MESON Chess Problem Database

Problem Display
PID: 60317 (8/3BrN2/2n1p1b1/4p3/4k3/1R2n3/1K2N3/2RQ4 w - - 0 1)

Loyd, Sam

The Circle, 1908

8/3BrN2/2n1p1b1/4p3/4k3/1R2n3/1K2N3/2RQ4

#2

7 + 7

5206 Sam Loyd and His Chess Problems 1913

SOLUTION

  • SOUND
  • Sets
    • 1...Bf5
      • 2.Sg5#
    • 1...Sf1
      • 2.Sd6#
      • 2.Qd3#
    • 1...Sc2
      • 2.Sd6#
      • 2.Qd3#
    • 1...Sg2
      • 2.Sd6#
      • 2.Qd3#
    • 1...Sg4
      • 2.Sd6#
      • 2.Qd3#
    • 1...Sd5
      • 2.Sd6#
      • 2.Qc2#
      • 2.Qd3#
    • 1...Sf5
      • 2.Sg5#
      • 2.Bxc6#
      • 2.Qh1#
      • 2.Qd3#
  • Tries
    • 1.Sc3+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Kf4!
    • 1.Bxc6+?
      • 1...Sd5
        • 2.Sd6#
        • 2.Qc2#
        • 2.Qd3#
      • 1...Kf5!
    • 1.Qh1+?
      • 1...Kf5
        • 2.Qf3#
      • 1...Sg2!
  • Keys
    • 1.Qd5+!
      • 1...Kxd5
        • 2.Bxc6#
      • 1...Kf5
        • 2.Qf3#
      • 1...Sxd5
        • 2.Sd6#
      • 1...exd5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(f);SBLOCK::S(G)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P_SPINP(e),S_FLIGHT::QAR2(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • B(F);CHECK,XS(d)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P_SPINP(e),S_FLIGHT::QAR2(B)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(B);CHECK
    • Vars
      • K(b);S_FLIGHT,XQ(B)::B(F),XS(d)
      • K(b);OGATE,P_SPINP(c),S_FLIGHT::QAR2(B)
      • S(a);SBLOCK,XQ(B)::S(G)
      • P(e);SBLOCK,XQ(B)::S(G)
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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).