MESON Chess Problem Database

Problem Display
PID: 186654 (1b3Qb1/p1PnPp2/K2p4/1PpkpB2/R1n1p3/4P3/8/8 w - - 0 1)

Petkov, Petko Andonov

Chess, 1960

1b3Qb1/p1PnPp2/K2p4/1PpkpB2/R1n1p3/4P3/8/8

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc7
      • 2.Qa8#
    • 1...Bh7
      • 2.Qxf7#
    • 1...f6
      • 2.Qxg8#
  • Tries
    • 1.c8Q?
      • threat
        • 2.Qb7#
        • 2.Qc6#
      • 1...Bc7
        • 2.Qb7#
        • 2.Qa8#
      • 1...Sa5!
    • 1.e8Q?
      • 1...Bxc7
        • 2.Qa8#
      • 1...Sxe3
        • 2.Bxe4#
      • 1...Sxf8
        • 2.Qc6#
      • 1...Sa5
        • 2.Bxe4#
      • 1...Bh7
        • 2.Qexf7#
        • 2.Qfxf7#
      • 1...Sb2
        • 2.Bxe4#
      • 1...Sa3
        • 2.Bxe4#
      • 1...Scb6
        • 2.Bxe4#
      • 1...Sdb6
        • 2.Qc6#
      • 1...Sf6
        • 2.Qc6#
      • 1...f6
        • 2.Qxg8#
      • 1...Sd2!
  • Keys
    • 1.e8S!
      • 1...Bxc7
        • 2.Sxc7#
      • 1...Sxe3
        • 2.Qxd6#
      • 1...Sxf8
        • 2.Sf6#
      • 1...Sa5
        • 2.Qxd6#
      • 1...Bh7
        • 2.Qxf7#
      • 1...Sb2
        • 2.Qxd6#
      • 1...Sd2
        • 2.Qxd6#
      • 1...Sa3
        • 2.Qxd6#
      • 1...Scb6
        • 2.Qxd6#
      • 1...Sdb6
        • 2.Sf6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...f6
        • 2.Qxg8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • B(j);OGATE,XP(F)::QAB(H)
    • B(k);N_GUARD::QAB(H),XP(i)
    • P(i);OGATEB::QAB(H),XB(k)
  • Tries
    • Try
      • P(F);
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);
    • Try
      • P(G);
      • Vars
        • B(j);OGATE,XP(F)::QAB(G)
        • S(a);XP(A)::B(D),XP(b)
        • S(h);OGATE,XQ(H)::QAB1(G)
        • S(a);::B(D),XP(b)
        • S(h);OGATE::QAB1(G)
        • P(i);OGATEB::QAB(H),XB(k)
      • Refutation
        • S(a);
  • Actual
    • P(G);
    • Vars
      • B(j);XP(F)::S(G),XB(j)
      • S(a);N_GUARD,XP(A)::QAR1(H),XP(f)
      • S(h);N_GUARD,XQ(H)::S(G)
      • S(a);N_GUARD::QAR1(H),XP(f)
      • B(k);N_GUARD::QAB(H),XP(i)
      • S(h);N_GUARD::S(G)
      • S(h);N_GUARD::S(G),XS(h)
      • P(i);OGATEB::QAB(H),XB(k)
HTML5 logo

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).