MESON Chess Problem Database

Problem Display
PID: 240629 (2Q5/Rq1P3K/3Nk1p1/1r5p/8/2B1N3/8/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1980

2Q5/Rq1P3K/3Nk1p1/1r5p/8/2B1N3/8/8

#2

7 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke7
      • 2.d8Q#
    • 1...Qh1
      • 2.d8Q#
      • 2.d8R#
    • 1...Qg2
      • 2.d8Q#
      • 2.d8R#
    • 1...Qf3
      • 2.d8Q#
      • 2.d8R#
    • 1...Qe4
      • 2.d8Q#
      • 2.d8R#
    • 1...Qd5
      • 2.d8Q#
      • 2.d8R#
    • 1...Qb6
      • 2.d8Q#
      • 2.d8R#
    • 1...Qxd7+
      • 2.Qxd7#
  • Tries
    • 1.Sdc4?
      • threat
        • 2.Qe8#
      • 1...Qxd7+
        • 2.Qxd7#
      • 1...Ke7
        • 2.Qe8#
      • 1...Kf7
        • 2.Qe8#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Qa8
        • 2.d8S#
      • 1...Qb8
        • 2.d8S#
      • 1...Re5!
    • 1.Sxb5?
      • threat
        • 2.Qe8#
      • 1...Qxd7+
        • 2.Qxd7#
      • 1...Ke7
        • 2.Qe8#
      • 1...Kf7
        • 2.Qe8#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Qa8
        • 2.d8S#
      • 1...Qb8
        • 2.d8S#
      • 1...Qxb5!
    • 1.Sf7?
      • threat
        • 2.Qe8#
      • 1...Ke7
        • 2.Qe8#
      • 1...Kxf7
        • 2.Qe8#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Qxd7
        • 2.Qxd7#
      • 1...Qa8
        • 2.d8S#
      • 1...Qb8
        • 2.d8S#
      • 1...Re5!
  • Keys
    • 1.Se4!
      • threat
        • 2.Qe8#
      • 1...Qxd7+
        • 2.Qxd7#
      • 1...Ke7
        • 2.Qe8#
      • 1...Kf7
        • 2.Qe8#
      • 1...Qxe4
        • 2.d8Q#
        • 2.d8R#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Qa8
        • 2.d8S#
      • 1...Qb8
        • 2.d8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);N_PINP(E),P-FLIGHT::P=Q
    • Q(e);N_PINP(E)::P=Q
    • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::QAB1(G),XQ(e)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR2(G)
      • Vars
        • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::QAB1(G),XQ(e)
        • K(c);N_PINP(E),P-FLIGHT::QAR1(G)
        • K(c);N_PINP(E),S_FLIGHT::QAB1(G)
        • Q(e);N_PINP(E),XQ(G)::PXQ(e)=Q
        • Q(e);N_PINP(E)::P=S
      • Refutation
        • R(a);
    • Try
      • S(C);XR(a)
      • Threat
        • QAR2(G)
      • Vars
        • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::QAB1(G),XQ(e)
        • K(c);N_PINP(E),P-FLIGHT::QAR1(G)
        • K(c);N_PINP(E),S_FLIGHT::QAB1(G)
        • Q(e);N_PINP(E),XQ(G)::PXQ(e)=Q
        • Q(e);N_PINP(E)::P=S
      • Refutation
        • Q(e);N_PINP(E),XS(C)
    • Try
      • S(C);N_SPINP(E)
      • Threat
        • QAR2(G)
      • Vars
        • K(c);P-FLIGHT::QAR1(G)
        • K(c);S_FLIGHT,XS(C)::QAB1(G)
        • Q(e);OGATE,XQ(G)::PXQ(e)=Q
        • Q(e);OGATE,P_PINS(C),P_SPINQ(e),XP(E)::QAB1(G),XQ(e)
        • Q(e);N_GUARD::P=S
      • Refutation
        • R(a);
  • Actual
    • S(C);
    • Threat
      • QAR2(G)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XP(E)::QAB1(G),XQ(e)
      • K(c);N_PINP(E),P-FLIGHT::QAR1(G)
      • K(c);N_PINP(E),S_FLIGHT::QAB1(G)
      • Q(e);N_PINP(E),XS(C)::P=Q
      • Q(e);N_PINP(E),XQ(G)::PXQ(e)=Q
      • Q(e);N_PINP(E)::P=S
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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).