MESON Chess Problem Database

Problem Display
PID: 87155 (4Q3/8/4B2p/K5bp/5B1k/7N/6P1/7n w - - 0 1)

Kovalenko, Vitaly Semenovich

Magadanskaya Pravda, 1997

4Q3/8/4B2p/K5bp/5B1k/7N/6P1/7n

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be7
      • 2.Qxe7#
    • 1...Bd8+
      • 2.Qxd8#
    • 1...Sf2
      • 2.g3#
  • Tries
    • 1.Sg1?
      • threat
        • 2.Sf3#
      • 1...Bd8+
        • 2.Qxd8#
      • 1...Bxf4!
    • 1.Qf8?
      • 1...Bd8+
        • 2.Qxd8#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...Bf6
        • 2.Qxf6#
      • 1...Be7
        • 2.Qxe7#
      • 1...Sf2
        • 2.g3#
      • 1...Sg3!
  • Keys
    • 1.Qa4!
      • 1...Bd8+
        • 2.Bc7#
      • 1...Bxf4
        • 2.Qxf4#
      • 1...Bf6
        • 2.Be5#
      • 1...Be7
        • 2.Bd6#
      • 1...Sf2
        • 2.g3#
      • 1...Sg3
        • 2.Bxg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(c);OGATEB::QAB(F),XB(c)
    • B(c);CHECK,OGATEB::QAB(F),XB(c)
    • S(a);N_GUARD::P(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • B(c);CHECK,OGATEB::QAB(F),XB(c)
      • Refutation
        • B(c);XB(C)
    • Try
      • Q(F);
      • Vars
        • B(c);CHECK,OGATEB::QAB(F),XB(c)
        • B(c);OGATE,XB(C)::QAR2(F),XB(c)
        • B(c);OGATEB::QAB(F),XB(c)
        • S(a);N_GUARD::P(A)
      • Refutation
        • S(a);
  • Actual
    • Q(F);
    • Vars
      • B(c);CHECK,N_GUARD::QAR(F)+B(C)
      • B(c);OGATE,P_SPINB(c),XB(C)::QAR2(F),XB(c)
      • B(c);N_GUARD::QAR(F)+B(C)
      • S(a);N_GUARD::P(A)
      • S(a);SBLOCK::QAR(F)+B(C),DCHECK,XB(c)
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