MESON Chess Problem Database

Problem Display
PID: 138646 (3R4/n7/KPk4p/2p1p3/2p1p1R1/4b3/N2P1prB/1bQ2NrB w - - 0 1)

Hall, N

London Opinion, 1904

3R4/n7/KPk4p/2p1p3/2p1p1R1/4b3/N2P1prB/1bQ2NrB

#2

10 + 12

119 Tidskrift for Schack 1909
3530 Het Half Pin Thema (II) 1947

SOLUTION

  • SOUND
  • Tries
    • 1.Qxc4?
      • threat
        • 2.Sb4#
        • 2.Qd5#
        • 2.Qe6#
      • 1...Bxd2
        • 2.Qd5#
        • 2.Qe6#
      • 1...Bd3
        • 2.Sb4#
      • 1...Sb5
        • 2.Sb4#
        • 2.Qxb5#
        • 2.Qd5#
      • 1...Sc8
        • 2.Sb4#
        • 2.Qb5#
        • 2.Qd5#
        • 2.Qa4#
      • 1...Bxa2!
  • Keys
    • 1.d4!
      • threat
        • 2.d5#
      • 1...Bxd4
        • 2.Qxh6#
      • 1...cxd4
        • 2.Qxc4#
      • 1...exd4
        • 2.Rd6#
      • 1...cxd4 ep
        • 2.Sb4#
      • 1...exd4 ep
        • 2.Rg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);P_PINP(h),XP(f)
      • Threat
        • DUALS(3)
      • Vars
        • B(a);P_PINQ(A)::S(D)
      • Refutation
        • B(a);XS(D)
  • Actual
    • P(E);
    • Threat
      • P(E)
    • Vars
      • B(e);OGATE,XP(E)::QAR(A),XP(k)
      • P(h);OGATEB,P_SPINP(f),XP(E)::QAR2(A),XP(f)
      • P(i);XP(E)::R1(J)
      • P(f);EP,P_SPINP(h),XP(E)::S(D)
      • P(g);EP,P_SPINR(d),XP(E)::R(G)
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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).