MESON Chess Problem Database

Problem Display
PID: 273418 (BR5K/2R1B3/2r1n3/2n2Q2/r1k5/2N1P3/P7/3N3b w - - 0 1)

Karlsson, Borje

Schackvarlden, 1935

BR5K/2R1B3/2r1n3/2n2Q2/r1k5/2N1P3/P7/3N3b

#2

10 + 6

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Qf1#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Sb3
      • 2.Qf1#
      • 2.Qb5#
      • 2.axb3#
    • 1...Sd3
      • 2.Qb5#
    • 1...Se4
      • 2.Qf1#
      • 2.Qb5#
      • 2.Qd5#
    • 1...Sa6
      • 2.Qf1#
      • 2.Qb5#
    • 1...Sb7
      • 2.Qf1#
      • 2.Qb5#
    • 1...Sd7
      • 2.Qf1#
      • 2.Qb5#
  • Tries
    • 1.Sxa4?
      • threat
        • 2.Sdb2#
        • 2.Sab2#
      • 1...Sxa4
        • 2.Rb4#
        • 2.Qb5#
      • 1...Sd3
        • 2.Sb6#
        • 2.Qb5#
      • 1...Rb6!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sb2#
      • 1...Rxa2
        • 2.Rb4#
      • 1...Bxd5
        • 2.Qc2#
      • 1...Rb6
        • 2.Qf1#
      • 1...Sb7
        • 2.Sb6#
      • 1...Rb4
        • 2.Rxb4#
      • 1...Sd3
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(e);P_SPINS(d)::QAB(E)
    • B(a);N_GUARD::QAB1(E),XB(a)
    • S(d);OGATE,P_SPINR(e),SBLOCK::QAB1(E)
  • Tries
    • Try
      • S(C);XR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • R(e);P_SPINS(d)
  • Actual
    • S(C);
    • Threat
      • S(A)
    • Vars
      • R(b);N_GUARD,XP(B)::R1(I)
      • B(a);SBLOCK,XS(C)::QAR2(E)
      • R(e);P_SPINS(d)::QAB(E)
      • S(d);P_SPINR(e)::S(C)
      • R(b);N_GUARD::R1(I),XR(b)
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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).