MESON Chess Problem Database

Problem Display
PID: 259414 (4K3/1n2Rp1n/2pP4/2p1PP2/2N1kN2/2p1Pp1Q/B1P5/8 w - - 0 1)

Lubton, Yehuda

Shahmat, 1979

4K3/1n2Rp1n/2pP4/2p1PP2/2N1kN2/2p1Pp1Q/B1P5/8

#2

11 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd6+
      • 2.exd6#
    • 1...Sf6+
      • 2.exf6#
    • 1...f6
      • 2.exf6#
  • Tries
    • 1.Qxh7?
      • threat
        • 2.f6#
      • 1...Sxd6+
        • 2.exd6#
      • 1...f6
        • 2.exf6#
      • 1...f2!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sxc3#
      • 1...Sxd6+
        • 2.Sxd6#
      • 1...Sf6+
        • 2.Sxf6#
      • 1...Kxd5
        • 2.Qxf3#
      • 1...cxd5
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(f);CHECK,OGATE,XP(I)::R(J)+P(G),XS(f)
    • S(h);CHECK,OGATE::R(J)+P(G),XS(h)
    • P(g);OGATE::R(J)+P(G),XP(g)
  • Tries
    • Try
      • Q(D);XS(h)
      • Threat
        • QAB(D)+P(H)
      • Vars
        • S(f);CHECK,OGATE,XP(I)::R(J)+P(G),XS(f)
        • P(g);OGATE::R(J)+P(G),XP(g)
      • Refutation
        • P(b);
  • Actual
    • S(F);
    • Threat
      • S(F),XP(a)
    • Vars
      • S(f);CHECK,XP(I)::S(E),XS(f)
      • S(h);CHECK,N_GUARD::S(F),XS(h)
      • K(c);N_GUARD,S_FLIGHT,XS(F)::QAB(D),XP(b)
      • P(e);SBLOCK,XS(F)::QAR2(D)
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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).