MESON Chess Problem Database

Problem Display
PID: 908 (7K/8/6kp/2Q5/7B/4N3/8/1b6 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 1992

7K/8/6kp/2Q5/7B/4N3/8/1b6

#2

4 + 3

3713 Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Qf5#
    • 1...Bf5
      • 2.Qxf5#
  • Tries
    • 1.Qf8?
      • threat
        • 2.Qe8#
      • 1...Ba2
        • 2.Qf5#
      • 1...h5
        • 2.Qg7#
        • 2.Qf6#
      • 1...Kh5!
    • 1.Qe5?
      • threat
        • 2.Qe8#
      • 1...h5
        • 2.Qf6#
        • 2.Qg7#
        • 2.Qe6#
      • 1...Ba2
        • 2.Qf5#
      • 1...Kf7!
    • 1.Qg5+?
      • 1...Kf7
        • 2.Qg8#
      • 1...hxg5!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qe8#
      • 1...Kh5
        • 2.Qg4#
      • 1...Kf7
        • 2.Qg8#
      • 1...Ba2
        • 2.Qf5#
      • 1...h5
        • 2.Qe6#

Anticipated by 133149(1979)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAB1(C)
    • B(a);N_GUARD::QAB1(C),XB(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB(C)
      • Vars
        • B(a);N_GUARD::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB(C)
      • Vars
        • B(a);N_GUARD::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • P(c);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
      • B(a);N_GUARD::QAB1(C)
      • P(c);SBLOCK::QAR2(C)
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