MESON Chess Problem Database

Problem Display
PID: 51406 (2BB2NR/6n1/8/K5nr/6Pk/7P/7Q/8 w - - 0 1)

Petkov, Petko Andonov

The Guardian, 1959

2BB2NR/6n1/8/K5nr/6Pk/7P/7Q/8

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Rxh5#
    • 1...Se6
      • 2.Rxh5#
    • 1...Se8
      • 2.Rxh5#
  • Tries
    • 1.Sh6?
      • 1...Sf5
        • 2.Sxf5#
      • 1...Se6
        • 2.Sf5#
      • 1...Se8
        • 2.Sf5#
      • 1...Rxh6!
    • 1.Rh6?
      • 1...Sf5
        • 2.Rxh5#
      • 1...Se6
        • 2.Rxh5#
      • 1...Se8
        • 2.Rxh5#
      • 1...Rxh6!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sg6#
      • 1...Sf3+
        • 2.Sf5#
      • 1...Sxh3+
        • 2.Sd5#
      • 1...Se4+
        • 2.Sf5#
      • 1...S5e6+
        • 2.Sf5#
      • 1...Sf7+
        • 2.Sf5#
      • 1...Sh7+
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • S(d);N_GUARD::R1(H),XR(c)
  • Tries
    • Try
      • S(G);N_PINR(c)
      • Vars
        • S(d);N_GUARD::S(G),XS(d)
        • S(d);N_GUARD::S(G)
      • Refutation
        • R(c);P_SPINR(c),XS(G)
    • Try
      • R(H);
      • Vars
        • S(d);N_GUARD::R1(H),XR(c)
      • Refutation
        • R(c);N_SPINR(c),XR(H)
  • Actual
    • S(G);N_PINS(b)
    • Threat
      • S(G)
    • Vars
      • S(b);CHECK::B(F)+S(G),DCHECK
      • S(b);CHECK,P_SPINS(b),XP(B)::B(F)+S(G)
      • S(b);CHECK,N_SPINR(c)::B(F)+S(G),DCHECK
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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).