MESON Chess Problem Database

Problem Display
PID: 98185 (1Q6/r1pNK3/4p2p/p5pr/2PNkPp1/5p2/2P2P1q/3R4 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Problemas, 1963

1Q6/r1pNK3/4p2p/p5pr/2PNkPp1/5p2/2P2P1q/3R4

#2

9 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qe5#
    • 1...c6
      • 2.Qe5#
  • Tries
    • 1.Re1+?
      • 1...Kxf4
        • 2.Qf8#
      • 1...Kxd4!
    • 1.Qxc7?
      • threat
        • 2.Sc5#
        • 2.Sf6#
        • 2.Qe5#
      • 1...Qxf4
        • 2.Sc5#
        • 2.Qc6#
      • 1...Qxf2
        • 2.Qe5#
      • 1...gxf4
        • 2.Sf6#
      • 1...e5
        • 2.Qxe5#
      • 1...Rxc7!
    • 1.Qb3?
      • threat
        • 2.Qe3#
      • 1...Kxf4
        • 2.Qe3#
      • 1...Qxf4
        • 2.Qd3#
      • 1...gxf4
        • 2.Qd3#
      • 1...Qxf2!
    • 1.Qb5?
      • threat
        • 2.Qe5#
      • 1...Kxf4
        • 2.Qe5#
      • 1...Qxf4
        • 2.Qc6#
      • 1...gxf4
        • 2.Sf6#
      • 1...e5
        • 2.Qxe5#
      • 1...c5!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qe5#
      • 1...Kxf4
        • 2.Qe5#
      • 1...Qxf4
        • 2.Sc5#
      • 1...gxf4
        • 2.Re1#
      • 1...e5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • P(k);OGATE,P_PINS(G)::QAR1(I)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINP(k),XP(F)::QAR(I)
      • Refutation
        • K(c);P-FLIGHT,XS(E)
    • Try
      • Q(I);XP(k)
      • Threat
        • DUALS(3)
      • Vars
        • Q(a);XP(C)::QAR1(I)
        • P(f);XP(F)::S(G)
        • P(h);::QAR1(I),XP(h)
      • Refutation
        • R(j);P_PINS(G),XQ(I)
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • K(c);P-FLIGHT,XP(F)::QAB1(I)
        • Q(a);SBLOCK,XP(F)::QAB1(I)
        • P(f);SBLOCK,XP(F)::QAB1(I)
      • Refutation
        • Q(a);XP(C)
    • Try
      • Q(I);
      • Threat
        • QAR1(I)
      • Vars
        • K(c);P-FLIGHT,XP(F)::QAB1(I)
        • Q(a);SBLOCK,XP(F)::QAB(I)
        • P(f);SBLOCK,XP(F)::S(G)
        • P(h);::QAR1(I),XP(h)
      • Refutation
        • P(k);P_PINS(G)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • K(c);P-FLIGHT,XP(F)::QAB1(I)
      • Q(a);SBLOCK,XP(F)::S(G)
      • P(f);SBLOCK,XP(F)::R(A)
      • P(h);::QAR1(I),XP(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).