MESON Chess Problem Database

Problem Display
PID: 115208 (4QK2/p2p4/3p3p/5p1r/r2k4/1PNNpn2/1P2P3/8 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Canadian Chess Chat, 1982

4QK2/p2p4/3p3p/5p1r/r2k4/1PNNpn2/1P2P3/8

#2

7 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Qe4#
    • 1...d5
      • 2.Sb5#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Sb5#
        • 2.Qd5#
        • 2.Qxd6#
      • 1...Rb4
        • 2.Qd5#
        • 2.Qxd6#
      • 1...Ra5
        • 2.Qc4#
      • 1...Ra6
        • 2.Sb5#
        • 2.Qc4#
        • 2.Qd5#
      • 1...Se5
        • 2.Qd5#
        • 2.Qxd6#
      • 1...f4
        • 2.Qe4#
      • 1...d5
        • 2.Sb5#
        • 2.Qxd5#
      • 1...a6
        • 2.Qd5#
        • 2.Qxd6#
      • 1...dxe6!
    • 1.Qa8?
      • threat
        • 2.Sb5#
        • 2.Qd5#
      • 1...Rb4
        • 2.Qd5#
      • 1...f4
        • 2.Qe4#
      • 1...d5
        • 2.Qxd5#
      • 1...a6
        • 2.Qd5#
        • 2.Qa7#
      • 1...Ra5!
    • 1.Qb8?
      • threat
        • 2.Qxd6#
      • 1...Ra5
        • 2.Qb4#
      • 1...Ra6
        • 2.Qb4#
      • 1...d5
        • 2.Qf4#
      • 1...f4!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qd5#
      • 1...Ra5
        • 2.Qc4#
      • 1...f4
        • 2.Qxf4#
      • 1...d5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(e);N_GUARD::QAR1(F)
    • P(g);SBLOCK::S(D)
  • Tries
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • R(c);N_GUARD::QAR1(F)
        • P(e);N_GUARD::QAR1(F)
      • Refutation
        • P(j);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR1(F)
        • P(e);N_GUARD::QAR1(F)
        • P(g);::QAR1(F),XP(g)
      • Refutation
        • R(c);
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XP(g)
      • Vars
        • R(c);N_GUARD::QAR2(F)
        • P(g);OGATE::QAR2(F)
      • Refutation
        • P(e);
  • Actual
    • Q(F);
    • Threat
      • QAR1(F)
    • Vars
      • R(c);N_GUARD::QAR1(F)
      • P(e);OGATE::QAR2(F),XP(e)
      • P(g);::QAR1(F),XP(g)
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