MESON Chess Problem Database

Problem Display
PID: 21683 (8/1rnbp3/6QK/2k1B3/1N5R/8/4BR2/8 w - - 0 1)

Larsen, Karl Adolf Koefoed

1st Prize, Good Companions (March Meredith Ty.), 1920

8/1rnbp3/6QK/2k1B3/1N5R/8/4BR2/8

#2

7 + 5

3132 The Good Companion Two-Mover 1922
3310 2345 Chess Problems 1997
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Rc4#
    • 1...Bh3
      • 2.Qc6#
    • 1...Bf5
      • 2.Qc6#
    • 1...Bc6
      • 2.Qxc6#
    • 1...Bc8
      • 2.Qc6#
    • 1...Sb5
      • 2.Rc4#
    • 1...Sd5
      • 2.Sa6#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Bf3#
        • 2.Rd4#
      • 1...Kb5!
  • Keys
    • 1.Rf5!
      • threat
        • 2.Qg1#
      • 1...Rxb4
        • 2.Bd4#
      • 1...Se6
        • 2.Bc7#
      • 1...Rb6
        • 2.Bd6#
      • 1...Sb5
        • 2.Rc4#
      • 1...Sd5
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(b);SBLOCK::R1(D)
    • B(d);N_GUARD::QAR1(F)
    • B(d);N_GUARD::QAR1(F),XB(d)
    • S(c);SBLOCK::R1(D)
    • S(c);N_GUARD,SBLOCK::S(C)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(B);
    • Threat
      • QAB(F)
    • Vars
      • R(b);SBLOCK,XS(C)::R(B)+B(E),DCHECK
      • S(c);S_CUTB(d),S_CUTP(e)::R(B)+B(E)
      • R(b);P_PINQ(F),SBLOCK::R(B)+B(E),DCHECK
      • S(c);SBLOCK::R1(D)
      • S(c);N_GUARD,SBLOCK::S(C)
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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).