MESON Chess Problem Database

Problem Display
PID: 11881 (q1r3b1/3Np1R1/4P1pp/bR1n2k1/6P1/r3N1P1/8/B1QB2nK w - - 0 1)

Petkov, Petko Andonov

4th Prize, BCF 134. Ty., 1973-1974

q1r3b1/3Np1R1/4P1pp/bR1n2k1/6P1/r3N1P1/8/B1QB2nK

#2

11 + 11

3840 Petkov Selected Compositions 2000

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Rxd5#
    • 1...Qa7
      • 2.Rxd5#
    • 1...Rxe3
      • 2.Qxe3#
    • 1...Rc6
      • 2.Rxd5#
  • Tries
    • 1.Sc2+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Bd2!
    • 1.Sc4+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Bd2!
    • 1.Sf8?
      • threat
        • 2.Rxg6#
      • 1...Bf7
        • 2.Sh7#
      • 1...Bh7
        • 2.Sxh7#
      • 1...Rxf8!
  • Keys
    • 1.Se5!
      • threat
        • 2.Rxg6#
      • 1...Sc3+
        • 2.Sd5#
      • 1...Sxe3+
        • 2.Sc6#
      • 1...Sb4+
        • 2.Sf3#
      • 1...Sf4+
        • 2.Sf3#
      • 1...Sb6+
        • 2.Sf3#
      • 1...Sf6+
        • 2.Sf3#
      • 1...Sc7+
        • 2.Sf3#
      • 1...Kf6
        • 2.Rxg6#
      • 1...Bf7
        • 2.Sxf7#
      • 1...Bh7
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 4
  • Sets
    • Q(i);N_GUARD::R(H),XS(d)
    • R(b);OGATE,P_SPINR(b),XS(E)::QAB(B),XR(b)
    • R(j);S_CUTQ(i)::R(H),XS(d)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB(B),XR(b)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(E);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB(B),XR(b)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(J);
      • Threat
        • R1(K),XP(f)
      • Vars
        • B(k);N_GUARD::S(J)
        • B(k);N_GUARD::S(J),XB(k)
      • Refutation
        • R(j);XS(J)
  • Actual
    • S(J);N_PINS(d)
    • Threat
      • R1(K),XP(f)
    • Vars
      • S(d);CHECK,S_CUTB(c),S_CUTR(b),S_CUTR(j)::QAB(B)+S(E)
      • S(d);CHECK,P_SPINS(d),XS(E)::R(H)+S(J)
      • S(d);CHECK::R(H)+S(J),DCHECK
      • K(e);N_SPINP(f),S_FLIGHT::R1(K),XP(f)
      • B(k);N_GUARD::S(J),XB(k)
      • B(k);N_GUARD::S(J)
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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).