MESON Chess Problem Database

Problem Display
PID: 65267 (3RR2K/2pb4/2p4p/pnN1P2r/N2k3r/p2Pp3/Bq2P2p/B3Q3 w - - 0 1)

Degener, Udo

3rd Prize, US Problem Bulletin, 1991

3RR2K/2pb4/2p4p/pnN1P2r/N2k3r/p2Pp3/Bq2P2p/B3Q3

#2

11 + 13

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Sa7
      • 2.Rxd7#
  • Tries
    • 1.Bxb2+?
      • 1...Sc3
        • 2.Bxc3#
        • 2.Rxd7#
        • 2.Qxc3#
      • 1...axb2!
    • 1.Qg3?
      • threat
        • 2.Se6#
      • 1...Rxe5
        • 2.Qxe5#
      • 1...Rf4
        • 2.Qxf4#
      • 1...Sd6!
    • 1.Qh1?
      • threat
        • 2.Sb3#
      • 1...Re4
        • 2.Qxe4#
      • 1...Sc3!
  • Keys
    • 1.Qxa5!
      • threat
        • 2.Qb4#
      • 1...Sc3
        • 2.Se6#
      • 1...Sd6
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(h);N_GUARD::R(I),XB(m)
  • Tries
    • Try
      • B(A);CHECK,XQ(a)
      • Refutation
        • P(c);XB(A)
    • Try
      • Q(B);
      • Threat
        • S(G)
      • Vars
        • R(i);OGATE,XP(H)::QAB1(B),XR(i)
        • R(f);N_GUARD::QAR2(B),XR(f)
      • Refutation
        • S(h);N_SPINB(m)
    • Try
      • Q(B);
      • Threat
        • S(G)
      • Vars
        • R(f);N_GUARD::QAR1(B),XR(f)
      • Refutation
        • S(h);N_SPINQ(a)
  • Actual
    • Q(B);XP(g)
    • Threat
      • QAR2(B)
    • Vars
      • S(h);N_SPINQ(a)::S(G)
      • S(h);N_SPINB(m)::S(G)
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