MESON Chess Problem Database

Problem Display
PID: 18707 (8/Bqn5/pr3N1K/2kBP2p/QN1p1n1r/3p4/8/4bb2 w - - 0 1)

Larsen, Karl Adolf Koefoed

4th HM., Szachy, 1957

8/Bqn5/pr3N1K/2kBP2p/QN1p1n1r/3p4/8/4bb2

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Sxd3#
    • 1...Sfe6
      • 2.Sd7#
    • 1...Sg6
      • 2.Sd7#
    • 1...Sce6
      • 2.Se4#
      • 2.Qa5#
    • 1...Sa8
      • 2.Qa5#
    • 1...Se8
      • 2.Qa5#
  • Tries
    • 1.Sxd3+?
      • 1...Sxd3
        • 2.Qc4#
      • 1...Bxd3!
    • 1.Sxa6+?
      • 1...Sxa6
        • 2.Qc4#
      • 1...Qxa6!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qc4#
      • 1...Sfxd5
        • 2.Sd7#
      • 1...Scxd5
        • 2.Se4#
      • 1...Bb4
        • 2.Qxb4#
      • 1...d2
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(e);N_GUARD,S_CUTB(b)::S(B),XP(c)
    • S(e);N_PINS(E)::S(E)
    • S(l);N_GUARD::QAR2(A)
  • Tries
    • Try
      • S(B);CHECK,XP(c)
      • Vars
        • S(e);XS(B)::QAR1(A)
      • Refutation
        • B(b);XS(B)
    • Try
      • S(B);CHECK,XP(i)
      • Vars
        • S(l);XS(B)::QAR1(A)
      • Refutation
        • Q(k);XS(B)
  • Actual
    • S(B);N_SPINS(E)
    • Threat
      • QAR1(A)
    • Vars
      • S(e);SBLOCK,XB(C)::S(E)
      • S(l);SBLOCK,XB(C)::S(E)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • P(c);S_CUTB(a)::QAB1(A)
HTML5 logo

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).