MESON Chess Problem Database

Problem Display
PID: 124343 (7n/4N2B/4pPq1/4p2n/R2pk3/5R2/5P2/1K4bQ w - - 0 1)

Lider, Valentin Viktorovich

Northwest Chess, 1979

7n/4N2B/4pPq1/4p2n/R2pk3/5R2/5P2/1K4bQ

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Re3#
    • 1...Sf7
      • 2.Bxg6#
  • Tries
    • 1.Qh4+?
      • 1...Sf4
        • 2.Re3#
      • 1...Kxf3+!
  • Keys
    • 1.Raa3!
      • 1...Qxh7
        • 2.Rf5#
      • 1...Bxf2
        • 2.Rxf2#
      • 1...Sxf6
        • 2.Rxf6#
      • 1...d3
        • 2.Ra4#
      • 1...Qf5
        • 2.Rxf5#
      • 1...Bh2
        • 2.Qe1#
      • 1...Sg3
        • 2.Qh4#
      • 1...Sf4
        • 2.Rfe3#
      • 1...Sg7
        • 2.Qh4#
      • 1...Sf7
        • 2.Bxg6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(e);SBLOCK::QAB(B)+R(D),DCHECK
    • S(h);N_GUARD::B(H),XQ(g)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(e);P_SPINS(e)::R1(D)
      • Refutation
        • K(c);CHECK,N_SPINP(b),N_SPINQ(g),S_FLIGHT,XR(D)
  • Actual
    • R(E);N_PINP(b)
    • Vars
      • Q(g);N_GUARD,N_SPINQ(g),XB(H)::QAB(B)+R(D)
      • B(a);OGATE,XP(C)::QAB(B)+R(D),XB(a)
      • S(e);OGATE,XP(F)::QAB(B)+R(D),XS(e)
      • P(b);OGATEB::R(E)
      • Q(g);N_GUARD::QAB(B)+R(D),XQ(g)
      • B(a);OGATE::QAR(B)
      • S(e);N_GUARD::QAR(B)
      • S(e);SBLOCK::QAB(B)+R(D),DCHECK
      • S(h);N_GUARD::B(H),XQ(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).