MESON Chess Problem Database

Problem Display
PID: 57592 (2n5/8/8/N2k4/4N1K1/8/7Q/1B6 w - - 0 1)

Kowalewski, Edmund

Chess Life, 1957

2n5/8/8/N2k4/4N1K1/8/7Q/1B6

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sa7
      • 2.Qd6#
    • 1...Se7
      • 2.Qd6#
  • Tries
    • 1.Kf5?
      • threat
        • 2.Qe5#
        • 2.Qd2#
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Kd4
        • 2.Qd2#
      • 1...Se7+!
    • 1.Qa2+?
      • 1...Ke5
        • 2.Sc6#
      • 1...Kd4!
    • 1.Qh5+?
      • 1...Kd4
        • 2.Qc5#
      • 1...Ke6!
  • Keys
    • 1.Qc7!
      • 1...Kd4
        • 2.Qc5#
      • 1...Ke6
        • 2.Ba2#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sb6
        • 2.Qd6#
      • 1...Sa7
        • 2.Qd6#
      • 1...Se7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(B),XS(b)
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::S(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAB1(B)
      • K(a);S_FLIGHT::B(A)
      • S(b);N_GUARD::QAR1(B),XS(b)
      • S(b);N_GUARD::QAR1(B)
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