MESON Chess Problem Database

Problem Display
PID: 43365 (2Q5/1PN5/4n1pp/R3n3/4k1p1/3pBN2/1b1P4/5R1K w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2Q5/1PN5/4n1pp/R3n3/4k1p1/3pBN2/1b1P4/5R1K

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Sg5#
    • 1...Bc1
      • 2.Rxe5#
    • 1...Ba3
      • 2.Rxe5#
    • 1...Sd4
      • 2.Rxe5#
  • Tries
    • 1.Sg5+?
      • 1...Sxg5
        • 2.Rf4#
      • 1...hxg5!
  • Keys
    • 1.Se8!
      • threat
        • 2.Sd6#
      • 1...Kf5
        • 2.Sg5#
      • 1...Ba3
        • 2.Rxe5#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sf7
        • 2.Qc6#
      • 1...Sc5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(c);P_SPINS(e),S_FLIGHT::R(A)+S(E)
    • B(a);N_GUARD::R1(F),XS(e)
    • S(f);S_CUTB(a)::R1(F),XS(e)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(f);XS(E)::R1(A)
      • Refutation
        • P(h);XS(E)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • K(c);P_SPINS(e),S_FLIGHT::R(A)+S(E)
      • B(a);N_GUARD::R1(F),XS(e)
      • S(e);N_GUARD::QAB(I)
      • S(f);::S(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).