MESON Chess Problem Database

Problem Display
PID: 579 (4R3/7P/2pprp2/1p2k3/1Nppp1P1/2R3K1/QB6/8 w - - 0 1)

Driver, John Edward

1st HM., The Observer, 1965

4R3/7P/2pprp2/1p2k3/1Nppp1P1/2R3K1/QB6/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Rxe7#
    • 1...dxc3
      • 2.Bxc3#
    • 1...d3
      • 2.Rxc4#
    • 1...e3
      • 2.Rxe3#
    • 1...f5
      • 2.h8Q#
      • 2.h8B#
  • Keys
    • 1.Qa8!
      • 1...Rxe8
        • 2.Qxe8#
      • 1...dxc3
        • 2.Bxc3#
      • 1...Re7
        • 2.Rxe7#
      • 1...d3
        • 2.Rxc4#
      • 1...e3
        • 2.Rxe3#
      • 1...d5
        • 2.Qb8#
      • 1...f5
        • 2.h8Q#
        • 2.h8B#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(h);OGATEB::R(H),XR(h)
    • P(b);OGATE,P_SPINP(b),XR(C)::B(B),XP(b)
    • P(b);OGATEB::B(B)+R(C),XP(a)
    • P(c);OGATEB::R(C),XP(c)
    • P(i);::P=Q
  • Actual
    • Q(A);
    • Vars
      • R(h);N_SPINR(h),OGATE,XR(H)::QAR(A),XR(h)
      • P(b);OGATE,P_SPINP(b),XR(C)::B(B),XP(b)
      • R(h);OGATEB::R(H),XR(h)
      • P(b);OGATEB::B(B)+R(C),XP(a)
      • P(c);OGATEB::R(C),XP(c)
      • P(g);OGATEB::QAB(A)
      • P(i);::P=Q
      • P(f);OGATE::QAR1(A)
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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).