MESON Chess Problem Database

Problem Display
PID: 10891 (6BB/3P4/b5p1/1n1PNp1R/2p1k3/1P1p1pP1/5Pn1/r1Q2N1K w - - 0 1)

Petkov, Petko Andonov

3rd Prize, Problemas, 1969

6BB/3P4/b5p1/1n1PNp1R/2p1k3/1P1p1pP1/5Pn1/r1Q2N1K

#2

12 + 10

3751 FIDE Album (1968-1970) 1977
3840 Petkov Selected Compositions 2000
133 The Problemist Supplement 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qxc4#
    • 1...Se1
      • 2.Qe3#
      • 2.Qf4#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sf4
      • 2.Qe3#
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qe3#
      • 2.Qf4#
    • 1...Sd4
      • 2.Sd2#
  • Tries
    • 1.Sxc4?
      • threat
        • 2.Sfd2#
        • 2.Scd2#
      • 1...Rxc1
        • 2.Sd2#
      • 1...d2
        • 2.Qc2#
      • 1...Ra2!
    • 1.Sf7?
      • threat
        • 2.Sg5#
      • 1...Kxd5
        • 2.Qxc4#
      • 1...f4
        • 2.Sd2#
      • 1...g5
        • 2.Sxg5#
      • 1...d2!
    • 1.Rh4+?
      • 1...Sf4
        • 2.Rxf4#
        • 2.Qe3#
        • 2.Qxf4#
      • 1...Sxh4
        • 2.Qe3#
        • 2.Qf4#
      • 1...f4!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Sc5#
      • 1...Kxd3
        • 2.Qxc4#
      • 1...cxd3
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • K(f);P-FLIGHT::QAR1(A),XP(e)
    • S(b);N_GUARD::QAR1(A),XS(b)
    • S(g);SBLOCK::S(B)
  • Tries
    • Try
      • S(H);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);P_PINS(B),XQ(A)::S(H)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • R(a);
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • K(f);P_SPINP(h),S_FLIGHT,XP(G)::QAB1(A),XP(e)
        • P(h);::S(B)
        • P(j);::S(H),XP(j)
      • Refutation
        • P(c);
    • Try
      • R(I);CHECK
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • S(H);XP(c)
    • Threat
      • S(H)
    • Vars
      • K(f);S_FLIGHT,XS(H)::QAB1(A),XP(e)
      • P(e);SBLOCK,XS(H)::S(B)
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