MESON Chess Problem Database

Problem Display
PID: 144925 (7K/5kB1/R1n5/1R6/Bn2N3/8/8/6Q1 w - - 0 1)

Thompson, Walter Hood

Chess Amateur (The), 1922

7K/5kB1/R1n5/1R6/Bn2N3/8/8/6Q1

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Rb7#
    • 1...Sa7
      • 2.Rb7#
  • Tries
    • 1.Rb7+?
      • 1...Ke8
        • 2.Ra8#
      • 1...Se7
        • 2.Sg5#
        • 2.Rf6#
        • 2.Qf2#
        • 2.Qf1#
        • 2.Qg6#
      • 1...Ke6!
  • Keys
    • 1.Qa7+!
      • 1...Ke6
        • 2.Re5#
      • 1...Kg6
        • 2.Rg5#
      • 1...Ke8
        • 2.Rb8#
      • 1...Sxa7
        • 2.Rb7#
      • 1...Se7
        • 2.Rf5#

This is a version of 21917

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::R(D)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(c);P_SPINS(b),S_FLIGHT::R(E)
      • Refutation
        • K(c);P_SPINS(b),S_FLIGHT
  • Actual
    • Q(A);CHECK
    • Vars
      • K(c);P_SPINS(b),S_FLIGHT::R1(D)
      • K(c);S_FLIGHT::R(D)
      • S(b);N_GUARD,XQ(A)::R(D)
      • S(b);P_SPINS(b)::R(D)
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