MESON Chess Problem Database

Problem Display
PID: 180688 (6r1/p3p3/5pp1/1Q1bkp2/1n3N1P/1pPnpP2/3P2P1/1K4B1 w - - 0 1)

Howard, David M

Problem Observer, 2012

6r1/p3p3/5pp1/1Q1bkp2/1n3N1P/1pPnpP2/3P2P1/1K4B1

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf4
      • 2.Bh2#
    • 1...Rg7
      • 2.Qb8#
    • 1...Rb8
      • 2.Qxb8#
  • Tries
    • 1.Qxd5+?
      • 1...Kxf4
        • 2.Bh2#
      • 1...Sxd5!
    • 1.Qb6?
      • threat
        • 2.Qc7#
      • 1...Kxf4
        • 2.Bh2#
      • 1...Bxf3
        • 2.Qd4#
      • 1...Sxf4
        • 2.d4#
      • 1...Rc8
        • 2.Sxg6#
      • 1...Rd8
        • 2.Sxg6#
      • 1...Sa6
        • 2.Sxd3#
      • 1...axb6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qc7#
      • 1...Kxf4
        • 2.Bh2#
      • 1...Bxf3
        • 2.Qd4#
      • 1...Sxf4
        • 2.d4#
      • 1...Rc8
        • 2.Sxg6#
      • 1...Rd8
        • 2.Sxg6#
      • 1...Sa6
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • K(f);N_SPINB(e),OGATEB,S_FLIGHT,XS(G)::B(B)
    • R(l);N_GUARD::QAB(I)
    • R(l);N_GUARD::QAB(I),XR(l)
  • Tries
    • Try
      • Q(I);CHECK,XB(e)
      • Vars
        • K(f);S_FLIGHT,XS(G)::B(B)
      • Refutation
        • S(d);XQ(I)
    • Try
      • Q(I);N_PINB(e)
      • Threat
        • QAB(I)
      • Vars
        • K(f);OGATEB,S_FLIGHT,XS(G)::B(B)
        • B(e);XP(F)::QAB1(I)
        • S(b);OGATE,SBLOCK,XS(G)::P(C)
        • R(l);N_GUARD::S(G),XP(i)
        • S(d);N_GUARD::S(G),XS(b)
      • Refutation
        • P(j);XQ(I)
  • Actual
    • Q(I);N_PINB(e)
    • Threat
      • QAB(I)
    • Vars
      • K(f);OGATEB,S_FLIGHT,XS(G)::B(B)
      • B(e);OGATE,XP(F)::QAB1(I)
      • S(b);OGATE,SBLOCK,XS(G)::P(C)
      • R(l);N_GUARD::S(G),XP(i)
      • S(d);N_GUARD::S(G),XS(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).