MESON Chess Problem Database

Problem Display
PID: 128 (1BR1N1QK/4p3/1p2Np2/n2k4/B3n3/2p1R3/3qp3/bb6 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, Tijdschrift vd NSB, 1930

1BR1N1QK/4p3/1p2Np2/n2k4/B3n3/2p1R3/3qp3/bb6

#2

8 + 11

58 Tijdschrift vd NSB 1931
23 Die Schwalbe 2013
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sf4#
    • 1...Sb3
      • 2.Bxb3#
    • 1...Sc4
      • 2.Bc6#
    • 1...Sc6
      • 2.Bb3#
    • 1...Sb7
      • 2.Bb3#
  • Tries
    • 1.S6g7+?
      • 1...Kd4
        • 2.Sf5#
      • 1...e6!
    • 1.Sxf6+?
      • 1...Sxf6
        • 2.Re5#
      • 1...exf6!
    • 1.Bb3+?
      • 1...Sc4
        • 2.Bxc4#
      • 1...Sxb3!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qf5#
      • 1...Sc6
        • 2.Bb3#
      • 1...f5
        • 2.Qxf5#
      • 1...Qd4
        • 2.Sf4#
      • 1...Sf2
        • 2.Rd8#
      • 1...Sg3
        • 2.Rd8#
      • 1...Sc5
        • 2.S6c7#
      • 1...Sg5
        • 2.Rd8#
      • 1...Sd6
        • 2.S8c7#
      • 1...Sc4
        • 2.Bc6#
      • 1...c2
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(c);SBLOCK::QAB(G)+S(C),DCHECK
    • S(g);N_GUARD::B(B),XS(g)
    • S(g);N_GUARD,SBLOCK::B(B)
    • S(g);N_GUARD::B(B)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(h);P-FLIGHT::S(C)
      • Refutation
        • P(k);P_SPINP(k)
    • Try
      • S(F);CHECK,XP(j)
      • Vars
        • S(f);OGATE,XS(F)::R1(A)
      • Refutation
        • P(k);XS(F)
    • Try
      • B(B);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::B(B),XS(g)
      • Refutation
        • S(g);XB(B)
  • Actual
    • Q(G);
    • Threat
      • QAR2(G)
    • Vars
      • S(g);N_GUARD::B(B)
      • P(j);::QAR2(G),XP(j)
      • Q(c);SBLOCK::S(C)
      • S(f);N_GUARD::R(E)
      • S(f);SBLOCK::S(C)
      • S(f);SBLOCK::S(F)
      • S(g);N_GUARD,SBLOCK::B(B)
      • P(e);S_CUTB(b)::QAB1(G),XS(f)
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).