MESON Chess Problem Database

Problem Display
PID: 21843 (b7/3pN3/7p/3P1P1r/RK1kBQ2/ppnP1P2/rn6/Bq1R1N2 w - - 0 1)

Larsen, Karl Adolf Koefoed

3rd HM.=, 8. American Chess Congress, 1921

b7/3pN3/7p/3P1P1r/RK1kBQ2/ppnP1P2/rn6/Bq1R1N2

#2

12 + 11

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Sxf5#
    • 1...Sxd3+
      • 2.Bxd3#
    • 1...Sc4
      • 2.Bxc3#
    • 1...Sxe4
      • 2.Qxe4#
    • 1...Sxd5+
      • 2.Bxd5#
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qf6#
      • 1...Sxd3+
        • 2.Ka5#
      • 1...Sxd5+
        • 2.Kxb3#
      • 1...Rxf5
        • 2.Sxf5#
      • 1...Sxe4
        • 2.Kxb3#
      • 1...Sc4
        • 2.Bxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(h);XP(K)::S(L),XR(h)
    • S(c);CHECK,OGATE,P_SPINS(f),XP(D)::QAR(I)+B(H),XS(c)
    • S(c);OGATE,P_SPINS(f)::B(A),XS(f)
    • S(f);OGATE,P_SPINS(c),XB(H)::QAR1(I),XS(f)
    • S(f);CHECK,OGATE,P_SPINS(c),XP(J)::QAR(I)+B(H),XS(f)
  • Actual
    • Q(I);
    • Threat
      • QAB(I)
    • Vars
      • S(c);CHECK,N_GUARD,P_SPINS(f),XP(D)::R(F)+K(G)
      • S(f);CHECK,N_GUARD,P_SPINS(c),XP(J)::R(F)+K(G),XP(e)
      • R(h);XP(K)::S(L),XR(h)
      • S(f);N_GUARD,P_SPINS(c),XB(H)::R(F)+K(G),XP(e)
      • S(c);OGATE,P_SPINS(f)::B(A),XS(f)
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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).