MESON Chess Problem Database

Problem Display
PID: 187410 (7B/8/6Q1/2pr4/3p1kN1/8/5K2/8 w - - 0 1)

Ahues, Herbert Siegfried Oskar

harmonie-aktiv, 2014

7B/8/6Q1/2pr4/3p1kN1/8/5K2/8

#2

4 + 4

5454 Near Snap 2019
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Bxe5#
    • 1...Rd6
      • 2.Be5#
    • 1...Rd7
      • 2.Be5#
    • 1...Rd8
      • 2.Be5#
  • Tries
    • 1.Se5?
      • threat
        • 2.Sd3#
        • 2.Qg4#
      • 1...d3
        • 2.Qg4#
      • 1...c4
        • 2.Qg4#
      • 1...Rxe5!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Sxd5#
      • 1...Ke5
        • 2.Sh5#
      • 1...Rg5
        • 2.Qe4#
      • 1...Re5
        • 2.Qg4#
      • 1...Rf5
        • 2.Qg3#
      • 1...Rh5
        • 2.Sxh5#
      • 1...Rd6
        • 2.Sh5#
      • 1...Rd7
        • 2.Sh5#
      • 1...Rd8
        • 2.Sh5#

Anticipated by 4695(1887), 120949(1901), 52598(1960), 238658(1970), 102478(1975)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(d);N_GUARD::B(D),XR(d)
    • R(d);N_GUARD::B(D)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAR1(C)
        • P(c);::QAR1(C)
      • Refutation
        • R(d);XS(B)
  • Actual
    • S(B);
    • Threat
      • S(B),XR(d)
    • Vars
      • K(b);S_FLIGHT::B(D)+S(B)
      • R(d);SBLOCK::QAR1(C)
      • R(d);SBLOCK::QAB1(C)
      • R(d);N_GUARD::S(B),XR(d)
      • R(d);N_GUARD::S(B)
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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).