MESON Chess Problem Database

Problem Display
PID: 2486 (8/4p1K1/4p3/4kN2/3R4/7Q/7b/5b1n w - - 0 1)

Loyd, Sam

Frank Leslie's Illustrated Newspaper, 1858

8/4p1K1/4p3/4kN2/3R4/7Q/7b/5b1n

#2

4 + 6

153 La Strategie 1867
1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913
1842 The White King 1914

SOLUTION

  • SOUND
  • Sets
    • 1...exf5
      • 2.Qe3#
  • Tries
    • 1.Kg6?
      • threat
        • 2.Qe3#
        • 2.Qh8#
      • 1...exf5
        • 2.Qe3#
      • 1...Bg2
        • 2.Qh8#
      • 1...Bd3
        • 2.Qh8#
      • 1...Bg1
        • 2.Qh8#
      • 1...Bg3
        • 2.Qh8#
      • 1...Bf4
        • 2.Qh8#
      • 1...Sf2
        • 2.Qxh2#
        • 2.Qh8#
      • 1...Sg3
        • 2.Qh8#
      • 1...Bxh3!
    • 1.Qxh2+?
      • 1...Kxf5
        • 2.Qf4#
        • 2.Qh5#
      • 1...Sg3!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Kg6#
      • 1...Kxf5
        • 2.Qh5#
      • 1...exf5
        • 2.Kf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(e);SBLOCK,XS(C)::QAR2(A)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(e);XS(C)::QAR2(A)
        • B(a);::QAB(A)
        • B(a);P_PINS(C)::QAB(A)
        • B(c);::QAB(A)
        • S(b);::QAB(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);CHECK,XB(c)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+K(D)
    • Vars
      • K(d);OGATEB,P-FLIGHT,XS(C)::QAR2(A)
      • P(e);SBLOCK,XS(C)::QAB(A)+K(D)
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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).