MESON Chess Problem Database

Problem Display
PID: 15238 (1nK4Q/1P2p3/rP4p1/r1k1P3/pR3n2/B4B2/3N4/q1b5 w - - 0 1)

Petkov, Petko Andonov

4th HM., Problemas, 1981

1nK4Q/1P2p3/rP4p1/r1k1P3/pR3n2/B4B2/3N4/q1b5

#2

9 + 10

3840 Petkov Selected Compositions 2000

SOLUTION

  • SOUND
  • Sets
    • 1...e6
      • 2.Qf8#
  • Tries
    • 1.Qe8?
      • threat
        • 2.Qxe7#
      • 1...Rxb6
        • 2.Rc4#
      • 1...Rb5
        • 2.Qxb5#
      • 1...Qd4
        • 2.Rb5#
      • 1...Sd5
        • 2.Se4#
      • 1...Sc6
        • 2.Qxc6#
      • 1...e6
        • 2.Qe7#
        • 2.Qf8#
      • 1...Qxe5!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qxe7#
      • 1...Qxe5
        • 2.Rb2#
      • 1...Rxb6
        • 2.Qxb6#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Rb5
        • 2.Rc4#
      • 1...Sc6
        • 2.Se4#
      • 1...e6
        • 2.Qe7#
        • 2.Qd6#
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • P(i);OGATEB::QAB(I)
  • Tries
    • Try
      • Q(I);
      • Threat
        • QAB(I),XP(i)
      • Vars
        • R(g);SBLOCK,XP(F)::B(B)+R(D),DCHECK
        • R(e);N_GUARD::QAR1(I),XR(e)
        • Q(a);SBLOCK::B(B)+R(D),DCHECK
        • S(d);SBLOCK::S(A)
        • S(j);N_GUARD::QAR1(I),XS(j)
      • Refutation
        • Q(a);XP(E)
  • Actual
    • Q(I);
    • Threat
      • QAB(I),XP(i)
    • Vars
      • Q(a);N_GUARD,XP(E)::B(B)+R(D)
      • R(g);OGATE,XP(F)::QAB1(I),XR(g)
      • S(d);N_GUARD::QAR1(I),XS(d)
      • Q(a);N_GUARD::QAB1(I),XQ(a)
      • R(e);SBLOCK::B(B)+R(D),DCHECK
      • S(j);SBLOCK::S(A)
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