MESON Chess Problem Database

Problem Display
PID: 184065 (r7/b7/3p1Q1P/5P1B/4pkNn/B1P3p1/1R4b1/K1N2n1r w - - 0 1)

Petite, Efren

Bulletin Ouvrier des Echecs, 1955

r7/b7/3p1Q1P/5P1B/4pkNn/B1P3p1/1R4b1/K1N2n1r

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Bxd6#
    • 1...Sf3
      • 2.Se2#
    • 1...Sg6
      • 2.fxg6#
  • Tries
    • 1.Qg5+?
      • 1...Kf3
        • 2.Sf2#
        • 2.Sh2#
        • 2.Se3#
        • 2.Se5#
        • 2.Sf6#
      • 1...Kxg5!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sd5#
      • 1...Kxe3
        • 2.Qg5#
      • 1...Bxe3
        • 2.Se2#
      • 1...Sxe3
        • 2.Bxd6#
      • 1...d5
        • 2.Sxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(c);SBLOCK::B(D),XP(h)
    • S(g);SBLOCK::S(B)
    • S(g);OGATE::QAR(I)+P(G),XS(g)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • K(f);S_FLIGHT,XQ(I)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • K(f);S_FLIGHT,XS(F)::QAB(I)
      • B(i);P_PINB(D),SBLOCK,XS(F)::S(B)
      • S(a);P_PINS(B),SBLOCK,XS(F)::B(D),XP(h)
      • P(h);::S(F),XP(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).