MESON Chess Problem Database

Problem Display
PID: 87708 (8/nNp1Rp2/Knk5/Qp6/2rq4/4B3/B1N5/3R4 w - - 0 1)

Oppenheimer, Otto

American Chess Problemist, 1949

8/nNp1Rp2/Knk5/Qp6/2rq4/4B3/B1N5/3R4

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Sb4#
    • 1...Qa1
      • 2.Sd8#
    • 1...Qb2
      • 2.Sd8#
    • 1...Qc3
      • 2.Sd8#
    • 1...Qc5
      • 2.Sd8#
    • 1...Qe5
      • 2.Sd8#
    • 1...Qf6
      • 2.Sd8#
    • 1...Qg7
      • 2.Sd8#
    • 1...Qe4
      • 2.Sd8#
    • 1...Qf4
      • 2.Sd8#
    • 1...Qg4
      • 2.Sd8#
    • 1...Qh4
      • 2.Sd8#
    • 1...Qd8
      • 2.Sxd8#
    • 1...Rc3
      • 2.Sxd4#
    • 1...Rc5
      • 2.Sxd4#
    • 1...Sc8
      • 2.Qxb5#
  • Keys
    • 1.Qc3!
      • threat
        • 2.Sb4#
      • 1...Kd5
        • 2.Sb4#
      • 1...Qxc3
        • 2.Sd8#
      • 1...Rxc3
        • 2.Sxd4#
      • 1...Qc5
        • 2.Sa5#
        • 2.Sd8#
      • 1...Qd6
        • 2.Sa5#
      • 1...Rc5
        • 2.Sxd4#
      • 1...Sd5
        • 2.Sxd4#
      • 1...b4
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • K(e);P_SPINP(c),P_SPINQ(b),P_SPINR(a),S_FLIGHT::S(C)
    • Q(b);N_GUARD::S(G)
    • Q(b);N_GUARD::S(G),XQ(b)
    • R(a);N_GUARD::S(C),XQ(b)
    • S(f);N_GUARD::QAB1(E),XP(c)
  • Actual
    • Q(E);P_PINR(a)
    • Threat
      • S(C)
    • Vars
      • K(e);P_SPINQ(b),S_FLIGHT::S(C)
      • Q(b);N_GUARD,N_SPINR(a),XQ(E)::S(G)
      • R(a);N_SPINR(a),XQ(E)::S(C),XQ(b)
      • Q(b);::S(G)
      • R(a);::S(C),XQ(b)
      • S(d);SBLOCK::S(C),XQ(b)
      • P(c);::S(C),XP(c)
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