MESON Chess Problem Database

Problem Display
PID: 6620 (1Nn5/N1n5/5Q2/k7/8/1K6/8/8 w - - 0 1)

Lebedev, Viacheslav Aleksandr

Il Problema, 1932

1Nn5/N1n5/5Q2/k7/8/1K6/8/8

#2

4 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
3296 Shakhmatny zadachi miniaturi 1987
3813 300 Sachmatu Uzdaviniu 1991
2838 Fun with Chess Miniatures 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Qa6#
    • 1...Sd5
      • 2.Qa6#
    • 1...Sa6
      • 2.Qxa6#
    • 1...Sa8
      • 2.Qa6#
    • 1...Se8
      • 2.Qa6#
    • 1...Sb6
      • 2.Qc3#
  • Tries
    • 1.Sxc8?
      • threat
        • 2.Qb6#
      • 1...Kb5
        • 2.Qb6#
      • 1...Sd5
        • 2.Qa6#
      • 1...Sa8
        • 2.Qe5#
        • 2.Qg5#
        • 2.Qf5#
        • 2.Qa6#
      • 1...Se6!
    • 1.Sd7?
      • threat
        • 2.Qa1#
      • 1...Sxa7
        • 2.Qb6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...Sb5!
    • 1.Qc6?
      • 1...Sb5
        • 2.Qxb5#
        • 2.Qa6#
      • 1...Sd5
        • 2.Qb5#
        • 2.Qc5#
        • 2.Qa6#
      • 1...Sa6
        • 2.Qb5#
        • 2.Qxa6#
      • 1...Se6
        • 2.Qb5#
        • 2.Qa6#
      • 1...Sa8
        • 2.Qb5#
        • 2.Qc5#
        • 2.Qa6#
      • 1...Se8
        • 2.Qb5#
        • 2.Qc5#
        • 2.Qa6#
      • 1...Sb6
        • 2.Qc3#
      • 1...Sd6
        • 2.Qxc7#
      • 1...Se7
        • 2.Qxc7#
      • 1...Sxa7!
    • 1.Qd6?
      • threat
        • 2.Qb4#
      • 1...Sb5
        • 2.Qa6#
      • 1...Sd5
        • 2.Qc5#
        • 2.Qa6#
      • 1...Sa6
        • 2.Qxa6#
      • 1...Sxd6!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qb4#
      • 1...Sb5
        • 2.Sac6#
      • 1...Sd5
        • 2.Qc5#
      • 1...Sa6
        • 2.Sbc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
    • S(c);SBLOCK::QAB(B)
  • Tries
    • Try
      • S(C);XS(c)
      • Threat
        • QAB1(B)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • S(b);
    • Try
      • S(D);
      • Threat
        • QAR(B)
      • Vars
        • S(c);N_GUARD,XS(C)::QAB1(B)
        • S(c);N_GUARD::QAB1(B),XS(c)
      • Refutation
        • S(b);
    • Try
      • Q(B);
      • Vars
        • S(c);SBLOCK::QAB(B)
        • S(c);N_GUARD::QAB(B),XS(b)
      • Refutation
        • S(c);XS(C)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);N_GUARD::QAR1(B)
        • S(b);N_GUARD::QAR1(B),XS(b)
      • Refutation
        • S(c);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • S(b);SBLOCK::S(C)
      • S(b);N_GUARD::QAR2(B)
      • S(b);SBLOCK::S(D)
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