MESON Chess Problem Database

Problem Display
PID: 141233 (3R4/b7/2pn4/p2nN3/1P1kp2r/p4PB1/Q2P1P2/K2R4 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Deutsche Schachzeitung, 1987

3R4/b7/2pn4/p2nN3/1P1kp2r/p4PB1/Q2P1P2/K2R4

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Qc4#
    • 1...Se3
      • 2.fxe3#
    • 1...Sxb4
      • 2.Qc4#
    • 1...Sf6
      • 2.Qc4#
    • 1...Sc7
      • 2.Qc4#
    • 1...Se7
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sb5
      • 2.Qc4#
    • 1...Sf5
      • 2.Qc4#
    • 1...Sb7
      • 2.Qc4#
    • 1...Sf7
      • 2.Qc4#
    • 1...Sc8
      • 2.Qc4#
    • 1...Se8
      • 2.Qc4#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Sxc6#
      • 1...Sxb4
        • 2.Qc4#
      • 1...exf3
        • 2.Qd3#
      • 1...Sc3
        • 2.Qc4#
        • 2.dxc3#
      • 1...Se7
        • 2.Qc4#
      • 1...c5
        • 2.Sc6#
      • 1...axb4!
    • 1.Qb2+?
      • 1...Sc3
        • 2.Rxd6#
        • 2.dxc3#
      • 1...axb2+!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Sxc6#
      • 1...Sxb4
        • 2.Qc4#
      • 1...Sc3
        • 2.dxc3#
      • 1...Se3
        • 2.dxe3#
      • 1...Sf4
        • 2.Qxe4#
      • 1...Sb6
        • 2.Qc5#
      • 1...Sf6
        • 2.Qc4#
      • 1...Sc7
        • 2.Qc4#
      • 1...Se7
        • 2.Qc4#
      • 1...c5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • S(f);P_SPINS(h)::QAR1(C)
    • S(f);OGATE,P_SPINS(h)::P(E),XS(f)
    • S(f);P_SPINS(h),XP(H)::QAR1(C)
    • S(h);N_GUARD,P_SPINS(f)::QAR1(C),XS(h)
    • S(h);N_GUARD,P_SPINS(f)::QAR1(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • S(I),XP(g)
      • Vars
        • S(f);P_SPINS(h),XP(H)::QAR1(C)
        • P(c);N_GUARD,XP(F)::QAR1(C)
        • S(f);P_SPINS(h)::QAR1(C)
        • P(g);::S(I)
      • Refutation
        • P(e);XP(H)
    • Try
      • Q(C);CHECK
      • Refutation
        • P(a);CHECK,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • S(I),XP(g)
    • Vars
      • S(f);P_SPINS(h),XP(H)::QAR1(C)
      • S(f);OGATE,P_SPINS(h)::R(B)+P(D)DCHECK,XS(f)
      • S(f);P_SPINS(h),S_CUTR(d)::QAR1(C),XP(c)
      • S(f);P_SPINS(h),S_CUTB(i)::QAB1(C)
      • S(f);P_SPINS(h)::QAR1(C)
      • P(g);::S(I)
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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).