MESON Chess Problem Database

Problem Display
PID: 271019 (3K4/5Q1N/7k/1pn5/1r6/B1R2N2/8/bR3b2 w - - 0 1)

Graca, JGM

The Problemist, 1956

3K4/5Q1N/7k/1pn5/1r6/B1R2N2/8/bR3b2

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Bc1#
    • 1...Bc4
      • 2.Bc1#
      • 2.Rh1#
  • Tries
    • 1.Qf6+?
      • 1...Kh5
        • 2.Qg5#
      • 1...Kxh7!
    • 1.Qg7+?
      • 1...Kh5
        • 2.Sf6#
        • 2.Qg5#
      • 1...Kxg7!
  • Keys
    • 1.Bc1+!
      • 1...Rf4
        • 2.Bxf4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::B(B)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);N_GUARD,P-FLIGHT::QAR1(E)
      • Refutation
        • K(f);P-FLIGHT,XS(F)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(f);S_FLIGHT,XQ(E)
  • Actual
    • B(B);CHECK
    • Vars
      • R(c);N_GUARD,P_SPINR(c)::B(B),XR(c)
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