MESON Chess Problem Database

Problem Display
PID: 99103 (N2r4/N2k4/r4q1R/p7/2p2B2/8/Q5Bp/b3R2K w - - 0 1)

Ersek, Tibor

Magyar Sakkelet, 1987

N2r4/N2k4/r4q1R/p7/2p2B2/8/Q5Bp/b3R2K

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Rh7+?
      • 1...Qe7
        • 2.Rexe7#
        • 2.Rhxe7#
      • 1...Qf7
        • 2.Rxf7#
      • 1...Qg7!
    • 1.Qd2+?
      • 1...Qd4
        • 2.Rh7#
      • 1...Qd6
        • 2.Bh3#
      • 1...Rd6
        • 2.Bc6#
      • 1...Bd4!
  • Keys
    • 1.Qa4+!
      • 1...Qc6
        • 2.Rd6#
      • 1...Rc6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • Q(f);N_GUARD,P_SPINQ(f)::R(F),XQ(f)
      • Refutation
        • Q(f);P_SPINQ(f)
    • Try
      • Q(C);CHECK
      • Vars
        • Q(f);P_SPINQ(f)::R(F)
        • Q(f);P_SPINQ(f)::B(D)
        • R(e);P_SPINR(e)::B(D)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • Q(C);CHECK
    • Vars
      • Q(f);OGATE,P_PINB(D),P_SPINQ(f)::R1(F)
      • R(e);P_SPINR(e)::S(H)
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