MESON Chess Problem Database

Problem Display
PID: 64533 (2B2Rbr/5n2/2NB2p1/1pK1Nqpp/3p1kp1/Q4P2/7P/1r6 w - - 0 1)

Larsen, Karl Adolf Koefoed

2nd Prize, Good Companions (July), 1920

2B2Rbr/5n2/2NB2p1/1pK1Nqpp/3p1kp1/Q4P2/7P/1r6

#2

9 + 12

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2+
      • 2.Sc4#
    • 1...Qe4
      • 2.Sxg6#
    • 1...Qxe5+
      • 2.Bxe5#
    • 1...Qf6
      • 2.Sxg6#
    • 1...Rc1+
      • 2.Qxc1#
    • 1...Rb4
      • 2.Qc1#
    • 1...Sxe5
      • 2.Bxe5#
    • 1...gxf3
      • 2.Qxf3#
  • Keys
    • 1.Se7!
      • threat
        • 2.Sd5#
      • 1...Qc2+
        • 2.Sc4#
      • 1...Qxc8+
        • 2.S5c6#
      • 1...Rc1+
        • 2.Qxc1#
      • 1...Sxe5
        • 2.Sxg6#
      • 1...Sxd6
        • 2.Sxg6#
      • 1...gxf3
        • 2.Qxf3#
      • 1...Qe4
        • 2.S5xg6#
      • 1...Qe6
        • 2.S5xg6#
      • 1...Qd7
        • 2.S5xg6#
        • 2.Sxd7#
      • 1...Sh6
        • 2.Sxg6#
      • 1...Sd8
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(f);CHECK,N_PINS(E),P_SPINS(j)::B(G)+S(E)
    • Q(f);N_PINS(E),P_SPINS(j)::B(G)+S(E),DCHECK,XP(i)
    • Q(f);CHECK,OGATE,P_SPINQ(f),P_SPINS(j),XS(E)::B(G),XQ(f)
    • Q(f);N_PINS(E)::B(G)+S(E),DCHECK,XP(i)
    • R(a);CHECK,N_GUARD::QAB(B),XR(a)
    • R(a);N_GUARD::QAB(B)
    • S(j);OGATE,P_SPINQ(f),P_SPINS(j),XS(E)::B(G),XS(j)
    • P(d);OGATE,XP(C)::QAR1(B),XP(d)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(f);CHECK,N_PINS(E),P_SPINS(j)::B(G)+S(E)
      • Q(f);CHECK,N_PINS(E),P_SPINS(j),XB(H)::B(G)+S(E)
      • R(a);CHECK,N_GUARD::QAB(B),XR(a)
      • S(j);P_SPINQ(f),P_SPINS(j),XS(E)::S(F),XP(i)
      • S(j);P_SPINQ(f),XB(G)::S(F),XP(i)
      • P(d);OGATE,XP(C)::QAR1(B),XP(d)
      • Q(f);N_PINS(E),P_SPINS(j)::B(G)+S(E),DCHECK,XP(i)
      • S(j);P_SPINQ(f)::S(F),XP(i)
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).