MESON Chess Problem Database

Problem Display
PID: 2507 (7K/8/5Rqk/6bp/7R/8/3Q4/8 w - - 0 1)

Loyd, Sam

Source?, 0000

7K/8/5Rqk/6bp/7R/8/3Q4/8

#2

4 + 4

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qxe3#
    • 1...Bf4
      • 2.Qxf4#
  • Keys
    • 1.Rhf4!
      • 1...Qxf6+
        • 2.Rxf6#
      • 1...Bxf6+
        • 2.Rxf6#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...Bh4
        • 2.Rxh4#
      • 1...h4
        • 2.Rxh4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(a);OGATEB::QAB(A),XB(a)
  • Actual
    • R(B);N_PINB(a),N_PINP(b)
    • Vars
      • Q(c);CHECK,N_SPINQ(c),OGATE,XR(C)::R(B),XQ(c)
      • B(a);CHECK,N_SPINQ(c),OGATE,XR(C)::QAB(A)+R(B),XB(a)
      • B(a);OGATE,P_SPINB(a),XR(B)::QAB(A),XB(a)
      • B(a);OGATEB::QAB(A)+R(B),XB(a)
      • P(b);OGATEB::R(B),XP(b)
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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).