MESON Chess Problem Database

Problem Display
PID: 140049 (4Q1K1/1p4pp/1B5r/4N3/2PPBRP1/Rq1bk1P1/3pp3/2nnb3 w - - 0 1)

Krelenbaum, Szaja

Die Schwalbe, 1938

4Q1K1/1p4pp/1B5r/4N3/2PPBRP1/Rq1bk1P1/3pp3/2nnb3

#2

11 + 12

56 The Problemist 1938

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4+
      • 2.Sxc4#
    • 1...Bxc4+
      • 2.Sxc4#
  • Keys
    • 1.Sg6!
      • threat
        • 2.Rf3#
      • 1...Qxc4+
        • 2.Bd5#
      • 1...Bxc4+
        • 2.d5#
      • 1...Qxb6
        • 2.Bc6#
      • 1...Bxe4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(f);CHECK,P_SPINB(g),XP(C)::S(H),XQ(f)
    • B(g);CHECK,P_SPINQ(f),XP(C)::S(H),XB(g)
  • Actual
    • S(H);
    • Threat
      • R1(F)
    • Vars
      • Q(f);CHECK,P_SPINB(g),XP(C)::QAR(J)+B(E)
      • B(g);CHECK,P_SPINQ(f),XP(C)::B(I)+P(D)
      • Q(f);N_PINP(C),P_SPINB(g),XB(I)::QAR(J)+B(E)
      • B(g);OGATE,P_SPINB(g),P_SPINQ(f),XB(E)::QAR1(J),XB(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).