MESON Chess Problem Database

Problem Display
PID: 2301 (8/5B2/2p1p1r1/1nPk2PR/1P6/3K4/7p/Q4n2 w - - 0 1)

Derrickson, George H

Source?, 0000

8/5B2/2p1p1r1/1nPk2PR/1P6/3K4/7p/Q4n2

#2

7 + 7

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg5
      • 2.Rxg5#
    • 1...Rf6
      • 2.gxf6#
    • 1...Rh6
      • 2.gxh6#
    • 1...Rg7
      • 2.g6#
    • 1...Rg8
      • 2.g6#
    • 1...Sa3
      • 2.Qd4#
    • 1...Sd4
      • 2.Qxd4#
    • 1...Sd6
      • 2.Qd4#
    • 1...Sa7
      • 2.Qd4#
    • 1...Sc7
      • 2.Qd4#
  • Keys
    • 1.Qf6!
      • threat
        • 2.Bxe6#
        • 2.Qf5#
      • 1...Rxg5
        • 2.Bxe6#
        • 2.Rxg5#
        • 2.Qxg5#
        • 2.Qxe6#
      • 1...Rxf6
        • 2.gxf6#
      • 1...Se3
        • 2.Bxe6#
      • 1...Sg3
        • 2.Bxe6#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sd6
        • 2.Bxe6#
        • 2.Qd4#
      • 1...Sc7
        • 2.Qd4#
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(g);OGATE,P_SPINR(g),XP(E)::R(F),XR(g)
    • R(g);OGATE::R(F)+P(E),XR(g)
    • R(g);OGATE::R(F)+P(E)
    • S(c);N_GUARD::QAR1(A)
    • S(c);N_GUARD::QAR1(A),XS(c)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • R(g);OGATE,XQ(A)::R(F)+P(E),XR(g)
      • S(a);::B(G),XP(f)
      • S(c);N_GUARD::QAR1(A),XS(c)
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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).