MESON Chess Problem Database

Problem Display
PID: 46137 (N3B1b1/1q1rRp2/1ppk1B1R/3P1P2/1P2PpK1/4p3/8/4Q3 w - - 0 1)

Avner, Uri

Comay, Ofer

Einat, Paz

1st HM., Portoroz Quick Composing Ty., 2002

N3B1b1/1q1rRp2/1ppk1B1R/3P1P2/1P2PpK1/4p3/8/4Q3

#2

11 + 9

102 Probleemblad 2002
56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Rxd7#
    • 1...Qxa8
      • 2.Rxd7#
    • 1...Qb8
      • 2.Rxd7#
    • 1...f3
      • 2.Qg3#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qe5#
      • 1...Rxe7
        • 2.Be5#
      • 1...cxd5!
    • 1.Qd1?
      • threat
        • 2.e5#
      • 1...Qxa8
        • 2.Rxd7#
      • 1...Rxe7
        • 2.dxc6#
      • 1...cxd5!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qe5#
      • 1...Rxe7
        • 2.Be5#
      • 1...cxd5
        • 2.e5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD::R1(I),XR(g)
    • Q(f);N_GUARD,XS(J)::R1(I),XR(g)
    • P(b);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(g);SBLOCK,XR(I)::R(H)+B(G),DCHECK
      • Refutation
        • P(d);XP(E)
    • Try
      • Q(A);
      • Threat
        • P(C)
      • Vars
        • Q(f);N_GUARD,XS(J)::R1(I),XR(g)
        • R(g);XR(I)::QAR(A)+P(E),XP(d)
      • Refutation
        • P(d);P_SPINP(d),XP(E)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • R(g);SBLOCK,XR(I)::R(H)+B(G),DCHECK
      • P(d);SBLOCK,XP(E)::P(C)
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