MESON Chess Problem Database

Problem Display
PID: 205567 (1nQ5/kP6/8/1K6/8/8/8/8 w - - 0 1)

Lazard, Frederic

La Strategie, 1925

1nQ5/kP6/8/1K6/8/8/8/8

#2

3 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sa6
      • 2.Qa8#
    • 1...Sc6
      • 2.Qa8#
    • 1...Sd7
      • 2.Qa8#
  • Tries
    • 1.Ka5?
      • 1...Sa6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Sc6+!
    • 1.Qd8?
      • threat
        • 2.Qb6#
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Kxb7!
    • 1.Qe8?
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Kxb7!
    • 1.Qf8?
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Kxb7!
    • 1.Qg8?
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Kxb7!
    • 1.Qh8?
      • 1...Sa6
        • 2.Qa8#
      • 1...Sc6
        • 2.Qa8#
      • 1...Sd7
        • 2.Qa8#
      • 1...Kxb7!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qb6#
      • 1...Sa6
        • 2.b8Q#
      • 1...Sc6
        • 2.b8Q#
        • 2.b8R#
      • 1...Sd7
        • 2.b8Q#
        • 2.b8R#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • S(b);OGATE::QAR1(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Vars
        • S(b);OGATE::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XP(B)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • S(b);OGATE::P=Q
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