MESON Chess Problem Database

Problem Display
PID: 23290 (B7/q1QN4/prn5/1n1p4/K1k1p2R/1Nb5/8/B2R4 w - - 0 1)

Mirri, Giorgio

4th HM., The Problemist, 1997/I

B7/q1QN4/prn5/1n1p4/K1k1p2R/1Nb5/8/B2R4

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa8
      • 2.Sxb6#
    • 1...Be1
      • 2.Se5#
    • 1...Bd2
      • 2.Se5#
    • 1...Bb4
      • 2.Se5#
    • 1...Bd4
      • 2.Sa5#
    • 1...Ba5
      • 2.Sxa5#
      • 2.Se5#
    • 1...Be5
      • 2.Sa5#
      • 2.Sxe5#
    • 1...Bf6
      • 2.Sa5#
    • 1...Bg7
      • 2.Sa5#
    • 1...Bh8
      • 2.Sa5#
    • 1...Sd4
      • 2.Se5#
  • Tries
    • 1.Rd4+?
      • 1...Sxd4
        • 2.Se5#
      • 1...Bxd4!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qd3#
      • 1...d4
        • 2.Qg8#
      • 1...Bd2
        • 2.Sxd2#
      • 1...Bd4
        • 2.Sd2#
      • 1...Sbd4
        • 2.Qxc3#
      • 1...Sb4
        • 2.Sa5#
      • 1...Scd4
        • 2.Se5#
      • 1...Se5
        • 2.Bxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(i);N_GUARD,XB(H)::S(G),XR(g)
    • B(a);N_GUARD::S(G)
    • B(a);N_GUARD,N_SPINP(c)::S(C)
    • B(a);N_GUARD::S(C)
    • S(d);N_SPINP(c),S_CUTB(a)::S(G)
  • Tries
    • Try
      • R(B);CHECK,N_PINP(c)
      • Vars
        • S(d);XR(B)::S(G)
      • Refutation
        • B(a);XR(B)
  • Actual
    • Q(F);N_PINS(h)
    • Threat
      • QAB1(F)
    • Vars
      • P(e);N_SPINP(c),OGATEB::QAB(F)
      • B(a);N_GUARD::S(C),XB(a)
      • B(a);N_GUARD,N_SPINP(c)::S(C)
      • S(d);N_GUARD,N_SPINP(c)::QAR1(F),XB(a)
      • S(h);N_GUARD,S_CUTB(a)::S(C)
      • S(h);N_GUARD,N_SPINP(c),S_CUTB(a)::S(G)
      • S(h);OGATE::B(H),XP(e)
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