MESON Chess Problem Database

Problem Display
PID: 143523 (3Nb2b/n1r1pp2/q6Q/2pkr2R/2R5/2P2p2/B2N3B/5Kn1 w - - 0 1)

Oppenheimer, Otto

American Chess Problemist, 1949

3Nb2b/n1r1pp2/q6Q/2pkr2R/2R5/2P2p2/B2N3B/5Kn1

#2

9 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4+
      • 2.Bxc4#
    • 1...Qb7
      • 2.Rd4#
    • 1...Qc8
      • 2.Rd4#
    • 1...Qa3
      • 2.Rd4#
    • 1...Qa4
      • 2.Rd4#
    • 1...Qa5
      • 2.Rd4#
    • 1...Qb6
      • 2.Rd4#
    • 1...Qc6
      • 2.Rd4#
    • 1...Qd6
      • 2.Rd4#
    • 1...Qe6
      • 2.Rd4#
    • 1...Qf6
      • 2.Rd4#
    • 1...Qg6
      • 2.Rd4#
    • 1...Qxh6
      • 2.Rd4#
    • 1...Se2
      • 2.Rd4#
    • 1...Sb5
      • 2.Rd4#
  • Tries
    • 1.Qe6+?
      • 1...Qxe6
        • 2.Rd4#
      • 1...fxe6!
  • Keys
    • 1.Qe3!
      • threat
        • 2.Qd3#
      • 1...Kd6
        • 2.Qd3#
      • 1...Rxh5
        • 2.Qe4#
      • 1...Qg6
        • 2.Rd4#
      • 1...Rf5
        • 2.Qe4#
      • 1...Rg5
        • 2.Qe4#
      • 1...Se2
        • 2.Rd4#
      • 1...Sb5
        • 2.Rd4#
      • 1...Sc6
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 12
  • Sets
    • Q(f);CHECK,OGATE,P_SPINQ(f),XR(F)::B(B),XQ(f)
    • Q(f);N_PINR(F)::B(B)+R(F),DCHECK
    • Q(f);N_PINR(F),XQ(H)::B(B)+R(F),DCHECK
    • S(a);N_PINR(F)::B(B)+R(F),DCHECK
    • S(g);N_PINR(F)::B(B)+R(F),DCHECK
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • Q(f);N_PINR(F),XQ(H)::B(B)+R(F),DCHECK
      • Refutation
        • P(j);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • K(d);P-FLIGHT::QAR(H)
      • R(e);N_SPINR(e),XR(G)::QAB1(H)
      • Q(f);N_PINR(F)::B(B)+R(F),DCHECK
      • R(e);::QAB1(H)
      • S(a);N_PINR(F)::B(B)+R(F),DCHECK
      • S(g);N_PINR(F)::B(B)+R(F),DCHECK
      • S(g);S_CUTR(h)::QAR1(H),XP(c)
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Developed and maintained by Brian Stephenson.
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