MESON Chess Problem Database

Problem Display
PID: 15641 (Q7/3B4/8/r1pPN2b/R1N1kp2/5p2/1rPR1B2/4nK2 w - - 0 1)

Degener, Udo

1st HM., Schach-Aktiv, 1986

Q7/3B4/8/r1pPN2b/R1N1kp2/5p2/1rPR1B2/4nK2

#2

10 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.cxd3#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sd6#
      • 1...Rxa8
        • 2.Sxc5#
      • 1...Sxd3
        • 2.cxd3#
      • 1...Rb7!
    • 1.Sg4?
      • threat
        • 2.Sd6#
        • 2.Sf6#
      • 1...Rb6
        • 2.Sd6#
      • 1...Ra6
        • 2.Sd6#
      • 1...Bxg4!
    • 1.Sg6?
      • threat
        • 2.Sd6#
        • 2.Qe8#
      • 1...Rxa8
        • 2.Sd6#
      • 1...Rb6
        • 2.Sd6#
      • 1...Rb8
        • 2.Sd6#
      • 1...Ra6
        • 2.Sd6#
      • 1...Bg4
        • 2.Sd6#
      • 1...Sd3
        • 2.Sd6#
        • 2.cxd3#
      • 1...Bxg6!
    • 1.Sf7?
      • threat
        • 2.Scd6#
        • 2.Sg5#
        • 2.Sfd6#
        • 2.Qe8#
      • 1...Rxa8
        • 2.Scd6#
        • 2.Sg5#
        • 2.Sfd6#
      • 1...Rb6
        • 2.Scd6#
        • 2.Sg5#
      • 1...Rb8
        • 2.Scd6#
        • 2.Sg5#
        • 2.Sfd6#
      • 1...Ra6
        • 2.Scd6#
        • 2.Sg5#
      • 1...Bg4
        • 2.Scd6#
        • 2.Sg5#
        • 2.Sfd6#
      • 1...Sd3
        • 2.Scd6#
        • 2.Sg5#
        • 2.Sfd6#
        • 2.cxd3#
      • 1...Bxf7!
    • 1.d6+?
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rxa8!
  • Keys
    • 1.Sxf3!
      • threat
        • 2.Sg5#
      • 1...Kxf3
        • 2.Se5#
      • 1...Bxf3
        • 2.Qe8#
      • 1...Sxf3
        • 2.Re2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);OGATE::P(B),XS(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • R(E)+S(F),DCHECK
      • Vars
        • R(f);N_GUARD,XQ(J)::S(H),XP(g)
        • S(a);OGATE,XS(H)::P(B),XS(a)
      • Refutation
        • R(b);
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::R(E)+S(F),DCHECK
        • R(f);::R(E)+S(F),DCHECK
      • Refutation
        • B(h);XS(H)
    • Try
      • S(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XQ(J)::R(E)+S(F),DCHECK
        • R(b);::R(E)+S(F),DCHECK
        • R(f);::R(E)+S(F),DCHECK
        • B(h);::R(E)+S(F),DCHECK
      • Refutation
        • B(h);XS(H)
    • Try
      • S(H);
      • Threat
        • DUALS(4)
      • Refutation
        • B(h);XS(H)
    • Try
      • P(G);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB(J),XR(b)
      • Refutation
        • R(f);XQ(J)
  • Actual
    • S(H);XP(c)
    • Threat
      • S(H)
    • Vars
      • K(d);S_FLIGHT,XS(H)::S(F)
      • B(h);N_GUARD,SBLOCK,XS(H)::QAR(J)
      • S(a);SBLOCK,XS(H)::R(C)
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