MESON Chess Problem Database

Problem Display
PID: 150660 (8/8/8/kp6/N7/8/B1K2B2/Q7 w - - 0 1)

Ahlheim, Karl-Heinz

Deutsche Schachzeitung, 1984

8/8/8/kp6/N7/8/B1K2B2/Q7

#2

5 + 2

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Tries
    • 1.Sb2?
      • 1...Ka6
        • 2.Bd5#
      • 1...b4
        • 2.Bc4#
      • 1...Kb4!
    • 1.Sc3?
      • 1...Ka6
        • 2.Bd5#
      • 1...b4
        • 2.Bb1#
        • 2.Bb3#
        • 2.Bc4#
        • 2.Bd5#
        • 2.Be6#
        • 2.Bf7#
        • 2.Bg8#
      • 1...Kb4!
    • 1.Bb3?
      • 1...Kb4
        • 2.Be1#
      • 1...bxa4
        • 2.Qxa4#
      • 1...b4
        • 2.Sc3#
      • 1...Ka6!
    • 1.Bd5?
      • 1...Kb4
        • 2.Be1#
      • 1...Ka6
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sb6#
      • 1...b4
        • 2.Sc3#
      • 1...bxa4!
    • 1.Qd4?
      • 1...Ka6
        • 2.Qb6#
        • 2.Qa7#
      • 1...bxa4
        • 2.Qb6#
      • 1...b4!
  • Keys
    • 1.Sb6!
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka6
        • 2.Bd5#
      • 1...b4
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Vars
        • K(a);P-FLIGHT::QAR(A)+B(B)
        • P(b);SBLOCK::QAR(A)+B(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(E);
      • Vars
        • K(a);P-FLIGHT::QAR(A)+B(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(B);
      • Vars
        • K(a);S_FLIGHT::B(D)
        • P(b);OGATE,P_SPINP(b),XS(E)::QAR1(A),XP(b)
        • P(b);SBLOCK::QAR(A)+S(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • B(B);
      • Vars
        • K(a);S_FLIGHT::B(D)
        • P(b);SBLOCK::QAR(A)+S(E)
      • Refutation
        • P(b);P_SPINP(b),XS(E)
    • Try
      • Q(A);
      • Vars
        • P(b);SBLOCK,XS(E)::QAB1(A)
      • Refutation
        • P(b);
  • Actual
    • S(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P-FLIGHT::QAR(A)+B(B)
      • P(b);SBLOCK::QAR(A)+B(B)
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