MESON Chess Problem Database

Problem Display
PID: 276522 (8/6p1/6P1/5P2/p3B2N/K2Np3/3pk2n/7Q w - - 0 1)

Ahlheim, Karl-Heinz

Stella Polaris, 1970

8/6p1/6P1/5P2/p3B2N/K2Np3/3pk2n/7Q

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sg4
      • 2.Qf3#
    • 1...d1Q
      • 2.Qg2#
    • 1...d1S
      • 2.Qe1#
    • 1...d1B
      • 2.Qg2#
      • 2.Qe1#
    • 1...d1R
      • 2.Qg2#
  • Tries
    • 1.Ka2?
      • 1...Sf1
        • 2.Qf3#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Qg2#
        • 2.Qe1#
      • 1...d1R
        • 2.Qg2#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qf3#
      • 1...a3!
    • 1.Kb4?
      • 1...Sf1
        • 2.Qf3#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Qg2#
        • 2.Qe1#
      • 1...d1R
        • 2.Qg2#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qf3#
      • 1...a3!
    • 1.Sf3?
      • threat
        • 2.Sd4#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Qg2#
        • 2.Qe1#
      • 1...d1R
        • 2.Qg2#
      • 1...Sf1!
    • 1.Qxh2+?
      • 1...Kf1
        • 2.Qg2#
      • 1...Kd1!
    • 1.f6?
      • 1...Sf1
        • 2.Qf3#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Qg2#
        • 2.Qe1#
      • 1...d1R
        • 2.Qg2#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sg4
        • 2.Qf3#
      • 1...gxf6!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Sf4#
      • 1...Sf1
        • 2.Qg4#
      • 1...d1Q
        • 2.Qg2#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Qe1#
        • 2.Qg2#
      • 1...d1R
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD::QAB1(A)
    • S(c);N_GUARD::QAB1(A),XS(c)
    • P(a);SBLOCK::QAR2(A)
    • P(a);N_GUARD::QAR1(A)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(c);N_GUARD::QAB1(A)
        • P(a);SBLOCK::QAR2(A)
        • P(a);N_GUARD::QAR1(A)
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • P(e);
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(c);N_GUARD::QAB1(A)
        • P(a);SBLOCK::QAR2(A)
        • P(a);N_GUARD::QAR1(A)
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • P(e);
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • S(c);OGATE,XS(E)::QAB1(A),XS(c)
        • P(a);SBLOCK::QAR2(A)
        • P(a);N_GUARD::QAR1(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);CHECK,XS(c)
      • Vars
        • K(b);N_GUARD,S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • P(F);
      • Vars
        • S(c);N_GUARD::QAB1(A)
        • P(a);SBLOCK::QAR2(A)
        • P(a);N_GUARD::QAR1(A)
        • S(c);N_GUARD::QAB1(A),XS(c)
      • Refutation
        • P(f);XP(F)
  • Actual
    • Q(A);
    • Threat
      • S(C)
    • Vars
      • S(c);N_GUARD,SBLOCK::QAB(A)
      • P(a);SBLOCK::QAR2(A)
      • P(a);N_GUARD::QAR1(A)
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