MESON Chess Problem Database

Problem Display
PID: 150804 (1Q6/p7/p2K1p2/P3Ppb1/4Pk2/6R1/7P/8 w - - 0 1)

Ahlheim, Karl-Heinz

Probleemblad, 1980

1Q6/p7/p2K1p2/P3Ppb1/4Pk2/6R1/7P/8

#2

7 + 6

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qb4#
  • Tries
    • 1.Kd5?
      • threat
        • 2.exf6#
        • 2.e6#
      • 1...fxe5
        • 2.Qxe5#
      • 1...fxe4!
    • 1.Qxa7?
      • threat
        • 2.Qe3#
      • 1...fxe4
        • 2.Qf2#
      • 1...Kxe4!
    • 1.Qb3?
      • threat
        • 2.Qe3#
        • 2.Qf3#
      • 1...Kxe4
        • 2.Qa4#
        • 2.Qc4#
        • 2.Qb4#
      • 1...fxe4!
    • 1.Qb6?
      • threat
        • 2.Qe3#
      • 1...Kxe4
        • 2.Qb4#
      • 1...fxe4
        • 2.Qf2#
      • 1...axb6!
    • 1.exf6?
      • threat
        • 2.Kd5#
      • 1...Kxe4
        • 2.Qb4#
      • 1...fxe4
        • 2.Ke6#
      • 1...Bxf6!
    • 1.e6?
      • threat
        • 2.Kd5#
      • 1...Kxe4
        • 2.Qb4#
      • 1...fxe4!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Qc4#
      • 1...fxe4
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,XP(C)::QAR(G)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • P(e);OGATE,P_SPINP(e),XP(E)::QAB1(G),XP(e)
      • Refutation
        • P(b);XP(C)
    • Try
      • Q(G);XP(f)
      • Threat
        • QAB1(G)
      • Vars
        • P(b);SBLOCK,XP(C)::QAR2(G)
      • Refutation
        • K(a);P-FLIGHT,XP(C)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);XP(C)
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(C)::QAR(G)
        • P(b);SBLOCK,XP(C)::QAR2(G)
      • Refutation
        • P(f);XQ(G)
    • Try
      • P(E);XP(e)
      • Threat
        • QAB(G)+K(F)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(C)::QAR(G)
        • P(b);SBLOCK,XP(C)::QAB(G)+K(F)
      • Refutation
        • B(c);XP(E)
    • Try
      • P(E);
      • Threat
        • QAB(G)+K(F)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(C)::QAR(G)
      • Refutation
        • P(b);XP(C)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G),XP(b)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(C)::QAR2(G)
      • P(b);OGATE,SBLOCK,XP(C)::QAR1(G)
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