MESON Chess Problem Database

Problem Display
PID: 85851 (8/8/8/kNQ5/8/8/8/N2K4 w - - 0 1)

Speckmann, Werner

Die Schwalbe, 1971

8/8/8/kNQ5/8/8/8/N2K4

#2

4 + 1

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Sc3#
  • Tries
    • 1.Kc1?
      • 1...Ka4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Ke1?
      • 1...Ka4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Kc2?
      • 1...Ka4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Kd2?
      • 1...Ka4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Ke2?
      • 1...Ka4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Sc2?
      • 1...Ka4
        • 2.Qb4#
      • 1...Ka6!
  • Keys
    • 1.Sb3+!
      • 1...Ka4
        • 2.Qc4#
      • 1...Ka6
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::S(C)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(B);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(A);
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(A);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR2(D)
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