MESON Chess Problem Database

Problem Display
PID: 17357 (1R6/Npb1B3/1rp3QK/p1q2Pp1/nkB3R1/pP2NP2/P2P4/3b4 w - - 0 1)

Oppenheimer, Otto

Enroque!!, 1946

1R6/Npb1B3/1rp3QK/p1q2Pp1/nkB3R1/pP2NP2/P2P4/3b4

#2

13 + 11

14773 The Best American Chess Problems of 1946 1948
459 Nebraska Chess Bulletin 1951

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Sxc2#
    • 1...Be2
      • 2.Sc2#
    • 1...Bxf3
      • 2.Sc2#
    • 1...Bd8
      • 2.Bf1#
      • 2.Be2#
      • 2.Bd3#
      • 2.Bb5#
      • 2.Bd5#
      • 2.Ba6#
      • 2.Be6#
      • 2.Bf7#
      • 2.Bg8#
  • Tries
    • 1.Sxc6+?
      • 1...Rxc6
        • 2.Sd5#
      • 1...bxc6!
  • Keys
    • 1.Qxc6!
      • threat
        • 2.Sd5#
      • 1...Qd6+
        • 2.Be6#
      • 1...Rxc6+
        • 2.Sxc6#
      • 1...Bxf3
        • 2.Sc2#
      • 1...bxc6
        • 2.Sxc6#
      • 1...Bd6
        • 2.Qxa4#
      • 1...Sc3
        • 2.Bxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(D),XB(a)
    • B(a);N_GUARD::S(D)
    • B(a);N_GUARD,XP(E)::S(D)
  • Tries
    • Try
      • S(K);CHECK,XP(i)
      • Vars
        • R(h);P_PINQ(I),P_SPINP(j),XS(K)::S(D)
      • Refutation
        • P(j);P_SPINR(h),XS(K)
  • Actual
    • Q(I);P_SPINQ(I),XP(i)
    • Threat
      • S(D)
    • Vars
      • Q(f);CHECK,N_PINQ(I),S_CUTB(k)::R(G)+B(F)
      • R(h);CHECK,P_SPINP(j),XQ(I)::S(K),XR(h)
      • B(a);N_GUARD,XP(E)::S(D)
      • P(j);P_SPINR(h),XQ(I)::S(K),XP(j)
      • B(k);N_PINQ(I),N_SPINQ(f)::QAR1(I),XS(c)
      • S(c);N_GUARD::B(L),XQ(f)
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