MESON Chess Problem Database

Problem Display
PID: 207005 (7Q/5n2/2N3b1/8/4kPp1/2P1B2N/2n1K3/4b3 w - - 0 1)

Derrickson, George H

New York Clipper, 1860

7Q/5n2/2N3b1/8/4kPp1/2P1B2N/2n1K3/4b3

#2

7 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se5
      • 2.Qxe5#
    • 1...Sg5
      • 2.Qe5#
    • 1...Sd6
      • 2.Qe5#
    • 1...Sh6
      • 2.Qe5#
    • 1...Sd8
      • 2.Qe5#
  • Tries
    • 1.Sg5+?
      • 1...Kf5
        • 2.Se7#
      • 1...Sxg5
        • 2.Qe5#
      • 1...Kd5!
  • Keys
    • 1.Se7!
      • threat
        • 2.Qa8#
      • 1...Sd4+
        • 2.Qxd4#
      • 1...Sxe3
        • 2.Qd4#
      • 1...Sxh8
        • 2.Sg5#
      • 1...Sb4
        • 2.Qd4#
      • 1...Se5
        • 2.Sg5#
        • 2.Qxe5#
      • 1...Sd6
        • 2.Sg5#
        • 2.Qe5#
      • 1...Sd8
        • 2.Sg5#
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(f);N_GUARD::QAR1(G),XS(f)
    • S(f);N_GUARD::QAR1(G)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);S_FLIGHT::S(F)
        • S(f);XS(D)::QAR1(G)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • S(F);
    • Threat
      • QAB(G)
    • Vars
      • S(b);CHECK,N_GUARD::QAR1(G),XS(b)
      • S(b);N_GUARD,XB(C)::QAR1(G)
      • S(f);N_GUARD,XQ(G)::S(D)
      • S(b);N_GUARD::QAR1(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).