MESON Chess Problem Database

Problem Display
PID: 74725 (3kB3/4N3/K2P1nQ1/3R4/7B/8/8/8 w - - 0 1)

Lider, Valentin Viktorovich

1st HM., Europe Echecs, 1979

3kB3/4N3/K2P1nQ1/3R4/7B/8/8/8

#2

7 + 2

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Tries
    • 1.Ba4?
      • 1...Sxd5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Se4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sg4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh7
        • 2.Qe8#
      • 1...Se8
        • 2.Qxe8#
      • 1...Sg8
        • 2.Qe8#
        • 2.Qxg8#
      • 1...Sd7!
    • 1.Bb5?
      • 1...Sxd5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Se4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sg4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh7
        • 2.Qe8#
      • 1...Se8
        • 2.Qxe8#
      • 1...Sg8
        • 2.Qe8#
        • 2.Qxg8#
      • 1...Sd7!
    • 1.Bc6?
      • 1...Sxd5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Se4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sg4
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh5
        • 2.Qe8#
        • 2.Qg8#
      • 1...Sh7
        • 2.Qe8#
      • 1...Se8
        • 2.Qxe8#
      • 1...Sg8
        • 2.Qe8#
        • 2.Qxg8#
      • 1...Sd7!
    • 1.Qf5?
      • threat
        • 2.Qc8#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Kxe8!
  • Keys
    • 1.d7!
      • 1...Kc7
        • 2.d8Q#
      • 1...Kxe7
        • 2.Qxf6#
      • 1...Sxd5
        • 2.Sxd5#
      • 1...Sxd7
        • 2.Rxd7#
      • 1...Sxe8
        • 2.dxe8S#
      • 1...Se4
        • 2.Qb6#
      • 1...Sg4
        • 2.Qb6#
      • 1...Sh5
        • 2.Qb6#
      • 1...Sh7
        • 2.Qb6#
      • 1...Sg8
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(G);
      • Vars
        • S(a);N_GUARD::QAR1(E)
        • S(a);N_GUARD::QAR1(E),XS(a)
      • Refutation
        • S(a);
    • Try
      • B(G);
      • Vars
        • S(a);N_GUARD::QAR1(E)
        • S(a);N_GUARD::QAR1(E),XS(a)
      • Refutation
        • S(a);
    • Try
      • B(G);
      • Vars
        • S(a);N_GUARD::QAR1(E)
        • S(a);N_GUARD::QAR1(E),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • S(a);N_GUARD::QAR1(E),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XB(G)
  • Actual
    • P(D);
    • Vars
      • K(b);OGATE,S_FLIGHT::P=Q
      • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XS(F)::QAB1(E),XS(a)
      • S(a);XR(B)::B(A)+S(F),XS(a)
      • S(a);OGATE,P_SPINS(a),XP(D)::R1(B),XS(a)
      • S(a);OGATE,XB(G)::PXS(a)=S
      • S(a);OGATE::QAB(E)
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