MESON Chess Problem Database

Problem Display
PID: 262365 (8/1Q6/8/4k3/1NK4B/8/8/8 w - - 0 1)

Oneguine, E

Europe Echecs, 1986

8/1Q6/8/4k3/1NK4B/8/8/8

#2

4 + 1

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qe7#
    • 1...Ke6
      • 2.Qd5#
  • Tries
    • 1.Bg5?
      • threat
        • 2.Qd5#
      • 1...Kd6
        • 2.Qe7#
      • 1...Ke6
        • 2.Qd5#
      • 1...Kf5!
    • 1.Qf3?
      • 1...Ke6
        • 2.Qd5#
      • 1...Kd6!
    • 1.Qe4+?
      • 1...Kd6
        • 2.Qe7#
      • 1...Kxe4!
    • 1.Qf7?
      • 1...Kd6
        • 2.Bg3#
        • 2.Qe7#
      • 1...Ke4!
  • Keys
    • 1.Kd3!
      • 1...Kf4
        • 2.Qe4#
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd6
        • 2.Qe7#
      • 1...Ke6
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);N_GUARD,S_FLIGHT::QAB1(D)
    • K(a);N_GUARD,P-FLIGHT::QAB1(D)
  • Tries
    • Try
      • B(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(a);N_GUARD,S_FLIGHT::QAB1(D)
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(a);N_GUARD,P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT,XQ(D)
    • Try
      • Q(D);
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • K(a);N_GUARD,S_FLIGHT::QAR1(D)
      • K(a);N_GUARD,P-FLIGHT::QAB1(D)
      • K(a);N_GUARD,S_FLIGHT::QAB1(D)
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