MESON Chess Problem Database

Problem Display
PID: 2710 (4B3/p7/8/8/4kp2/5N2/7P/3K1Q2 w - - 0 1)

Swan, John P

Source?, 0000

4B3/p7/8/8/4kp2/5N2/7P/3K1Q2

#2

5 + 3

1679 American Chess Nuts 1868
5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Qe2#
  • Tries
    • 1.Bc6+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kf5!
    • 1.Bg6+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kd5!
    • 1.Qc4+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kxf3
        • 2.Qe2#
      • 1...Kf5!
  • Keys
    • 1.Qa6!
      • 1...Ke3
        • 2.Qe2#
      • 1...Kxf3
        • 2.Qe2#
      • 1...Kd5
        • 2.Qc6#
      • 1...Kf5
        • 2.Qg6#

This anticipates 223479(1926), 79544(1970), 24218(1980), 245479(2000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR1(B)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • K(a);S_FLIGHT,XS(D)::QAB1(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);S_FLIGHT,XS(D)::QAB1(B)
      • K(a);S_FLIGHT::QAB1(B)
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