MESON Chess Problem Database

Problem Display
PID: 2502 (8/8/2K3Q1/8/2bk4/2Np4/1B2q3/8 w - - 0 1)

Loyd, Sam

Frank Leslie's Illustrated Newspaper, 1858

8/8/2K3Q1/8/2bk4/2Np4/1B2q3/8

#2

4 + 4

1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Sxe2#
    • 1...Qd1
      • 2.Sxd1#
      • 2.Sd5#
      • 2.Qe4#
    • 1...Qf1
      • 2.Sd1#
      • 2.Sd5#
      • 2.Qe4#
    • 1...Qf3+
      • 2.Sd5#
    • 1...Qg4
      • 2.Sd1#
      • 2.Sd5#
    • 1...Qh5
      • 2.Sd1#
      • 2.Sd5#
      • 2.Qe4#
    • 1...Qc2
      • 2.Qe4#
    • 1...Qd2
      • 2.Qe4#
    • 1...Qf2
      • 2.Qe4#
    • 1...Qh2
      • 2.Qe4#
    • 1...Qe3
      • 2.Sb1#
      • 2.Sd1#
      • 2.Sa2#
      • 2.Se2#
      • 2.Sa4#
      • 2.Se4#
      • 2.Sb5#
      • 2.Sd5#
    • 1...Qe4+
      • 2.Sd5#
      • 2.Qxe4#
    • 1...Qe5
      • 2.Sd1#
      • 2.Sd5#
    • 1...Qe7
      • 2.Sd1#
      • 2.Sd5#
    • 1...d2
      • 2.Sd1#
      • 2.Sd5#
  • Keys
    • 1.Qe4+!
      • 1...Qxe4+
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • K(d);S_FLIGHT::B(A)+S(B),XQ(a)
    • Q(a);CHECK,N_GUARD::B(A)+S(B)
    • Q(a);N_GUARD::QAR1(D)
  • Actual
    • Q(D);CHECK
    • Vars
      • Q(a);CHECK,SBLOCK,XQ(D)::B(A)+S(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).