MESON Chess Problem Database

Problem Display
PID: 54705 (7k/4N3/5K2/5nN1/2p3b1/8/5Q2/1B6 w - - 0 1)

Barnes, Barry Peter

The Problemist, 2003

7k/4N3/5K2/5nN1/2p3b1/8/5Q2/1B6

#2

5 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Sf7#
    • 1...Sg3
      • 2.Sf7#
    • 1...Sd4
      • 2.Sf7#
    • 1...Sh4
      • 2.Sf7#
    • 1...Sg7
      • 2.Sf7#
  • Tries
    • 1.Qh4+?
      • 1...Sxh4
        • 2.Sf7#
      • 1...Sh6
        • 2.Sf7#
        • 2.Qxh6#
      • 1...Bh5!
    • 1.Qh2+?
      • 1...Bh3
        • 2.Qb8#
      • 1...Sh4
        • 2.Sf7#
      • 1...Sh6
        • 2.Sf7#
        • 2.Qxh6#
      • 1...Bh5!
    • 1.Qxf5?
      • threat
        • 2.Sf7#
        • 2.Qh7#
      • 1...Bh5
        • 2.Qh7#
      • 1...Bxf5!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qd8#
      • 1...Sxd4
        • 2.Sf7#
      • 1...Sxe7
        • 2.Kf7#
      • 1...Bh5
        • 2.Kxf5#
      • 1...Sd6
        • 2.Kg6#
      • 1...Sh6
        • 2.Kg6#
      • 1...Sg7
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(c);::S(C)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(c);XQ(B)::S(C)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);P_SPINB(b)::QAR(B)
        • S(c);P_SPINS(c)::S(C)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);XS(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAR1(B)
      • Refutation
        • B(b);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • S(c);XQ(B)::S(C)
      • S(c);N_GUARD,XS(E)::QAB(B)+K(D)
      • B(b);::QAB(B)+K(D),XS(c)
      • S(c);N_GUARD::QAB(B)+K(D)
      • S(c);::S(C)
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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).