MESON Chess Problem Database

Problem Display
PID: 109286 (8/4n3/6R1/2b1k3/4PN2/Bp1P4/4K1P1/r5Q1 w - - 0 1)

Ryall, Louise Brett Georgina

Toronto Globe, 1881

8/4n3/6R1/2b1k3/4PN2/Bp1P4/4K1P1/r5Q1

#2

8 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf4
      • 2.Qh2#
    • 1...Bd4
      • 2.Bd6#
    • 1...Bb6
      • 2.Bd6#
    • 1...Bd6
      • 2.Bxd6#
    • 1...Ba7
      • 2.Bd6#
  • Tries
    • 1.Bb2+?
      • 1...Kxf4
        • 2.Qh2#
        • 2.g3#
      • 1...Bd4!
    • 1.Qxc5+?
      • 1...Kxf4
        • 2.Qd6#
        • 2.Qg5#
        • 2.Qc7#
        • 2.g3#
      • 1...Sd5!
    • 1.Qxa1+?
      • 1...Kxf4
        • 2.g3#
      • 1...Bd4
        • 2.Bd6#
      • 1...b2!
  • Keys
    • 1.Qd4+!
      • 1...Kxd4
        • 2.Bb2#
      • 1...Kxf4
        • 2.g3#
      • 1...Bxd4
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(d);OGATEB,S_FLIGHT,XS(G)::QAB(A)
    • B(c);OGATE::B(D)
    • B(c);OGATE::B(D),XB(c)
  • Tries
    • Try
      • B(D);CHECK
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(A);CHECK,XB(c)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • Q(A);CHECK,XR(a)
      • Vars
        • K(d);S_FLIGHT,XS(G)::P(C)
        • B(c);OGATE,P_SPINB(c)::B(D)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(d);S_FLIGHT,XQ(A)::B(D)
      • K(d);S_FLIGHT,XS(G)::P(C)
      • B(c);OGATE,SBLOCK,XQ(A)::B(D)
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