MESON Chess Problem Database

Problem Display
PID: 21972 (1B1K1n2/1pPnP3/R1Pk4/qR1p4/pP1p1p1b/5rrB/1N2Q3/8 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, Sydsvenska Dagbladet Snallposten, 1922

1B1K1n2/1pPnP3/R1Pk4/qR1p4/pP1p1p1b/5rrB/1N2Q3/8

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.c8S#
    • 1...Qxc7+
      • 2.Bxc7#
    • 1...Qxb5
      • 2.c8S#
    • 1...Rg5
      • 2.e8S#
    • 1...Bxe7+
      • 2.Qxe7#
    • 1...Sc5
      • 2.bxc5#
    • 1...Sb6
      • 2.c8Q#
      • 2.c8R#
    • 1...Sf6
      • 2.exf8Q#
      • 2.exf8B#
    • 1...Se6+
      • 2.Qxe6#
    • 1...Sg6
      • 2.Qe6#
    • 1...Sh7
      • 2.Qe6#
  • Tries
    • 1.Rxd5+?
      • 1...Qxd5
        • 2.c8S#
      • 1...Kxd5!
    • 1.Rab6?
      • threat
        • 2.c8S#
      • 1...Bxe7+
        • 2.Qxe7#
      • 1...Se6+
        • 2.Qxe6#
      • 1...Sxb6
        • 2.c8Q#
        • 2.c8R#
      • 1...Sc5
        • 2.bxc5#
        • 2.c8Q#
        • 2.c8S#
        • 2.c8B#
        • 2.c8R#
      • 1...Se5
        • 2.c8Q#
        • 2.c8S#
        • 2.c8B#
        • 2.c8R#
      • 1...Sf6
        • 2.c8Q#
        • 2.c8S#
        • 2.c8B#
        • 2.c8R#
        • 2.exf8Q#
        • 2.exf8B#
      • 1...Qxb6!
    • 1.cxd7+?
      • 1...Qb6
        • 2.Rbxb6#
        • 2.Raxb6#
      • 1...Qxa6
        • 2.c8Q#
        • 2.c8R#
      • 1...b6
        • 2.c8Q#
        • 2.c8R#
      • 1...bxa6!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qxd5#
      • 1...Qxc7+
        • 2.Bxc7#
      • 1...Bxe7+
        • 2.Qxe7#
      • 1...Se6+
        • 2.Qxe6#
      • 1...Qxb5
        • 2.c8S#
      • 1...dxe4
        • 2.Sc4#
      • 1...Sb6
        • 2.c8Q#
        • 2.c8R#
      • 1...Rg5
        • 2.e8S#
      • 1...Sc5
        • 2.bxc5#
      • 1...Sf6
        • 2.exf8Q#
        • 2.exf8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(g);N_PINP(H),P_PINP(I),XP(D)::P=S
    • Q(g);CHECK,OGATE,P_PINP(I),P_SPINQ(g),XP(H)::B(J),XQ(g)
    • Q(g);N_PINP(H),P_PINP(I),XR(E)::P=S
    • R(b);OGATE::P=S
    • B(f);CHECK,OGATE,XP(I)::QAB1(B),XB(f)
    • S(k);OGATE::P(D),XS(k)
    • S(k);N_PINP(H),P_PINP(I)::P=Q
    • S(k);OGATE::PXS(l)=Q
    • S(l);CHECK,N_GUARD::QAR1(B),XS(l)
    • S(l);N_GUARD::QAR1(B)
  • Tries
    • Try
      • R(E);CHECK,XP(h)
      • Vars
        • Q(g);N_PINP(H),P_PINP(I),SBLOCK,XR(E)::P=S
      • Refutation
        • K(i);P-FLIGHT,XR(E)
    • Try
      • R(F);N_SPINP(H),P_SPINP(I)
      • Threat
        • P=S
      • Vars
        • B(f);CHECK,OGATE,XP(I)::QAB1(B),XB(f)
        • S(l);CHECK,N_GUARD::QAR1(B),XS(l)
        • S(k);N_GUARD,XR(F)::P=Q
      • Refutation
        • Q(g);N_PINP(I),P_PINP(H),XR(F)
    • Try
      • P(G);CHECK,XS(k)
      • Vars
        • Q(g);N_PINP(H),P_PINP(I),XR(F)::P=Q
        • P(j);N_PINP(H),P_PINP(I),P_SPINP(j)::P=Q
      • Refutation
        • P(j);XR(F)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XP(h)
    • Vars
      • Q(g);CHECK,OGATE,P_PINP(I),P_SPINQ(g),XP(H)::B(J),XQ(g)
      • B(f);CHECK,OGATE,XP(I)::QAB1(B),XB(f)
      • S(l);CHECK,N_GUARD::QAR1(B),XS(l)
      • Q(g);N_PINP(H),P_PINP(I),XR(E)::P=S
      • P(h);N_GUARD,XQ(B)::S(A)
      • S(k);N_PINP(H),P_PINP(I)::P=Q
      • R(b);OGATE::P=S
      • S(k);OGATE::P(D),XS(k)
      • S(k);OGATE::PXS(l)=Q
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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).