MESON Chess Problem Database

Problem Display
PID: 6173 (1K6/N2p2R1/1nbk1B2/2p2P2/2p1p1P1/2Nq4/r6b/2QR4 w - - 0 1)

Katzenellenbogen, Israel Davidovich

4th Prize, Sev. Zap. Obl., 1927

1K6/N2p2R1/1nbk1B2/2p2P2/2p1p1P1/2Nq4/r6b/2QR4

#2

9 + 10

721 Variantim 1990

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Sxe4#
    • 1...Bg1
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Be5
      • 2.Be7#
    • 1...Bd5
      • 2.Scb5#
    • 1...Sa4
      • 2.Sc8#
    • 1...Sd5
      • 2.Sc8#
    • 1...Sa8
      • 2.Sc8#
    • 1...Sc8
      • 2.Sxc8#
  • Keys
    • 1.Qh6!
      • threat
        • 2.Bd4#
      • 1...Qd2
        • 2.Qxh2#
      • 1...Qd4
        • 2.Bxd4#
      • 1...Qd5
        • 2.Sxe4#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Be5
        • 2.Be7#
      • 1...Bd5
        • 2.Scb5#
      • 1...Sd5
        • 2.Sc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(c);S_CUTB(h)::S(C),XP(e)
    • B(b);N_GUARD::QAB(A)
    • B(b);N_GUARD::QAB(A),XB(b)
    • B(b);SBLOCK::B(F)
    • B(h);N_GUARD,N_SPINQ(c),SBLOCK::S(C)
    • S(g);N_GUARD::S(G)
    • S(g);N_GUARD,N_SPINQ(c)::S(G)
    • S(g);N_GUARD::S(G),XS(g)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+B(F)
    • Vars
      • Q(c);S_CUTR(a)::QAB(A),XB(b)
      • Q(c);::QAR(A)+B(F),XQ(c)
      • Q(c);S_CUTB(h)::S(C),XP(e)
      • B(b);N_GUARD::QAB(A),XB(b)
      • B(b);SBLOCK::QAR(A)+B(F),DCHECK
      • B(h);N_GUARD,N_SPINQ(c),SBLOCK::S(C)
      • S(g);N_GUARD,N_SPINQ(c)::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).