MESON Chess Problem Database

Problem Display
PID: 267928 (4r2B/p2B4/q6p/p1pk4/2N1N3/1P2KP2/8/8 w - - 0 1)

Driver, John Edward

The Problemist, 1955

4r2B/p2B4/q6p/p1pk4/2N1N3/1P2KP2/8/8

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4+
      • 2.fxe4#
    • 1...Ra8
      • 2.Sc3#
    • 1...Rb8
      • 2.Sc3#
    • 1...Rc8
      • 2.Sc3#
    • 1...Rd8
      • 2.Sc3#
    • 1...Rf8
      • 2.Sc3#
    • 1...Rg8
      • 2.Sc3#
    • 1...Rxh8
      • 2.Sc3#
  • Keys
    • 1.Kd3!
      • threat
        • 2.Sc3#
      • 1...Qxc4+
        • 2.bxc4#
      • 1...Rxe4
        • 2.fxe4#
      • 1...Qf6
        • 2.Sxf6#
      • 1...Qg6
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(g);CHECK,OGATE,XS(E)::P(C),XR(g)
    • R(g);N_PINS(E)::S(E)
    • R(g);N_PINS(E),XB(G)::S(E)
  • Actual
    • K(B);N_SPINS(E),P-FLIGHT,P_SPINS(D)
    • Threat
      • S(E)
    • Vars
      • Q(d);CHECK,OGATE,XS(D)::P(A),XQ(d)
      • R(g);OGATE,XS(E)::P(C),XR(g)
      • Q(d);N_GUARD,N_PINS(D)::S(E),XQ(d)
      • Q(d);N_PINS(D),P_PINS(E)::S(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).