MESON Chess Problem Database

Problem Display
PID: 103447 (8/2N1n1N1/8/8/4k3/8/Q7/2BK4 w - - 0 1)

Andruszkiewicz, S

Express Wieczorny, 1958

8/2N1n1N1/8/8/4k3/8/Q7/2BK4

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sf5
      • 2.Qd5#
    • 1...Sc6
      • 2.Qd5#
    • 1...Sg6
      • 2.Qd5#
    • 1...Sc8
      • 2.Qd5#
    • 1...Sg8
      • 2.Qd5#
  • Tries
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qf4#
      • 1...Kf3!
    • 1.Qd2?
      • threat
        • 2.Qe3#
      • 1...Ke5
        • 2.Qf4#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sf5
        • 2.Qd5#
      • 1...Kf3!
  • Keys
    • 1.Sf5!
      • 1...Kd3
        • 2.Qc2#
      • 1...Kf3
        • 2.Qe2#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kxf5
        • 2.Qe6#
      • 1...Sxf5
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sc6
        • 2.Qd5#
      • 1...Sg6
        • 2.Qd5#
      • 1...Sc8
        • 2.Qd5#
      • 1...Sg8
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAB1(C),XS(b)
    • S(b);N_GUARD::QAB1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • S(b);N_GUARD::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);S_FLIGHT,XS(E)::QAB1(C)
      • S(b);N_GUARD,XS(E)::QAB1(C)
      • S(b);N_GUARD::QAB1(C),XS(b)
      • S(b);N_GUARD::QAB1(C)
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