MESON Chess Problem Database

Problem Display
PID: 22924 (4B3/8/8/3K4/7Q/8/3Bk3/8 w - - 0 1)

van Dijk, Nils Gustav Gerard

Land og Folk, 1970

4B3/8/8/3K4/7Q/8/3Bk3/8

#2

4 + 1

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Be1?
      • 1...Kf1
        • 2.Qf2#
      • 1...Kd3
        • 2.Qe4#
      • 1...Ke3
        • 2.Qe4#
      • 1...Kf3
        • 2.Qe4#
      • 1...Kd1!
    • 1.Qe1+?
      • 1...Kd3
        • 2.Bg6#
      • 1...Kf3!
    • 1.Qf2+?
      • 1...Kd1
        • 2.Ba4#
      • 1...Kd3
        • 2.Bg6#
      • 1...Kxf2!
  • Keys
    • 1.Qh2+!
      • 1...Kd1
        • 2.Ba4#
      • 1...Kf1
        • 2.Bb5#
      • 1...Kd3
        • 2.Bg6#
      • 1...Kf3
        • 2.Bh5#

This anticipates 65343(1972), 86743(1990), 163371(1994)

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
        • K(a);S_FLIGHT::QAB1(B)
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::B(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::B(D)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
  • Actual
    • Q(B);CHECK
    • Vars
      • K(a);S_FLIGHT::B(D)
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