MESON Chess Problem Database

Problem Display
PID: 240647 (5K2/3p4/2pQ2p1/2pnn3/2Pk1NR1/3Pp3/4Pq2/4B1N1 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1982

5K2/3p4/2pQ2p1/2pnn3/2Pk1NR1/3Pp3/4Pq2/4B1N1

#2

9 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg1
      • 2.Se6#
    • 1...Qg3
      • 2.Se6#
    • 1...Qh4
      • 2.Se6#
    • 1...Qxe2
      • 2.Sgxe2#
    • 1...Qg2
      • 2.Se6#
    • 1...Qh2
      • 2.Se6#
    • 1...Qxf4+
      • 2.Rxf4#
    • 1...Sf3
      • 2.Sg2#
      • 2.Sfh3#
      • 2.Sxd5#
      • 2.Sh5#
      • 2.Se6#
      • 2.Sxg6#
    • 1...Sf7
      • 2.Se6#
  • Tries
    • 1.Sf3+?
      • 1...Sxf3
        • 2.Sg2#
        • 2.Sh3#
        • 2.Sxd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sxg6#
      • 1...Qxf3!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Se6#
      • 1...Qxe1
        • 2.Sxd5#
      • 1...Qxe2
        • 2.Sgxe2#
      • 1...Qxf4
        • 2.Sf3#
      • 1...Sxf4
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_PINS(F),XS(B)::R(G)+S(F),DCHECK
    • Q(a);N_PINS(F)::R(G)+S(F),DCHECK
    • Q(a);N_PINS(F),XP(C)::S(B),XQ(a)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(F)::R(G),XQ(a)
    • S(f);N_PINS(F)::R(G)+S(F),DCHECK
  • Tries
    • Try
      • S(B);CHECK,N_SPINS(F)
      • Refutation
        • Q(a);P_PINS(F),XS(B)
  • Actual
    • Q(H);N_PINS(e),N_SPINS(F),P_PINS(f)
    • Threat
      • R(G)+S(F),DCHECK
    • Vars
      • Q(a);N_GUARD,XB(A)::R(G)+S(F),XS(e)
      • Q(a);XP(C)::S(B),XQ(a)
      • Q(a);N_GUARD,P_PINQ(H),P_SPINQ(a),XS(F)::S(B)
      • S(e);N_SPINS(f),OGATEB,P_SPINS(e),XS(F)::QAR2(H)
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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).