MESON Chess Problem Database

Problem Display
PID: 230400 (3R3b/3N4/2p5/1r1b1QK1/N1pkP3/3p4/5P2/3n3B w - - 0 1)

Petkov, Petko Andonov

Deutsche Schachzeitung, 1959

3R3b/3N4/2p5/1r1b1QK1/N1pkP3/3p4/5P2/3n3B

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qxe5#
    • 1...Bf6+
      • 2.Qxf6#
    • 1...Sxf2
      • 2.Qxf2#
    • 1...c5
      • 2.Qxd5#
  • Keys
    • 1.Qf4!
      • threat
        • 2.exd5#
      • 1...Bxe4+
        • 2.Sdc5#
      • 1...Be6+
        • 2.e5#
      • 1...Bf7+
        • 2.e5#
      • 1...Bg8+
        • 2.e5#
      • 1...Bf6+
        • 2.Qxf6#
      • 1...Sxf2
        • 2.Qxf2#
      • 1...d2
        • 2.Qxd2#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sc3
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::QAB1(E),XB(h)
    • B(h);CHECK,N_GUARD::QAB(E),XB(h)
    • S(a);OGATE,XP(B)::QAB(E),XS(a)
    • P(g);N_GUARD,S_CUTR(e)::QAR1(E),XB(f)
  • Actual
    • Q(E);
    • Threat
      • QAR(E)+P(D),XB(f)
    • Vars
      • B(f);CHECK,P_SPINB(f),XP(D)::R(H)+S(G)
      • B(f);CHECK,N_GUARD::QAR(E)+P(D)
      • B(h);CHECK,N_GUARD::QAB(E),XB(h)
      • S(a);OGATE,XP(B)::QAB(E),XS(a)
      • P(b);OGATEB::QAR2(E),XP(b)
      • B(h);N_GUARD::QAB1(E),XB(h)
      • S(a);N_GUARD::QAB1(E)
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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).