - 0 1)

Mach, Julius Zdenek

Zlata Praha, 1905

4K2k/5P1q/6nR/8/3b4/8/8/4Q3

#2

4 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.f8Q#
    • 1...Sh4
      • 2.f8Q#
    • 1...Se5
      • 2.f8Q#
  • Tries
    • 1.Qe5+?
      • 1...Sxe5
        • 2.f8Q#
      • 1...Bxe5!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Rxh7#
      • 1...Kg7
        • 2.Rxh7#
      • 1...Qxh6
        • 2.Qxh6#
      • 1...Sxh4
        • 2.f8Q#
      • 1...Sf8
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::P=Q
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);XQ(A)::P=Q
      • Refutation
        • B(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • R1(B),XQ(c)
    • Vars
      • K(d);N_SPINQ(c),S_FLIGHT::R1(B),XQ(c)
      • Q(c);OGATE,XR(B)::QAR2(A),XQ(c)
      • S(b);N_GUARD,XQ(A)::P=Q
      • S(b);N_GUARD::QAB(A),XB(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).