MESON Chess Problem Database

Problem Display
PID: 241418 (3bK3/2prn1B1/4N3/q6p/1nP1k3/p3p1PB/2b1Q2N/8 w - - 0 1)

Hjelle, David

Arbejder-Skak, 1950

3bK3/2prn1B1/4N3/q6p/1nP1k3/p3p1PB/2b1Q2N/8

#2

8 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Sg5#
    • 1...Qa4
      • 2.Sc5#
      • 2.Sg5#
    • 1...Qc5
      • 2.Sxc5#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Qa6
      • 2.Sc5#
      • 2.Sg5#
    • 1...Qa7
      • 2.Sg5#
    • 1...Qa8
      • 2.Sc5#
      • 2.Sg5#
    • 1...Rd3
      • 2.Qf3#
      • 2.Qg2#
    • 1...Bd3
      • 2.Qf3#
      • 2.Qg2#
    • 1...Sd3
      • 2.Qf3#
      • 2.Qg2#
    • 1...Sbd5
      • 2.Sg5#
      • 2.Qxc2#
    • 1...Sf5
      • 2.Bg2#
    • 1...c5
      • 2.Sg5#
  • Tries
    • 1.Qxc2+?
      • 1...Rd3
        • 2.Qg2#
      • 1...Sd3
        • 2.Qg2#
      • 1...Sxc2!
  • Keys
    • 1.Sf1!
      • threat
        • 2.Qxe3#
      • 1...Qb6
        • 2.Sg5#
      • 1...Qc5
        • 2.Sxc5#
      • 1...Qg5
        • 2.Sxg5#
      • 1...Qa7
        • 2.Sg5#
      • 1...Rd3
        • 2.Qg2#
      • 1...Sbd5
        • 2.Sg5#
      • 1...Sed5
        • 2.Sd2#
      • 1...Sf5
        • 2.Bg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD::S(F)
    • Q(f);N_GUARD::S(F),XQ(f)
    • S(j);SBLOCK::B(D)
    • P(h);S_CUTQ(f)::S(F)
  • Tries
    • Try
      • Q(A);CHECK,N_PINP(c),XB(a)
      • Vars
        • R(i);P_SPINR(i),SBLOCK::QAB(A)
        • S(d);P_SPINS(d),SBLOCK::QAB(A)
      • Refutation
        • S(d);XQ(A)
  • Actual
    • S(B);
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • Q(f);N_GUARD::S(F)
      • Q(f);N_GUARD::S(F),XQ(f)
      • R(i);SBLOCK::QAB(A)
      • S(d);S_CUTQ(f)::S(F)
      • S(j);S_CUTR(i)::S(B)
      • S(j);SBLOCK::B(D)
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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).