MESON Chess Problem Database

Problem Display
PID: 197172 (1B1R4/8/B3p2n/3N4/p2pk1P1/K5p1/2P1q1P1/3n3Q w - - 0 1)

Haring, WH

Haagsche Post, 1917

1B1R4/8/B3p2n/3N4/p2pk1P1/K5p1/2P1q1P1/3n3Q

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3+
      • 2.Bxd3#
      • 2.cxd3#
    • 1...Qf3+
      • 2.gxf3#
    • 1...Qxg4
      • 2.Bd3#
    • 1...Qe1
      • 2.Bd3#
    • 1...Qf2
      • 2.Bd3#
    • 1...Qxg2
      • 2.Qxg2#
    • 1...Se3
      • 2.Sf6#
    • 1...Sxg4
      • 2.Qh7#
    • 1...Sf7
      • 2.Qh7#
    • 1...Sg8
      • 2.Qh7#
    • 1...exd5
      • 2.Re8#
  • Tries
    • 1.Bxe2?
      • threat
        • 2.Bd3#
        • 2.Bf3#
      • 1...Sxg4
        • 2.Bd3#
        • 2.Qh7#
      • 1...exd5
        • 2.Re8#
      • 1...Sb2
        • 2.Bf3#
      • 1...Sf2
        • 2.Bf3#
      • 1...d3!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Bd3#
      • 1...exd5
        • 2.Re8#
      • 1...d3
        • 2.Qb4#
      • 1...Sb2
        • 2.Qxe2#
      • 1...Sf2
        • 2.Qxe2#
      • 1...Se3
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(b);CHECK,OGATE::P(C),XQ(b)
    • Q(b);N_GUARD,XP(E)::B(G)
    • Q(b);N_GUARD::B(G)
    • Q(b);OGATE,P_SPINQ(b),XP(C)::QAB(A),XQ(b)
    • S(a);SBLOCK::S(F)
    • S(h);OGATE,XP(E)::QAB(A)
    • S(h);OGATE::QAB(A)
    • P(g);OGATEB,SBLOCK,XS(F)::R(I)
  • Tries
    • Try
      • B(G);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(g);OGATEB,SBLOCK,XS(F)::R(I)
        • S(a);::B(G)
      • Refutation
        • P(e);
  • Actual
    • Q(A);P_PINQ(b)
    • Threat
      • B(G)
    • Vars
      • P(g);OGATEB,SBLOCK,XS(F)::R(I)
      • P(e);OGATEB::QAR(A)
      • S(a);N_GUARD::QAR2(A),XQ(b)
      • S(a);N_SPINQ(b),SBLOCK::S(F)
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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).