MESON Chess Problem Database

Problem Display
PID: 6347 (3K4/N5BB/r1P5/3PR1P1/1Pbk3N/p1b3q1/Q2PRn2/4nr2 w - - 0 1)

Larsen, Karl Adolf Koefoed

3rd Prize, Tijdschrift vd NSB, 1928

3K4/N5BB/r1P5/3PR1P1/1Pbk3N/p1b3q1/Q2PRn2/4nr2

#2

13 + 9

20 De Problemist 1929
1397 Faszinierendes Schachproblem 1963

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Rf5#
    • 1...Qe3
      • 2.dxe3#
    • 1...Qxg5+
      • 2.Rxg5#
    • 1...Rxc6
      • 2.Sxc6#
    • 1...Bd3
      • 2.R5e4#
    • 1...Bb5
      • 2.Sxb5#
    • 1...Bxd5
      • 2.Sb5#
      • 2.Rxd5#
      • 2.Qxd5#
    • 1...Sed3
      • 2.Sf5#
    • 1...Sfd3
      • 2.R2e4#
  • Tries
    • 1.R5e4+?
      • 1...Kd3
        • 2.R4e3#
      • 1...Kxd5!
    • 1.Rf5+?
      • 1...Kd3
        • 2.Rfxf2#
      • 1...Qe5!
  • Keys
    • 1.d3!
      • threat
        • 2.Qxc4#
      • 1...Qxg5+
        • 2.Rxg5#
      • 1...Qxd3
        • 2.Rf5#
      • 1...Rxc6
        • 2.Sxc6#
      • 1...Bxa2
        • 2.Sb5#
      • 1...Bxd3
        • 2.R5e4#
      • 1...Bxd5
        • 2.Sb5#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Sexd3
        • 2.Sf5#
      • 1...Sfxd3
        • 2.R2e4#
      • 1...Bb3
        • 2.Sb5#
      • 1...Bb5
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD,SBLOCK::B(K)+R(G)
    • Q(f);OGATE::P(B),XQ(f)
    • Q(f);CHECK,OGATE,XP(H)::B(K)+R(G),XQ(f)
    • R(i);XP(I)::S(J),XR(i)
    • B(g);SBLOCK::B(K)+R(G),DCHECK
    • B(g);N_GUARD::S(J),XB(g)
    • S(a);SBLOCK::S(E)
    • S(c);N_GUARD,SBLOCK::R1(C)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(h);P-FLIGHT::B(L)+R(G),DCHECK
      • Refutation
        • K(h);P-FLIGHT,P_SPINB(g),XP(F)
    • Try
      • R(G);CHECK
      • Vars
        • K(h);P-FLIGHT::B(L)+R(G),XS(c)
      • Refutation
        • Q(f);P_SPINQ(f)
  • Actual
    • P(B);
    • Threat
      • QAR1(A),XB(g)
    • Vars
      • Q(f);CHECK,OGATE,XP(H)::B(K)+R(G),XQ(f)
      • Q(f);N_GUARD,SBLOCK,XP(B)::B(K)+R(G)
      • R(i);XP(I)::S(J),XR(i)
      • B(g);N_GUARD,XQ(A)::S(J)
      • B(g);SBLOCK,XP(B)::B(K)+R(G),DCHECK
      • S(a);SBLOCK,XP(B)::S(E)
      • S(c);N_GUARD,SBLOCK,XP(B)::R1(C)
      • B(g);N_GUARD::S(J)
      • B(g);N_GUARD::S(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).