MESON Chess Problem Database

Problem Display
PID: 10585 (K7/4PP2/1B1NB2b/4k2N/2Q1n3/1n1q4/8/8 w - - 0 1)

Zappas, Byron

3rd Prize, De Waarheid, 1966

K7/4PP2/1B1NB2b/4k2N/2Q1n3/1n1q4/8/8

#2

8 + 5

3772 FIDE Album (1965-1967) 1976
273 Mat Plus 1994
56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Qd5#
    • 1...Qf1
      • 2.Qd5#
    • 1...Qc2
      • 2.Qd5#
    • 1...Qe2
      • 2.Qd5#
    • 1...Qc3
      • 2.Qd5#
    • 1...Qe3
      • 2.Qd5#
    • 1...Qf3
      • 2.Qd5#
    • 1...Qg3
      • 2.Qd5#
    • 1...Qh3
      • 2.Qd5#
    • 1...Qd5+
      • 2.Qxd5#
    • 1...Sd4
      • 2.Qd5#
  • Tries
    • 1.f8Q?
      • threat
        • 2.Sf7#
      • 1...Qd5+
        • 2.Qxd5#
      • 1...Kxd6
        • 2.Bc7#
      • 1...Qxd6
        • 2.Qf5#
      • 1...Sxd6
        • 2.Qf6#
      • 1...Qf1
        • 2.Qd5#
      • 1...Qf3
        • 2.Qd5#
      • 1...Sg5
        • 2.Qff4#
      • 1...Qxc4!
  • Keys
    • 1.f8S!
      • threat
        • 2.Sf7#
      • 1...Qd5+
        • 2.Qxd5#
      • 1...Kxd6
        • 2.Qc7#
      • 1...Qxd6
        • 2.Sg6#
      • 1...Sxd6
        • 2.Sd7#
      • 1...Qf1
        • 2.Qd5#
      • 1...Qf3
        • 2.Qd5#
      • 1...Sg5
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::QAR1(A)
    • Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
    • S(a);S_CUTQ(b)::QAR1(A)
  • Tries
    • Try
      • P(G);
      • Threat
        • S(D)
      • Vars
        • Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
        • K(d);OGATEB,S_FLIGHT,XS(D)::B(C)
        • Q(b);SBLOCK,XS(D)::QAR1(G)
        • S(c);N_GUARD,SBLOCK,XS(D)::QAB1(G)
        • Q(b);N_GUARD::QAR1(A)
        • S(c);S_CUTB(e)::QAB1(G)
      • Refutation
        • Q(b);XQ(A)
  • Actual
    • P(G);
    • Threat
      • S(D)
    • Vars
      • Q(b);CHECK,N_GUARD::QAR1(A),XQ(b)
      • K(d);OGATEB,S_FLIGHT,XS(D)::QAB1(A)
      • Q(b);SBLOCK,XS(D)::S(G)
      • S(c);SBLOCK,XS(D)::S(G)
      • Q(b);N_GUARD::QAR1(A)
      • S(c);OGATE::QAB1(A)
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