MESON Chess Problem Database

Problem Display
PID: 139109 (NkB3R1/1P6/2p5/7n/N1p2q2/R1p3rb/K2n3B/6Q1 w - - 0 1)

Chicco, Adriano

Il Problema, 1932

NkB3R1/1P6/2p5/7n/N1p2q2/R1p3rb/K2n3B/6Q1

#2

9 + 9

3530 Het Half Pin Thema (II) 1947

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc8
      • 2.bxc8Q#
  • Tries
    • 1.Bg4+?
      • 1...Kxb7
        • 2.Sc5#
        • 2.Qb6#
      • 1...Qf8!
    • 1.Bf5+?
      • 1...Kxb7
        • 2.Sc5#
        • 2.Qb6#
      • 1...Rxg8!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sa6#
      • 1...Rxg1
        • 2.Bg4#
      • 1...Bxc8
        • 2.Rxc8#
        • 2.bxc8Q#
        • 2.bxc8R#
      • 1...Qe3
        • 2.Be6#
      • 1...Qf2
        • 2.Bf5#
      • 1...Qd4
        • 2.Bd7#
      • 1...Re3
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(d);OGATE,P_SPINB(d),XB(H)::PXB(d)=Q
  • Tries
    • Try
      • B(H);CHECK
      • Refutation
        • Q(f);P_SPINQ(f),P_SPINR(c)
    • Try
      • B(H);CHECK
      • Refutation
        • R(c);P_SPINQ(f),XR(I)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • R(c);P_SPINQ(f),XQ(A)::R(I)+B(H)
      • Q(f);N_GUARD,P_SPINR(c)::R(I)+B(H)
      • Q(f);P_SPINR(c)::R(I)+B(H)
      • R(c);N_GUARD,P_SPINQ(f)::R(I)+B(H)
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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).