MESON Chess Problem Database

Problem Display
PID: 246580 (3Qn3/3p4/R2PrPBK/3PkP2/4p3/3nN3/4N3/b2R3b w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

5th HM., The Problemist, 1989

3Qn3/3p4/R2PrPBK/3PkP2/4p3/3nN3/4N3/b2R3b

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Qxe7#
    • 1...Sc1
      • 2.Sc4#
      • 2.Sg4#
    • 1...Se1
      • 2.Sc4#
      • 2.Sg4#
    • 1...Sb2
      • 2.Sg4#
    • 1...Sf2
      • 2.Sc4#
    • 1...Sb4
      • 2.Sc4#
      • 2.Sg4#
    • 1...Sf4
      • 2.Sc4#
      • 2.Sg4#
    • 1...Sc5
      • 2.Sc4#
      • 2.Sg4#
  • Tries
    • 1.Qa5?
      • threat
        • 2.Sg4#
      • 1...Kxf6
        • 2.Sg4#
      • 1...Sxf6
        • 2.Sc4#
      • 1...Sf2
        • 2.Qxa1#
      • 1...Bf3!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Sc4#
      • 1...Kxd6
        • 2.Sc4#
      • 1...Sxd6
        • 2.Sg4#
      • 1...Re7
        • 2.Qxe7#
      • 1...Sb2
        • 2.dxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(f);OGATEB::QAR2(K),XR(f)
    • S(c);::S(C)
  • Tries
    • Try
      • Q(K);
      • Threat
        • S(C)
      • Vars
        • K(e);S_FLIGHT,XP(H)::S(C)
        • S(h);SBLOCK,XP(H)::S(C)
        • S(c);N_GUARD::QAB(K),XB(a)
      • Refutation
        • B(b);
  • Actual
    • R(F);
    • Threat
      • S(C)
    • Vars
      • K(e);P_SPINP(g),S_FLIGHT,XP(G)::S(C)
      • S(h);SBLOCK,XP(G)::S(C)
      • R(f);OGATEB::QAR2(K),XR(f)
      • S(c);N_GUARD::R(F)+P(D),XR(f)
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