MESON Chess Problem Database

Problem Display
PID: 109282 (3K4/8/5p2/3kr3/3B4/R7/5P2/3Q4 w - - 0 1)

Ryall, Isaac

Canadian Chess Association, 1874

3K4/8/5p2/3kr3/3B4/R7/5P2/3Q4

#2

5 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Be3+?
      • 1...Kc4
        • 2.Qb3#
      • 1...Kc6
        • 2.Qd7#
      • 1...Ke6
        • 2.Qd7#
      • 1...Ke4!
    • 1.Bb6+?
      • 1...Kc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...Ke6
        • 2.Qd7#
      • 1...Kc6!
  • Keys
    • 1.Ba7+!
      • 1...Kc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc6
        • 2.Qd7#
      • 1...Ke6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • K(a);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • B(D);CHECK
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);OGATE,S_FLIGHT::QAB1(A)
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