MESON Chess Problem Database

Problem Display
PID: 139235 (7B/2Q3N1/4n1B1/1qb4R/1rNk4/R1n5/4b3/6K1 w - - 0 1)

de Szasz, L

La Liberte, 1928

7B/2Q3N1/4n1B1/1qb4R/1rNk4/R1n5/4b3/6K1

#2

8 + 7

56 The Problemist 1937

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4
      • 2.Qe5#
    • 1...Rxc4
      • 2.Qe5#
    • 1...Bxc4
      • 2.Qe5#
    • 1...Bb6
      • 2.Sxe6#
    • 1...Bd6
      • 2.Sxe6#
    • 1...Ba7
      • 2.Sxe6#
    • 1...Be7
      • 2.Sxe6#
    • 1...Bf8
      • 2.Sxe6#
  • Tries
    • 1.Qf4+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Sxf4!
  • Keys
    • 1.Sf5+!
      • 1...Kd3+
        • 2.Sfe3#
      • 1...Kxc4+
        • 2.Se3#
      • 1...Ke4+
        • 2.Sd4#
      • 1...Kd5+
        • 2.Sfe3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(e);SBLOCK,XS(C)::QAB1(F)
    • R(c);SBLOCK,XS(C)::QAB1(F)
    • B(a);SBLOCK,XS(C)::QAB1(F)
    • B(f);::B(H)+S(G),DCHECK,XS(g)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(F),XS(b)
      • Refutation
        • S(g);XQ(F)
  • Actual
    • S(G);CHECK
    • Vars
      • K(d);CHECK,P-FLIGHT,P_SPINS(b)::B(E)+S(G)
      • K(d);CHECK,P-FLIGHT,P_SPINB(f),XS(C)::S(G)
      • K(d);CHECK,P-FLIGHT::B(E)+S(G)
      • K(d);CHECK,P-FLIGHT::R(D)+S(G),DCHECK
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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).