MESON Chess Problem Database

Problem Display
PID: 49875 (1N2RB2/7q/3pPP1b/2pkP2R/2n2P2/1Q1pPp1B/5K2/8 w - - 0 1)

Petkov, Petko Andonov

2nd Prize, Problemas, 1971

1N2RB2/7q/3pPP1b/2pkP2R/2n2P2/1Q1pPp1B/5K2/8

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qxc4#
    • 1...Qe4
      • 2.Qb7#
    • 1...Qf5
      • 2.Qb7#
    • 1...Qg6
      • 2.Qb7#
    • 1...Qg8
      • 2.Qxd3#
      • 2.Qb7#
    • 1...Qa7
      • 2.Qxd3#
    • 1...Qb7
      • 2.Qxd3#
      • 2.Qxb7#
    • 1...Qc7
      • 2.Qxd3#
    • 1...Qd7
      • 2.Qxd3#
    • 1...Qe7
      • 2.Qxd3#
    • 1...Qf7
      • 2.Qxd3#
    • 1...Qg7
      • 2.Qxd3#
    • 1...Qh8
      • 2.Qxd3#
      • 2.Qb7#
    • 1...Bg7
      • 2.Qb7#
    • 1...dxe5
      • 2.Rxe5#
  • Tries
    • 1.Bf5?
      • threat
        • 2.Qxd3#
      • 1...Qxf5
        • 2.Qb7#
      • 1...d2
        • 2.Qd3#
      • 1...Bxf4!
    • 1.Be7?
      • threat
        • 2.Qb7#
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qxe7
        • 2.Qxd3#
      • 1...Qf5!
    • 1.Bg7?
      • threat
        • 2.Qb7#
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qxg7
        • 2.Qxd3#
      • 1...dxe5!
    • 1.Rf5?
      • threat
        • 2.Qxd3#
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qxf5
        • 2.Qb7#
      • 1...d2
        • 2.Qd3#
      • 1...Qe7!
    • 1.Re7?
      • threat
        • 2.Qb7#
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qxe7
        • 2.Qxd3#
      • 1...dxe5!
    • 1.exd6+?
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qf5
        • 2.Qxd3#
        • 2.Qb7#
      • 1...Bg5!
  • Keys
    • 1.f7!
      • threat
        • 2.Qb7#
      • 1...Ke4
        • 2.Qxc4#
      • 1...Qxf7
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 10
  • Sets
    • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
    • Q(h);N_GUARD,SBLOCK::QAB(B)
    • Q(h);N_GUARD::QAB(B)
    • Q(h);N_GUARD::QAR2(B),XP(a)
    • B(g);S_CUTQ(h)::QAB(B)
    • P(f);OGATE,P_SPINP(f),XP(F)::R1(G),XP(f)
  • Tries
    • Try
      • B(D);
      • Threat
        • QAR2(B),XP(a)
      • Vars
        • Q(h);N_GUARD,XB(D)::QAB(B)
        • P(a);::QAR2(B)
      • Refutation
        • B(g);XP(E)
    • Try
      • B(L);
      • Threat
        • QAB(B)
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
        • Q(h);N_GUARD,XB(L)::QAR2(B),XP(a)
      • Refutation
        • Q(h);
    • Try
      • B(L);
      • Threat
        • QAB(B)
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
        • Q(h);N_GUARD,XB(L)::QAR2(B),XP(a)
      • Refutation
        • P(f);P_SPINP(f),XP(F)
    • Try
      • R(G);
      • Threat
        • QAR2(B),XP(a)
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
        • Q(h);N_GUARD,XR(G)::QAB(B)
        • P(a);::QAR2(B)
      • Refutation
        • Q(h);
    • Try
      • R(K);
      • Threat
        • QAB(B)
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
        • Q(h);N_GUARD,XR(K)::QAR2(B),XP(a)
      • Refutation
        • P(f);P_SPINP(f),XP(F)
    • Try
      • P(F);CHECK,XP(f)
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
      • Refutation
        • B(g);P_SPINB(g)
  • Actual
    • P(I);
    • Threat
      • QAB(B)
    • Vars
      • K(e);N_SPINS(c),S_FLIGHT::QAR2(B),XS(c)
      • Q(h);N_GUARD,XP(I)::QAR2(B),XP(a)
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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).