MESON Chess Problem Database

Problem Display
PID: 71239 (7K/P5PN/3p4/1Qpk4/2rP2BR/8/2nPP3/qb2n1b1 w - - 0 1)

Chelebi, Edgard J

Le Probleme, 1962

7K/P5PN/3p4/1Qpk4/2rP2BR/8/2nPP3/qb2n1b1

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Be6#
  • Tries
    • 1.Bf3+?
      • 1...Sxf3
        • 2.g8Q#
        • 2.g8B#
      • 1...Ke6!
    • 1.g8Q+?
      • 1...Ke4
        • 2.Bh3#
        • 2.Be6#
        • 2.Bd7#
        • 2.Bc8#
      • 1...Kxd4!
    • 1.g8B+?
      • 1...Ke4
        • 2.Bh3#
        • 2.B4e6#
        • 2.Bd7#
        • 2.Bc8#
      • 1...Kxd4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Be6#
      • 1...Kxd4
        • 2.Bf3#
      • 1...Qxd4
        • 2.a8Q#
        • 2.a8B#
      • 1...Rxd4
        • 2.g8Q#
        • 2.g8B#
      • 1...Bxd4
        • 2.e4#
      • 1...Sxd4
        • 2.Sf6#
      • 1...cxd4
        • 2.Rh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(h);N_SPINP(g),S_FLIGHT::R(E)+B(D)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • S(c);XB(D)::P=Q
      • Refutation
        • K(h);N_SPINP(g),S_FLIGHT
    • Try
      • P(H);CHECK,P_SPINP(C)
      • Refutation
        • K(h);N_SPINP(g),P-FLIGHT,XP(C)
    • Try
      • P(H);CHECK,P_SPINP(C)
      • Refutation
        • K(h);N_SPINP(g),P-FLIGHT,XP(C)
  • Actual
    • Q(F);N_PINP(g)
    • Threat
      • B(D)
    • Vars
      • K(h);P-FLIGHT,XP(C)::R(E)+B(D)
      • Q(a);N_GUARD,P_PINP(H),SBLOCK,XP(C)::P=Q
      • R(f);SBLOCK,XP(C)::P=Q
      • B(d);P_PINP(H),SBLOCK,XP(C)::P(B)
      • S(e);SBLOCK,XP(C)::S(I)
      • P(g);SBLOCK,XP(C)::R(E)
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