MESON Chess Problem Database

Problem Display
PID: 38877 (K7/1n2B3/4p3/3k4/8/3P4/1Q6/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 1990

K7/1n2B3/4p3/3k4/8/3P4/1Q6/8

#2

4 + 3

2786 More Fun with Chess Miniatures 2000

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qxb7#
  • Tries
    • 1.Qc3?
      • 1...Sc5
        • 2.Qxc5#
      • 1...e5
        • 2.Qc4#
      • 1...Sa5
        • 2.Qc5#
      • 1...Sd8
        • 2.Qc5#
      • 1...Sd6!
    • 1.Qg2+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Kd4!
    • 1.Qb5+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Kd4!
    • 1.Qxb7+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Kd4!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qe4#
      • 1...Ke5
        • 2.Qe4#
      • 1...Kc6
        • 2.Qxb7#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sd6
        • 2.Qxd6#
      • 1...e5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB1(A),XS(c)
  • Tries
    • Try
      • Q(A);
      • Vars
        • S(c);N_GUARD::QAR1(A),XS(c)
        • P(b);SBLOCK::QAB1(A)
        • S(c);N_GUARD::QAR1(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK,XS(c)
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • K(a);P-FLIGHT::QAR1(A)
      • K(a);S_FLIGHT::QAB1(A),XS(c)
      • S(c);N_GUARD::QAR1(A),XS(c)
      • P(b);SBLOCK::QAB1(A)
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