MESON Chess Problem Database

Problem Display
PID: 21656 (2NRb3/3B4/K4p2/bPpkrn1R/5Qp1/4P3/1P4N1/8 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize Set, 02. Mansfield Test - Good Companions (May), 1920

2NRb3/3B4/K4p2/bPpkrn1R/5Qp1/4P3/1P4N1/8

#2

10 + 8

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

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe3
      • 2.Sxe3#
    • 1...Re6+
      • 2.Bc6#
    • 1...Re7
      • 2.Sxe7#
    • 1...Sxe3
      • 2.Sxe3#
    • 1...Sd6
      • 2.Se7#
  • Tries
    • 1.Bxf5+?
      • 1...Bd7
        • 2.Rxd7#
      • 1...Bxd8!
  • Keys
    • 1.b3!
      • threat
        • 2.Qc4#
      • 1...Re6+
        • 2.Bc6#
      • 1...Rxe3
        • 2.Sxe3#
      • 1...Sxe3
        • 2.Sxe3#
      • 1...c4
        • 2.Qxc4#
      • 1...Re4
        • 2.Qd6#
      • 1...Re7
        • 2.Sxe7#
      • 1...Sd4
        • 2.e4#
      • 1...Sd6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(e);P_SPINS(f),XP(C)::S(B),XR(e)
    • R(e);CHECK,P_SPINS(f),SBLOCK::R(J)+B(H),DCHECK
    • R(e);N_GUARD,P_SPINS(f)::S(I),XR(e)
    • S(f);P_SPINR(e),XP(C)::S(B),XS(f)
    • S(f);N_GUARD,P_SPINR(e),SBLOCK::S(I)
  • Tries
    • Try
      • B(H);CHECK,XS(f)
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::R(J),XB(h)
      • Refutation
        • B(b);XR(J)
  • Actual
    • P(A);
    • Threat
      • QAB1(D)
    • Vars
      • R(e);CHECK,P_SPINS(f),SBLOCK::R(J)+B(H),DCHECK
      • R(e);P_SPINS(f),XP(C)::S(B),XR(e)
      • S(f);P_SPINR(e),XP(C)::S(B),XS(f)
      • P(c);::QAB1(D),XP(c)
      • R(e);OGATE,P_SPINS(f),SBLOCK::QAR1(D)
      • R(e);N_GUARD,P_SPINS(f)::S(I),XR(e)
      • S(f);P_SPINR(e),SBLOCK::P(C)
      • S(f);N_GUARD,P_SPINR(e),SBLOCK::S(I)
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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).