MESON Chess Problem Database

Problem Display
PID: 237799 (N3b2K/1p4p1/kB5p/1pp3r1/1nQR4/6qr/2N5/5B2 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Arbejder-Skak, 1948

N3b2K/1p4p1/kB5p/1pp3r1/1nQR4/6qr/2N5/5B2

#2

7 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bh5
      • 2.Qxb5#
    • 1...Bg6
      • 2.Qxb5#
    • 1...Bf7
      • 2.Qxb5#
    • 1...Sa2
      • 2.Qa4#
    • 1...Sxc2
      • 2.Qa4#
    • 1...Sd3
      • 2.Qa2#
    • 1...Sd5
      • 2.Qa4#
    • 1...Sc6
      • 2.Qxb5#
    • 1...cxd4
      • 2.Sxb4#
  • Tries
    • 1.Qa2+?
      • 1...Sxa2
        • 2.Ra4#
      • 1...Qa3!
  • Keys
    • 1.Qxc5!
      • threat
        • 2.Sxb4#
      • 1...Sxc2
        • 2.Ra4#
      • 1...Qe1
        • 2.Sc7#
      • 1...Qa3
        • 2.Sc7#
      • 1...Qb3
        • 2.Sc7#
      • 1...Qc3
        • 2.Sc7#
      • 1...Sa2
        • 2.Ra4#
      • 1...Sd3
        • 2.Qa3#
      • 1...Sd5
        • 2.Ra4#
      • 1...Sc6
        • 2.Bxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(k);N_GUARD,SBLOCK::QAB1(C),XP(d)
    • B(k);N_GUARD::QAB1(C),XP(d)
    • S(c);OGATE::QAR2(C)
    • S(c);OGATE,XS(B)::QAR2(C)
    • S(c);N_GUARD,S_CUTQ(a)::QAR(C)
    • S(c);S_CUTB(k)::QAB1(C),XP(d)
    • P(e);N_GUARD,XR(D)::S(B),XS(c)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • S(c);OGATE,XQ(C)::R(D)
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • Q(C);XP(e)
    • Threat
      • S(B),XS(c)
    • Vars
      • S(c);OGATE,XS(B)::R(D)
      • Q(a);N_GUARD::S(F)
      • S(c);OGATE::R(D)
      • S(c);N_SPINP(d),OGATE::QAR(C)
      • S(c);S_CUTB(k)::B(A),XP(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).