MESON Chess Problem Database

Problem Display
PID: 17219 (8/8/2K5/2N1k2n/8/8/5QN1/8 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

8/8/2K5/2N1k2n/8/8/5QN1/8

#2

4 + 2

6315 Mes problemes et etudes d'echecs (Lazard) 1929
3295 Einfuhrung in die Welt des Schachproblem 1984

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sf6
      • 2.Qf4#
    • 1...Sg7
      • 2.Qf4#
  • Tries
    • 1.Se3?
      • threat
        • 2.Sc4#
        • 2.Sg4#
      • 1...Sf4
        • 2.Qb2#
      • 1...Sf6
        • 2.Sc4#
      • 1...Kd4!
    • 1.Qh4?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sf6
        • 2.Qf4#
      • 1...Sg7
        • 2.Qf4#
      • 1...Kf5!
    • 1.Qf1?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sf6
        • 2.Qf4#
      • 1...Sg7
        • 2.Qf4#
      • 1...Kd4!
    • 1.Qf3?
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sf6
        • 2.Qf4#
      • 1...Sg7
        • 2.Qf4#
      • 1...Kd4!
  • Keys
    • 1.Sh4!
      • threat
        • 2.Sg6#
      • 1...Sf4
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(b);N_GUARD::QAB1(A)
    • S(b);N_GUARD::QAB1(A),XS(b)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);SBLOCK::QAB(A)
        • S(b);::S(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • S(b);N_GUARD::QAB1(A),XS(b)
        • S(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Vars
        • S(b);N_GUARD::QAB1(A),XS(b)
        • S(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • S(b);N_GUARD::QAB1(A),XS(b)
        • S(b);N_GUARD::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • S(b);SBLOCK::QAB(A)
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