Problem Display
PID: 241498 (8/1B5p/r2ppR1K/3p1Np1/2Npk1p1/4PnP1/2P5/7Q w - - 0 1)

Pilchenko, Viacheslav Karlovich

Shavirin, Valery Mikhailovich

Szachy, 1979

8/1B5p/r2ppR1K/3p1Np1/2Npk1p1/4PnP1/2P5/7Q

#2

9 + 10


15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION


  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sfxd6#
    • 1...Ra2
      • 2.Sfxd6#
    • 1...Ra3
      • 2.Sfxd6#
    • 1...Ra4
      • 2.Sfxd6#
    • 1...Ra5
      • 2.Sfxd6#
    • 1...Ra7
      • 2.Sfxd6#
    • 1...Ra8
      • 2.Sfxd6#
    • 1...exf5
      • 2.Re6#
    • 1...e5
      • 2.Sd2#
  • Tries
    • 1.Se7?
      • threat
        • 2.Rxe6#
      • 1...e5
        • 2.Bxd5#
      • 1...dxe3!
    • 1.Qd1?
      • threat
        • 2.Qd3#
      • 1...Ra3
        • 2.Sfxd6#
      • 1...Se1
        • 2.Qxg4#
      • 1...Sg1
        • 2.Qxg4#
      • 1...Sd2
        • 2.Qxg4#
      • 1...Sh4
        • 2.Qxg4#
      • 1...Se5
        • 2.Sd2#
      • 1...d3
        • 2.Qxd3#
        • 2.cxd3#
      • 1...Sh2!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qd3#
      • 1...Ra3
        • 2.Sfxd6#
      • 1...Se1
        • 2.Rxe6#
      • 1...Sg1
        • 2.Rxe6#
      • 1...Sd2
        • 2.Rxe6#
      • 1...Sh2
        • 2.Rxe6#
      • 1...Sh4
        • 2.Rxe6#
      • 1...Se5
        • 2.Sd2#
      • 1...d3
        • 2.Qxd3#
        • 2.cxd3#

This anticipates 239008(2014)

FEATURES


  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 8
  • Sets
    • R(g);N_GUARD::S(F),XP(h)
    • P(i);SBLOCK,XS(F)::R(G)
    • P(i);SBLOCK::S(E)
  • Tries
    • Try
      • S(F);
      • Threat
        • R(G),XP(i)
      • Vars
        • P(i);N_GUARD::B(I),XP(e)
      • Refutation
        • P(b);XP(C)
    • Try
      • Q(A);N_PINS(a)
      • Threat
        • QAB1(A)
      • Vars
        • R(g);N_GUARD::S(F),XP(h)
        • S(a);OGATE::QAR2(A),XP(d)
        • S(a);N_GUARD,SBLOCK::S(E)
      • Refutation
        • S(a);
  • Actual
    • Q(A);N_PINS(a)
    • Threat
      • QAB1(A)
    • Vars
      • R(g);N_GUARD::S(F),XP(h)
      • S(a);N_GUARD::R(G),XP(i)
      • S(a);N_GUARD,SBLOCK::S(E)


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).