MESON Chess Problem Database

Problem Display
PID: 268329 (b3Nq2/N6R/n4R1b/4k3/2Pr4/3P4/1Q6/1KB4n w - - 0 1)

Lider, Valentin Viktorovich

4th Prize, KeyStip 27A. Ty., 1981

b3Nq2/N6R/n4R1b/4k3/2Pr4/3P4/1Q6/1KB4n

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Rxe7#
    • 1...Qh8
      • 2.Re7#
    • 1...Bf4
      • 2.Bxf4#
    • 1...Bg7
      • 2.Bf4#
      • 2.Rh5#
    • 1...Bc6
      • 2.Sxc6#
  • Tries
    • 1.Qh2+?
      • 1...Rf4
        • 2.Bb2#
      • 1...Bf4
        • 2.Rh5#
      • 1...Sg3!
    • 1.Qb5+?
      • 1...Qc5
        • 2.Re7#
      • 1...Rd5
        • 2.Bb2#
      • 1...Bd5
        • 2.Sc6#
      • 1...Sc5!
  • Keys
    • 1.Qe2+!
      • 1...Re4
        • 2.Bb2#
      • 1...Be3
        • 2.Rh5#
      • 1...Be4
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_GUARD::R(H),XQ(g)
    • Q(g);N_GUARD::R(H)
    • B(e);N_GUARD::B(B),XB(e)
    • B(f);N_GUARD::S(G),XB(f)
  • Tries
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • R(b);P_SPINR(b),S_CUTB(e),S_CUTS(a)::B(B)
        • B(e);OGATE,P_SPINB(e)::R(H)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(C);CHECK,N_PINR(b)
      • Vars
        • Q(g);P_SPINQ(g)::R(H)
        • R(b);P_SPINR(b),S_CUTB(f),S_CUTQ(g),S_CUTS(d)::B(B)
        • B(f);P_SPINB(f)::S(G)
      • Refutation
        • S(d);P_SPINS(d)
  • Actual
    • Q(C);CHECK,N_PINR(b)
    • Vars
      • R(b);P_SPINR(b),S_CUTB(e),S_CUTB(f)::B(B)
      • B(e);OGATE,P_SPINB(e)::R(H)
      • B(f);P_PINP(D),P_SPINB(f)::S(G)
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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).