MESON Chess Problem Database

Problem Display
PID: 49245 (K5nr/p4QPk/4P1n1/5N2/8/q1b5/8/1B6 w - - 0 1)

Forster, Klaus

1st Prize, Deutsche Schachblatter, 1987

K5nr/p4QPk/4P1n1/5N2/8/q1b5/8/1B6

#2

6 + 7

5159 FIDE Album (1986-1988) (Annexe) 1996

SOLUTION

  • SOUND
  • Sets
    • 1...Qf8+
      • 2.gxf8S#
    • 1...Bxg7
      • 2.Qxg7#
    • 1...Sf8
      • 2.gxf8S#
    • 1...Sf6+
      • 2.g8Q#
      • 2.g8S#
      • 2.g8B#
      • 2.g8R#
    • 1...Sh6+
      • 2.g8Q#
      • 2.g8B#
    • 1...Se7+
      • 2.g8Q#
      • 2.g8B#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qxg6#
      • 1...Sf6+
        • 2.g8S#
      • 1...Sh6+
        • 2.g8Q#
        • 2.g8B#
      • 1...Kh6
        • 2.Qxg6#
      • 1...Se7+!
    • 1.Se7?
      • threat
        • 2.Qxg6#
      • 1...Sf6+
        • 2.g8S#
      • 1...Sh6+
        • 2.g8Q#
        • 2.g8B#
      • 1...Kh6
        • 2.Qxg6#
      • 1...Sxe7+!
    • 1.gxh8S+?
      • 1...Bg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.gxh8B+?
      • 1...Bg7
        • 2.Qxg7#
      • 1...Kxh8!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qxg6#
      • 1...Qf8+
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...Sf6+
        • 2.g8S#
      • 1...Sh6+
        • 2.g8Q#
        • 2.g8B#
      • 1...Se7+
        • 2.g8S#
      • 1...Kh6
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);CHECK,OGATE::PXQ(a)=S
    • B(b);OGATE,P_SPINB(b),XP(E)::QAR1(D),XB(b)
    • S(c);OGATE::PXS(c)=S
    • S(f);CHECK,OGATE::P=Q
  • Tries
    • Try
      • S(B);P_PINS(c)
      • Threat
        • QAB1(D),XS(c)
      • Vars
        • S(f);CHECK,OGATE::P=S
        • S(f);CHECK,OGATE,SBLOCK::P=Q
        • K(e);N_SPINS(c),P-FLIGHT::QAR1(D),XS(c)
      • Refutation
        • S(f);CHECK
    • Try
      • S(B);P_PINS(c)
      • Threat
        • QAB1(D),XS(c)
      • Vars
        • S(f);CHECK,OGATE::P=S
        • S(f);CHECK,OGATE,SBLOCK::P=Q
        • K(e);N_SPINS(c),P-FLIGHT::QAR1(D),XS(c)
      • Refutation
        • S(f);CHECK,XS(B)
    • Try
      • P(E);CHECK,XR(g)
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(D),XB(b)
      • Refutation
        • K(e);P-FLIGHT,XS(E)
    • Try
      • P(E);CHECK,XR(g)
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(D),XB(b)
      • Refutation
        • K(e);P-FLIGHT,XB(E)
  • Actual
    • S(B);P_PINS(c)
    • Threat
      • QAB1(D),XS(c)
    • Vars
      • Q(a);CHECK,OGATE::PXQ(a)=Q
      • S(f);CHECK,OGATE::P=S
      • S(f);CHECK,OGATE,SBLOCK::P=Q
      • K(e);N_SPINS(c),P-FLIGHT::QAR1(D),XS(c)
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