MESON Chess Problem Database

Problem Display
PID: 267838 (8/K2p4/1Bk5/8/p7/4N3/8/5Q2 w - - 0 1)

Lincoln, Robert A

The Problemist, 1999

8/K2p4/1Bk5/8/p7/4N3/8/5Q2

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qf6#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
      • 1...d6!
    • 1.Qc1+?
      • 1...Kb5
        • 2.Qc4#
        • 2.Qc5#
      • 1...Kd6!
    • 1.Qd1?
      • threat
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qxa4#
      • 1...Kb5!
    • 1.Qf3+?
      • 1...Kd6
        • 2.Qf6#
      • 1...d5
        • 2.Qxd5#
      • 1...Kb5!
    • 1.Qf5?
      • threat
        • 2.Qc5#
        • 2.Qd5#
      • 1...Kd6
        • 2.Qf6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6!
    • 1.Qf8?
      • threat
        • 2.Qc5#
      • 1...Kb5
        • 2.Qc5#
      • 1...d6
        • 2.Qe8#
      • 1...d5!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qd5#
      • 1...Kb5
        • 2.Qc4#
      • 1...Kd6
        • 2.Qf6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);::QAB1(A),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);::QAB1(A),XP(c)
        • P(c);SBLOCK::QAB(A),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(A)
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(A)
        • P(c);::QAB1(A),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • K(b);S_FLIGHT::QAR1(A)
        • P(c);OGATEB,SBLOCK::QAB(A)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);N_GUARD,S_FLIGHT::QAB1(A)
      • K(b);N_GUARD,P-FLIGHT,S_CUTP(c)::QAR2(A)
      • P(c);::QAB1(A),XP(c)
      • P(c);OGATEB,SBLOCK::QAB(A)
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