MESON Chess Problem Database

Problem Display
PID: 86590 (b7/3qR3/BbkBP1N1/P1ppQNK1/8/8/8/1r1n4 w - - 0 1)

Melnichenko, Viktor Oleksandrovich

1st Prize, Revista Romana de Sah, 1965

b7/3qR3/BbkBP1N1/P1ppQNK1/8/8/8/1r1n4

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Qxd6#
    • 1...Qxe7+
      • 2.Sfxe7#
      • 2.Sgxe7#
    • 1...d4
      • 2.Qe4#
  • Tries
    • 1.Qc3?
      • threat
        • 2.Se5#
      • 1...Qxe7+
        • 2.Sgxe7#
      • 1...Qxd6
        • 2.Sd4#
      • 1...Bxa5
        • 2.Qxc5#
      • 1...d4
        • 2.Qf3#
      • 1...Qxe6!
    • 1.Qh8?
      • threat
        • 2.Se5#
      • 1...Qxe7+
        • 2.Sgxe7#
      • 1...Qxe6
        • 2.Qxa8#
      • 1...Qxd6
        • 2.Qxa8#
      • 1...d4
        • 2.Qh1#
      • 1...Bxa5!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Se5#
      • 1...Qxe7+
        • 2.Sgxe7#
      • 1...Qxe6
        • 2.Bb5#
      • 1...Qxd6
        • 2.Bb5#
      • 1...d4
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);OGATE,XB(F)::QAR1(B),XQ(g)
    • P(d);OGATEB::QAB(B)
  • Tries
    • Try
      • Q(B);P_PINP(c)
      • Threat
        • S(H)
      • Vars
        • Q(g);CHECK,XR(I)::S(H),XQ(g)
        • Q(g);SBLOCK,XB(F)::S(C)
        • B(e);N_GUARD,XP(A)::QAR1(B),XP(c)
        • P(d);OGATEB::QAB(B)
      • Refutation
        • Q(g);XP(G)
    • Try
      • Q(B);
      • Threat
        • S(H)
      • Vars
        • Q(g);CHECK,XR(I)::S(H),XQ(g)
        • Q(g);N_GUARD,XP(G)::QAB(B),XB(h)
        • Q(g);N_GUARD,XB(F)::QAB(B),XB(h)
        • P(d);OGATEB::QAB(B)
      • Refutation
        • B(e);XP(A)
  • Actual
    • Q(B);
    • Threat
      • S(H)
    • Vars
      • Q(g);CHECK,XR(I)::S(H),XQ(g)
      • Q(g);XP(G)::B(E)
      • Q(g);XB(F)::B(E)
      • P(d);OGATEB::QAB(B)
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