MESON Chess Problem Database

Problem Display
PID: 11280 (2n1N2b/4Q3/1p2K3/r3npp1/1pp1kP1R/q1R2N1p/8/2BB1br1 w - - 0 1)

Larsen, Karl Adolf Koefoed

Skakbladet, 1937

2n1N2b/4Q3/1p2K3/r3npp1/1pp1kP1R/q1R2N1p/8/2BB1br1

#2

9 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Re3#
    • 1...Qa1
      • 2.Re3#
    • 1...Qa2
      • 2.Re3#
    • 1...Qa4
      • 2.Re3#
    • 1...Bf6
      • 2.Sxf6#
    • 1...Sd6
      • 2.Sxd6#
    • 1...Sa7
      • 2.Sd6#
    • 1...Sxe7
      • 2.Sd6#
    • 1...b3
      • 2.Re3#
    • 1...gxf4
      • 2.Rxf4#
  • Tries
    • 1.Qb7+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sc6!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxf5#
      • 1...Bxf6
        • 2.Sxf6#
      • 1...Sxf3
        • 2.Bxf3#
      • 1...Sd3
        • 2.Rxc4#
      • 1...Sg4
        • 2.Sxg5#
      • 1...Sc6
        • 2.Sd2#
      • 1...Sg6
        • 2.Sd2#
      • 1...Sd7
        • 2.Sd2#
      • 1...Sf7
        • 2.Sd2#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Se7
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 7
  • Sets
    • Q(c);N_GUARD::R1(C)
    • B(n);N_GUARD::S(I),XB(n)
    • S(m);N_GUARD::S(I),XS(m)
    • S(m);N_GUARD::S(I)
    • S(m);N_GUARD,XQ(H)::S(I)
    • P(e);S_CUTQ(c)::R1(C)
    • P(k);OGATE,P_SPINP(k),XP(E)::R1(F),XP(k)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAB1(H),XR(h)
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H),XP(j)
    • Vars
      • B(n);XQ(H)::S(I),XB(n)
      • S(i);OGATE,XS(D)::B(B),XS(i)
      • S(i);N_GUARD,SBLOCK,S_CUTB(a)::R(C),XP(f)
      • S(i);S_CUTR(b)::S(D),XP(k)
      • S(i);::S(D)
      • S(m);N_GUARD::S(I),XS(m)
      • S(m);N_GUARD::S(I)
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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).