MESON Chess Problem Database

Problem Display
PID: 77909 (3r4/1B5N/1P1Pk2K/1Qp1p3/4n3/5R2/8/8 w - - 0 1)

Zalkind, Lazar Borissovich

4th Prize, 64 Shakhmatnoe obozrenie, 1925

3r4/1B5N/1P1Pk2K/1Qp1p3/4n3/5R2/8/8

#2

7 + 5

3713 Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd6
      • 2.Qe8#
    • 1...Sd2
      • 2.Rf6#
    • 1...Sf2
      • 2.Rf6#
    • 1...Sc3
      • 2.Rf6#
    • 1...Sg3
      • 2.Rf6#
    • 1...Sg5
      • 2.Rf6#
    • 1...Sf6
      • 2.Rxf6#
  • Tries
    • 1.Qe8+?
      • 1...Kxd6
        • 2.Rd3#
      • 1...Rxe8!
  • Keys
    • 1.Rf7!
      • 1...Kxd6
        • 2.Qc6#
      • 1...Kxf7
        • 2.Bd5#
      • 1...Rxd6
        • 2.Qe8#
      • 1...Sxd6
        • 2.Sg5#
      • 1...Sf6
        • 2.Rxf6#
      • 1...Rd7
        • 2.Qxd7#
      • 1...Ra8
        • 2.Qd7#
      • 1...Rb8
        • 2.Qd7#
      • 1...Rc8
        • 2.Qd7#
      • 1...Re8
        • 2.Qd7#
      • 1...Rf8
        • 2.Qd7#
      • 1...Rg8
        • 2.Qd7#
      • 1...Rh8
        • 2.Qd7#
      • 1...Sd2
        • 2.Rf6#
      • 1...Sf2
        • 2.Rf6#
      • 1...Sc3
        • 2.Rf6#
      • 1...Sg3
        • 2.Rf6#
      • 1...Sg5
        • 2.Rf6#
      • 1...c4
        • 2.Qd5#

Anticipated by 165629(1909-1910)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • R(e);N_GUARD,SBLOCK,XP(D)::QAR2(B)
    • S(a);N_GUARD::R1(A)
    • S(a);N_GUARD::R1(A),XS(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(D)::R(A)
      • Refutation
        • R(e);XQ(B)
  • Actual
    • R(A);
    • Vars
      • K(d);OGATEB,P-FLIGHT,XP(D)::QAR1(B)
      • K(d);S_FLIGHT,XR(A)::B(F)
      • R(e);N_GUARD,SBLOCK,XP(D)::QAR2(B)
      • S(a);N_GUARD,SBLOCK,XP(D)::S(G)
      • S(a);N_GUARD::R1(A),XS(a)
      • R(e);N_GUARD::QAB1(B),XR(e)
      • R(e);N_GUARD::QAB1(B)
      • R(e);N_GUARD,P_PINS(G)::QAB1(B)
      • S(a);N_GUARD::R1(A)
      • P(b);OGATE::QAB1(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).