MESON Chess Problem Database

Problem Display
PID: 40375 (4q3/B2QR1p1/3np1bN/b1r1n3/2p1kN2/4PRP1/2K3B1/8 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1972

4q3/B2QR1p1/3np1bN/b1r1n3/2p1kN2/4PRP1/2K3B1/8

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Sb7
      • 2.Qd4#
    • 1...Sf7
      • 2.Qd4#
    • 1...Sc8
      • 2.Qd4#
  • Keys
    • 1.Sd5!
      • threat
        • 2.Rf4#
      • 1...Kxd5+
        • 2.Rf5#
      • 1...Sxf3
        • 2.Qxe6#
      • 1...Sxd7
        • 2.Rf5#
      • 1...exd5
        • 2.Qg4#
      • 1...Sd3
        • 2.Rf5#
      • 1...Sg4
        • 2.Rf5#
      • 1...Sc6
        • 2.Rf5#
      • 1...Sef7
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 3
  • Sets
    • S(f);OGATE::QAR1(I)
  • Actual
    • S(F);
    • Threat
      • B(B)+R(D),DCHECK
    • Vars
      • K(b);CHECK,P_SPINS(f),S_FLIGHT,XS(F)::B(B)+R(D)
      • S(e);OGATEB,P_SPINP(g),P_SPINS(e),XR(D)::QAR2(I),XP(g)
      • S(e);N_GUARD,P_SPINP(g),XQ(I)::B(B)+R(D)
      • P(g);OGATE,P_SPINS(e),SBLOCK,XS(F)::QAR2(I)
      • S(e);N_GUARD,P_SPINP(g)::B(B)+R(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).