MESON Chess Problem Database

Problem Display
PID: 84811 (8/2Qpp3/1P2P3/P2p2K1/2pkp3/2RPR3/N2N1P2/8 w - - 0 1)

Petite, Efren

Die Schwalbe, 1996

8/2Qpp3/1P2P3/P2p2K1/2pkp3/2RPR3/N2N1P2/8

#2

11 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...cxd3
      • 2.Sb3#
    • 1...exd3
      • 2.Sf3#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Rxc4#
        • 2.Rxe4#
      • 1...cxd3
        • 2.Sb3#
        • 2.Rc4#
        • 2.Rxe4#
      • 1...exd3
        • 2.Sf3#
        • 2.Rxc4#
        • 2.Re4#
      • 1...exd6!
    • 1.Qc5+?
      • 1...Ke5
        • 2.Rxe4#
      • 1...Kxc5!
  • Keys
    • 1.Qxd7!
      • 1...Kc5
        • 2.Sb3#
      • 1...Ke5
        • 2.Sf3#
      • 1...cxd3
        • 2.Rxe4#
      • 1...exd3
        • 2.Rxc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);N_GUARD,XP(E)::S(B)
    • P(c);N_GUARD,XP(E)::S(B)
  • Tries
    • Try
      • Q(K);P_PINP(d)
      • Threat
        • DUALS(2)
      • Refutation
        • P(f);N_SPINP(d),XQ(K)
    • Try
      • Q(K);CHECK
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::R1(F),XP(c)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XQ(K)
  • Actual
    • Q(K);P_PINP(d),XP(e)
    • Vars
      • K(b);N_SPINP(d),P_SPINP(a),S_FLIGHT::S(B)
      • K(b);N_SPINP(d),P_SPINP(c),S_FLIGHT::S(B)
      • P(a);XP(E)::R1(F),XP(c)
      • P(c);XP(E)::R1(D),XP(a)
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