MESON Chess Problem Database

Problem Display
PID: 96621 (Bb3r2/1N2n3/2q5/1pr2R1N/4k2P/2P4P/4Kn1Q/8 w - - 0 1)

Oppenheimer, Otto

The Chess Problem, 1947

Bb3r2/1N2n3/2q5/1pr2R1N/4k2P/2P4P/4Kn1Q/8

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd7
      • 2.Sd6#
    • 1...Qe8
      • 2.Sd6#
    • 1...Qa6
      • 2.Sd6#
    • 1...Qb6
      • 2.Sd6#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qe6
      • 2.Sd6#
    • 1...Qf6
      • 2.Sd6#
    • 1...Qg6
      • 2.Sd6#
    • 1...Qh6
      • 2.Sd6#
    • 1...Qc7
      • 2.Sd6#
    • 1...Qc8
      • 2.Sd6#
    • 1...Bg3
      • 2.Sxg3#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Bd6
      • 2.Sxd6#
    • 1...Ba7
      • 2.Sg3#
      • 2.Sd6#
      • 2.Qf4#
  • Keys
    • 1.Qd6!
      • threat
        • 2.Sg3#
      • 1...Kxf5
        • 2.Sg3#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Rxc3
        • 2.Re5#
      • 1...Bxd6
        • 2.Sxd6#
      • 1...Sxf5
        • 2.Sxc5#
      • 1...Rg8
        • 2.Rf4#
      • 1...Sh1
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 12
  • Sets
    • Q(e);::B(I)+S(H),DCHECK
    • Q(e);::B(I)+S(H),DCHECK,XQ(e)
    • B(g);N_GUARD::S(G),XB(g)
    • B(g);N_GUARD::QAR1(B),XB(g)
    • B(g);N_GUARD::S(H),XB(g)
  • Actual
    • Q(B);
    • Threat
      • S(G)
    • Vars
      • K(b);S_FLIGHT,XR(F)::S(G)
      • Q(e);XQ(B)::B(I)+S(H),DCHECK,XQ(e)
      • R(d);N_GUARD,XP(C)::R1(F)
      • B(g);XQ(B)::S(H),XB(g)
      • S(f);SBLOCK,XR(F)::S(H),XR(d)
      • R(h);N_GUARD::R1(F)
      • S(a);N_GUARD::QAB1(B)
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