MESON Chess Problem Database

Problem Display
PID: 177534 (4n2K/2r1r2b/8/NR6/3k4/3q2N1/2PQ1P2/b3B3 w - - 0 1)

Brabec, Juraj

Postsjakk, 1963

4n2K/2r1r2b/8/NR6/3k4/3q2N1/2PQ1P2/b3B3

#2

8 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Sb3#
    • 1...Re3
      • 2.fxe3#
    • 1...Re4
      • 2.Qxd3#
    • 1...Be4
      • 2.Se2#
    • 1...Bg8
      • 2.Qxd3#
  • Tries
    • 1.Qf4+?
      • 1...Qe4
        • 2.Se2#
      • 1...Be4
        • 2.Sf5#
      • 1...Re4!
  • Keys
    • 1.Qb4+!
      • 1...Qc4
        • 2.Sb3#
      • 1...Rc4
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(d);SBLOCK::S(F)
    • R(e);OGATE::P(D),XR(e)
    • R(e);S_CUTB(f)::QAR1(C),XQ(b)
    • B(f);SBLOCK,S_CUTR(e)::S(E)
    • B(f);N_GUARD::QAR1(C),XQ(b)
  • Tries
    • Try
      • Q(C);CHECK,N_PINQ(b)
      • Vars
        • Q(b);P_SPINQ(b)::S(E)
        • B(f);P_SPINB(f)::S(E)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • Q(C);CHECK,N_PINQ(b)
    • Vars
      • Q(b);P_SPINQ(b)::S(F)
      • R(d);P_SPINR(d)::S(F)
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