MESON Chess Problem Database

Problem Display
PID: 196865 (1NkN4/1R2P3/3p4/2q2b2/1pR5/4p3/8/K7 w - - 0 1)

Fontana, Alessandro

Schweizerische Schachzeitung, 1919

1NkN4/1R2P3/3p4/2q2b2/1pR5/4p3/8/K7

#2

6 + 6

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qc6
      • 2.Rxc6#
    • 1...Qc7
      • 2.Rcxc7#
    • 1...d5
      • 2.Rxc5#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Sxd6#
      • 1...d5
        • 2.Sd6#
      • 1...Kxb7!
  • Keys
    • 1.Sbc6!
      • threat
        • 2.Sa7#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Qa7+
        • 2.Sxa7#
      • 1...Qa5+
        • 2.Sxa5#
      • 1...Qe5+
        • 2.Sxe5#
      • 1...Qxc6
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::R(B),XQ(c)
    • Q(c);OGATE::R1(B),XQ(c)
    • P(e);N_GUARD::R(B),XQ(c)
  • Tries
    • Try
      • S(F);
      • Threat
        • S(F),XP(e)
      • Vars
        • P(e);::S(F)
      • Refutation
        • K(f);N_SPINQ(c),S_FLIGHT,XR(C)
  • Actual
    • S(E);N_PINQ(c)
    • Threat
      • S(E)
    • Vars
      • Q(c);CHECK::R(B)+S(E),XQ(c)
      • Q(c);CHECK::R(B)+S(E),DCHECK,XQ(c)
      • Q(c);OGATE,P_SPINQ(c),XS(E)::R(B),XQ(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).