MESON Chess Problem Database

Problem Display
PID: 203022 (4B3/3K3p/p3pkpp/3RNN2/rB2P3/b7/b7/5RQ1 w - - 0 1)

Haring, Jacobus

The Problemist, 1983

4B3/3K3p/p3pkpp/3RNN2/rB2P3/b7/b7/5RQ1

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Be7#
    • 1...Bb2
      • 2.Be7#
    • 1...g5
      • 2.Sg4#
  • Tries
    • 1.Sf7?
      • threat
        • 2.e5#
      • 1...exf5
        • 2.Qd4#
      • 1...e5
        • 2.Qb6#
      • 1...Bb2
        • 2.Be7#
      • 1...g5!
    • 1.Qg5+?
      • 1...hxg5
        • 2.Sg4#
      • 1...Kxg5!
  • Keys
    • 1.Sc4!
      • threat
        • 2.e5#
      • 1...exf5
        • 2.Bc3#
      • 1...Bb2
        • 2.Be7#
      • 1...e5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(b);N_GUARD::B(C)
    • P(g);SBLOCK::S(F)
  • Tries
    • Try
      • S(F);
      • Threat
        • P(D)
      • Vars
        • P(e);N_GUARD,P_SPINP(e),XS(G)::QAB(B)
        • P(e);OGATEB::QAR(B)
        • B(b);N_GUARD::B(C)
      • Refutation
        • P(g);
    • Try
      • Q(B);CHECK
      • Vars
        • P(h);SBLOCK,XQ(B)::S(F)
      • Refutation
        • K(f);S_FLIGHT,XQ(B)
  • Actual
    • S(F);
    • Threat
      • P(D)
    • Vars
      • P(e);N_GUARD,P_SPINP(e),XS(G)::B(C)
      • B(b);N_GUARD::B(C)
      • P(e);OGATEB::R(E)
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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).