MESON Chess Problem Database

Problem Display
PID: 221932 (2r4b/2R2P1K/n2P4/7Q/1n1k4/3P1BN1/1P1BP3/6q1 w - - 0 1)

Petkov, Petko Andonov

Stella Polaris, 1967

2r4b/2R2P1K/n2P4/7Q/1n1k4/3P1BN1/1P1BP3/6q1

#2

11 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Bc3#
    • 1...Ra8
      • 2.Rc4#
    • 1...Rb8
      • 2.Rc4#
    • 1...Rd8
      • 2.Rc4#
    • 1...Re8
      • 2.Rc4#
    • 1...Rf8
      • 2.Rc4#
    • 1...Rg8
      • 2.Rc4#
    • 1...Be5
      • 2.Sf5#
    • 1...Sa2
      • 2.Qd5#
    • 1...Sc2
      • 2.Qd5#
    • 1...Sxd3
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sc6
      • 2.Qd5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sb8
      • 2.Qc5#
  • Tries
    • 1.Qe5+?
      • 1...Bxe5
        • 2.Sf5#
      • 1...Kxe5!
  • Keys
    • 1.Re7!
      • threat
        • 2.Re4#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qe3
        • 2.Bxe3#
      • 1...Re8
        • 2.Bc3#
      • 1...Sc5
        • 2.Sf5#
        • 2.Bc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 11
  • Sets
    • Q(a);SBLOCK::B(B)
    • R(e);N_GUARD::R1(I)
    • B(f);SBLOCK::S(F)
    • S(b);N_GUARD::QAR1(G)
    • S(b);N_GUARD,XP(D)::QAR1(G)
    • S(b);N_GUARD::QAR1(G),XS(b)
    • S(d);N_GUARD::QAB1(G),XS(d)
    • S(d);N_GUARD::QAB1(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • B(f);SBLOCK,XQ(G)::S(F)
      • Refutation
        • K(c);S_FLIGHT,XQ(G)
  • Actual
    • R(I);
    • Threat
      • R1(I)
    • Vars
      • B(f);N_GUARD::QAB1(G),XB(f)
      • S(b);N_GUARD::QAR1(G),XS(b)
      • Q(a);N_GUARD::B(B),XQ(a)
      • R(e);N_GUARD::B(B)
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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).