MESON Chess Problem Database

Problem Display
PID: 176200 (3n4/2R3R1/3k4/8/2K5/8/2B5/B7 w - - 0 1)

Vincze, Stefan

Schach-Echo, 1976

3n4/2R3R1/3k4/8/2K5/8/2B5/B7

#2

5 + 2

6490 yacpdb 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Rg6#
    • 1...Se6
      • 2.Rgd7#
  • Tries
    • 1.Be5+?
      • 1...Ke6
        • 2.Rce7#
        • 2.Rge7#
      • 1...Kxe5!
    • 1.Be4?
      • 1...Ke6
        • 2.Rg6#
      • 1...Sc6
        • 2.Rxc6#
      • 1...Se6
        • 2.Rc6#
        • 2.Rcd7#
        • 2.Rgd7#
      • 1...Sb7
        • 2.Rc6#
      • 1...Sf7!
    • 1.Rcd7+?
      • 1...Ke6
        • 2.Rge7#
      • 1...Kc6!
    • 1.Rge7?
      • threat
        • 2.Be5#
      • 1...Sc6
        • 2.Rcd7#
      • 1...Se6
        • 2.Red7#
      • 1...Sf7!
  • Keys
    • 1.Ra7!
      • 1...Kc6
        • 2.Ra6#
      • 1...Ke6
        • 2.Rg6#
      • 1...Sc6
        • 2.Rg6#
      • 1...Se6
        • 2.Ra6#
      • 1...Sb7
        • 2.Ra6#
      • 1...Sf7
        • 2.Rg6#

Anticipated by 4672(1886), 249051(1947), 132734(1958), 11700(1971)

This anticipates 152675(2011)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::R(E)
    • S(b);SBLOCK::R1(E)
  • Tries
    • Try
      • B(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XB(A)
    • Try
      • B(B);
      • Vars
        • K(a);P-FLIGHT::R(E)
        • S(b);N_GUARD::R1(D),XS(b)
        • S(b);N_GUARD::R1(D)
      • Refutation
        • S(b);
    • Try
      • R(D);CHECK
      • Vars
        • K(a);P-FLIGHT::R1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(E);
      • Threat
        • B(A)
      • Vars
        • S(b);SBLOCK::R1(D)
        • S(b);SBLOCK::R1(E)
      • Refutation
        • S(b);
  • Actual
    • R(D);
    • Vars
      • K(a);P-FLIGHT::R(D)
      • K(a);P-FLIGHT::R(E)
      • S(b);N_GUARD,SBLOCK::R(E)
      • S(b);N_GUARD,SBLOCK::R(D)
      • S(b);N_GUARD::R(D)
      • S(b);N_GUARD::R(E)
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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).