MESON Chess Problem Database

Problem Display
PID: 55187 (7Q/RP6/2k1p3/8/3P4/3K4/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2004

7Q/RP6/2k1p3/8/3P4/3K4/8/8

#2

5 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qe5?
      • 1...Kb6
        • 2.Qc5#
      • 1...Kd7!
    • 1.Qh1+?
      • 1...Kb5
        • 2.b8Q#
        • 2.b8R#
      • 1...Kb6
        • 2.b8Q#
      • 1...Kd6
        • 2.b8Q#
        • 2.b8B#
      • 1...Kd7
        • 2.b8Q#
      • 1...Kc7!
    • 1.Qc8+?
      • 1...Kb5
        • 2.Qc5#
        • 2.b8Q#
        • 2.b8R#
      • 1...Kd5
        • 2.Qd7#
        • 2.Qc5#
      • 1...Kb6
        • 2.Qc5#
        • 2.b8Q#
      • 1...Kd6!
    • 1.Qe8+?
      • 1...Kd5
        • 2.Qd7#
      • 1...Kb6
        • 2.b8Q#
      • 1...Kc7
        • 2.b8Q#
      • 1...Kd6!
    • 1.b8Q?
      • threat
        • 2.Qh1#
      • 1...Kd5
        • 2.Qh1#
      • 1...e5!
  • Keys
    • 1.Qa8!
      • threat
        • 2.b8Q#
      • 1...Kb5
        • 2.b8Q#
        • 2.b8R#
      • 1...Kd5
        • 2.b8Q#
        • 2.b8B#
      • 1...Kb6
        • 2.b8Q#
        • 2.b8R#
      • 1...Kd6
        • 2.b8Q#
        • 2.b8B#
      • 1...Kc7
        • 2.b8Q#
      • 1...Kd7
        • 2.b8Q#

Anticipated by 9404(1902), 17133(1902), 151464(1908), 164804(1978)

This is after

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::P=Q
        • K(a);P-FLIGHT::P=Q
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(E)
        • K(a);P-FLIGHT::P=Q
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(D);
      • Threat
        • QAB(E)
      • Vars
        • K(a);S_FLIGHT::QAB(E)
      • Refutation
        • P(b);
  • Actual
    • Q(E);
    • Threat
      • P=Q
    • Vars
      • K(a);S_FLIGHT::P=Q
      • K(a);P-FLIGHT::P=Q
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