MESON Chess Problem Database

Problem Display
PID: 93214 (4B3/5rpK/PNN1b1R1/PPk1P3/4R3/7p/1Q3b2/1qr5 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, DSK 13. TT, 1938

4B3/5rpK/PNN1b1R1/PPk1P3/4R3/7p/1Q3b2/1qr5

#2

11 + 8

15593 170 Skakopgaver (Jorgensen) 1975
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qb4#
    • 1...Qc2
      • 2.Qb4#
    • 1...Qd3
      • 2.Qb4#
    • 1...Qa1
      • 2.Qb4#
    • 1...Bd5
      • 2.Sa4#
  • Tries
    • 1.Qa3+?
      • 1...Qb4
        • 2.Qxb4#
      • 1...Kxb5!
  • Keys
    • 1.Sd8!
      • threat
        • 2.Sxe6#
      • 1...Qa2
        • 2.Qb4#
      • 1...Rf6
        • 2.Sb7#
      • 1...Re7
        • 2.Qxf2#
      • 1...Ba2
        • 2.Rc6#
      • 1...Bb3
        • 2.Qa3#
      • 1...Bc4
        • 2.Rc6#
      • 1...Bg4
        • 2.Rc6#
      • 1...Bd5
        • 2.Sa4#
      • 1...Bf5
        • 2.Qxf2#
      • 1...Bd7
        • 2.Sb7#
      • 1...Bc8
        • 2.Rc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::QAB1(A)
    • B(f);SBLOCK::S(G)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB1(A),XQ(a)
      • Refutation
        • K(e);P-FLIGHT,XP(D)
  • Actual
    • S(H);
    • Threat
      • S(H),XB(f)
    • Vars
      • Q(a);N_GUARD::QAB1(A)
      • R(g);N_GUARD::S(H)
      • R(g);N_GUARD::QAB(A),XB(c)
      • B(f);OGATE::R1(I)
      • B(f);S_CUTQ(a)::QAB(A)
      • B(f);SBLOCK::S(G)
      • B(f);P_PINR(I),S_CUTR(g)::QAB(A),XB(c)
      • B(f);S_CUTR(g)::S(H)
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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).