MESON Chess Problem Database

Problem Display
PID: 230825 (5Q2/8/4R3/3P4/2pkn3/8/2K3B1/8 w - - 0 1)

Hoffmann, Fritz

Stella Polaris, 1968

5Q2/8/4R3/3P4/2pkn3/8/2K3B1/8

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Rxe4#
    • 1...Kxd5
      • 2.Qd6#
    • 1...Sd2
      • 2.Qf2#
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sc3
      • 2.Qf2#
    • 1...Sg3
      • 2.Qf2#
    • 1...Sc5
      • 2.Qg7#
      • 2.Qf2#
      • 2.Qf6#
      • 2.Qh8#
    • 1...Sg5
      • 2.Qf2#
    • 1...Sd6
      • 2.Qf2#
  • Tries
    • 1.Qa3?
      • 1...Kxd5
        • 2.Qd6#
      • 1...Sd2
        • 2.Qe3#
        • 2.Qa7#
      • 1...Sf2
        • 2.Qe3#
        • 2.Qa7#
      • 1...Sc3
        • 2.Qa7#
      • 1...Sg3
        • 2.Qe3#
        • 2.Qa7#
      • 1...Sc5
        • 2.Qc3#
        • 2.Qe3#
      • 1...Sg5
        • 2.Qe3#
        • 2.Qa7#
      • 1...Sd6
        • 2.Qe3#
        • 2.Qa7#
      • 1...Sf6
        • 2.Qe3#
        • 2.Qa7#
      • 1...c3!
  • Keys
    • 1.Qb4!
      • 1...Ke3
        • 2.Qd2#
      • 1...Kxd5
        • 2.Qd6#
      • 1...Sd2
        • 2.Qb6#
      • 1...Sf2
        • 2.Qb6#
      • 1...Sc3
        • 2.Qb6#
      • 1...Sg3
        • 2.Qb6#
      • 1...Sc5
        • 2.Qc3#
      • 1...Sg5
        • 2.Qb6#
      • 1...Sd6
        • 2.Qb6#
      • 1...Sf6
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 7
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINS(c),S_FLIGHT::R1(D),XS(c)
    • K(b);OGATEB,P-FLIGHT,P_SPINS(c),XP(C)::QAR1(E)
    • S(c);N_GUARD::QAB(E)
    • S(c);N_GUARD::QAB(E),XS(c)
  • Tries
    • Try
      • Q(E);
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINS(c),XP(C)::QAR1(E)
        • S(c);N_GUARD::QAB(E)
      • Refutation
        • P(a);
  • Actual
    • Q(E);P_PINP(a)
    • Vars
      • K(b);N_SPINP(a),P_SPINS(c),S_FLIGHT::QAB1(E)
      • K(b);N_SPINP(a),OGATEB,P-FLIGHT,P_SPINS(c),XP(C)::QAR1(E)
      • S(c);N_GUARD::QAB(E)
      • S(c);N_GUARD,SBLOCK::QAB1(E)
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