MESON Chess Problem Database

Problem Display
PID: 272622 (3K2R1/8/b1p1N3/8/rp1pR3/QB3kN1/2P2pp1/b4nr1 w - - 0 1)

Jonsson, Gustav

2nd HM., Schackvarlden, 1938

3K2R1/8/b1p1N3/8/rp1pR3/QB3kN1/2P2pp1/b4nr1

#2

8 + 11

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Rf4#
    • 1...Sxg3
      • 2.Sg5#
  • Tries
    • 1.Qc1?
      • threat
        • 2.Rf4#
        • 2.Qf4#
      • 1...Sxg3
        • 2.Sg5#
        • 2.Qf4#
      • 1...Se3
        • 2.Rf4#
      • 1...Sd2!
    • 1.Qxa1?
      • threat
        • 2.Sxd4#
      • 1...Sxg3
        • 2.Sg5#
      • 1...d3
        • 2.Sd4#
        • 2.Qf6#
        • 2.Qd1#
      • 1...c5!
  • Keys
    • 1.c4!
      • threat
        • 2.Bd1#
      • 1...Sxg3
        • 2.Sg5#
      • 1...bxc4 ep
        • 2.Qf8#
      • 1...dxc4 ep
        • 2.Sd4#
      • 1...Se3
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);SBLOCK::R1(E)
    • S(b);SBLOCK,XS(D)::S(F)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::R1(E)
      • Refutation
        • S(b);
    • Try
      • Q(B);XB(a)
      • Threat
        • S(F),XP(i)
      • Vars
        • S(b);SBLOCK,XS(D)::S(F)
      • Refutation
        • P(k);
  • Actual
    • P(A);
    • Threat
      • QAR(B)+B(C),DCHECK
    • Vars
      • S(b);SBLOCK,XS(D)::S(F)
      • P(h);EP,OGATE,XP(A)::QAR(B)
      • P(i);EP,S_CUTB(a),XP(A)::S(F)
      • S(b);SBLOCK::R1(E)
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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).