MESON Chess Problem Database

Problem Display
PID: 18856 (Q7/1p6/3pK3/N2B4/kqp1R3/N2p4/2b5/R7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Tidskrift for Schack, 1958

Q7/1p6/3pK3/N2B4/kqp1R3/N2p4/2b5/R7

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Sc6#
    • 1...Qb5
      • 2.Sxc2#
    • 1...c3
      • 2.Sb3#
      • 2.Sc6#
      • 2.Sxb7#
  • Tries
    • 1.S3xc4+?
      • 1...Qa3
        • 2.Sxa3#
        • 2.Sxd6#
      • 1...Kb5!
    • 1.S5xc4+?
      • 1...Qa5
        • 2.Sb2#
        • 2.Sd2#
        • 2.Se3#
        • 2.Sxa5#
        • 2.Se5#
        • 2.Sb6#
        • 2.Sxd6#
      • 1...Kb3!
    • 1.Qe8+?
      • 1...Kxa5
        • 2.Sxc4#
      • 1...Qb5
        • 2.Sxc2#
        • 2.Qxb5#
      • 1...b5!
  • Keys
    • 1.Bxc4!
      • threat
        • 2.Bb5#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Qxa3
        • 2.Sc6#
        • 2.Bxd3#
      • 1...Qxa5
        • 2.Sxc2#
        • 2.Bd5#
      • 1...Qb3
        • 2.Sc6#
        • 2.Bxb3#
      • 1...Qb5
        • 2.Sxc2#
        • 2.Bb3#
        • 2.Bxb5#
      • 1...Bb3
        • 2.Bxb3#
      • 1...b5
        • 2.Bxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(d);N_GUARD,P_SPINP(e),SBLOCK::QAR(G)+S(D)
    • Q(d);N_GUARD,P_SPINP(e),SBLOCK::R(A)+S(B),XB(a)
  • Tries
    • Try
      • S(B);CHECK,XP(e)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(D);CHECK,XP(e)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);P-FLIGHT,XS(D)::R(A)+S(B),DCHECK,XP(e)
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • B(E);XP(e)
    • Threat
      • B(E)
    • Vars
      • Q(d);CHECK,OGATE,P_SPINQ(d),XB(E)::R(C),XQ(d)
      • B(a);N_GUARD,P_PINB(E)::B(E),XB(a)
      • P(g);::B(E),XP(g)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).