MESON Chess Problem Database

Problem Display
PID: 79853 (8/8/8/8/N7/5p1Q/pp6/1k1K4 w - - 0 1)

Auhagen, Ulrich Otto Ferdinand

Die Schwalbe, 1982

8/8/8/8/N7/5p1Q/pp6/1k1K4

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...a1Q
      • 2.Sc3#
    • 1...a1S
      • 2.Sc3#
    • 1...a1B
      • 2.Sc3#
    • 1...a1R
      • 2.Sc3#
  • Tries
    • 1.Kd2?
      • threat
        • 2.Qf1#
        • 2.Qh1#
      • 1...a1Q
        • 2.Sc3#
      • 1...a1S
        • 2.Sc3#
      • 1...a1B
        • 2.Sc3#
      • 1...a1R
        • 2.Sc3#
      • 1...f2
        • 2.Qf1#
      • 1...Ka1!
    • 1.Qf1?
      • threat
        • 2.Kd2#
      • 1...a1Q
        • 2.Sc3#
      • 1...a1S
        • 2.Sc3#
      • 1...a1B
        • 2.Sc3#
      • 1...a1R
        • 2.Sc3#
      • 1...Ka1!
    • 1.Qh2?
      • threat
        • 2.Qxb2#
      • 1...Ka1
        • 2.Qxb2#
      • 1...a1Q
        • 2.Sc3#
      • 1...a1B
        • 2.Sc3#
      • 1...f2!
    • 1.Qxf3?
      • 1...a1Q
        • 2.Sc3#
      • 1...a1S
        • 2.Sc3#
      • 1...a1B
        • 2.Sc3#
      • 1...a1R
        • 2.Sc3#
      • 1...Ka1!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qxb2#
      • 1...Ka1
        • 2.Qxb2#
      • 1...a1Q
        • 2.Sc3#
      • 1...a1B
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • P(b);SBLOCK::S(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(b);SBLOCK::S(C)
        • P(d);::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR(B)+K(A)
      • Vars
        • P(b);SBLOCK::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(c)
      • Vars
        • K(a);P-FLIGHT::QAB1(B),XP(c)
        • P(b);SBLOCK::S(C)
      • Refutation
        • P(d);
    • Try
      • Q(B);XP(d)
      • Vars
        • P(b);SBLOCK::S(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XP(c)
    • Vars
      • K(a);P-FLIGHT,P_SPINP(c)::QAB1(B),XP(c)
      • P(b);SBLOCK::S(C)
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