MESON Chess Problem Database

Problem Display
PID: 139524 (1q6/2pR2B1/2P1k3/4N3/p2n3n/1r1Q3K/B7/6b1 w - - 0 1)

Ellerman, Arnoldo

Eskilstuna Kuriren, 1918

1q6/2pR2B1/2P1k3/4N3/p2n3n/1r1Q3K/B7/6b1

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qg6#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Sg5#
        • 2.Qe4#
      • 1...Sdxf3
        • 2.Qd5#
      • 1...Sxc6
        • 2.Sg5#
        • 2.Qd5#
      • 1...Shxf3
        • 2.Qg6#
      • 1...Qd8
        • 2.Qe4#
      • 1...Bh2
        • 2.Sxd4#
        • 2.Sg5#
      • 1...Be3
        • 2.Qe4#
      • 1...Sg6
        • 2.Sg5#
        • 2.Qxg6#
      • 1...Qb5!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sg5#
      • 1...Qb5
        • 2.Sd8#
      • 1...Qd8
        • 2.Sxd8#
      • 1...Be3
        • 2.Qe4#
      • 1...Sdf3
        • 2.Qd5#
      • 1...Shf3
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);N_PINQ(B)::QAR2(B)
  • Tries
    • Try
      • S(D);N_SPINQ(B)
      • Threat
        • DUALS(2)
      • Vars
        • S(d);OGATE,XS(D)::QAB1(B)
        • S(e);N_GUARD,XS(D)::QAR2(B)
        • Q(h);::QAR2(B)
        • B(a);::QAR2(B)
      • Refutation
        • Q(h);
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • Q(h);N_GUARD::S(D)
      • Q(h);N_GUARD::S(D),XQ(h)
      • B(a);N_PINQ(B)::QAR2(B)
      • S(d);N_PINQ(B)::QAB1(B)
      • S(e);N_PINQ(B)::QAR2(B)
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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).