MESON Chess Problem Database

Problem Display
PID: 54368 (7B/8/2K5/8/pk6/3P4/1P6/Q7 w - - 0 1)

Lincoln, Robert A

2nd HM., Amirov MT, 2003

7B/8/2K5/8/pk6/3P4/1P6/Q7

#2

5 + 2

145 StrateGems 2004

SOLUTION

  • SOUND
  • Sets
    • 1...a3
      • 2.Qxa3#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Qa3#
      • 1...a3
        • 2.Qxa3#
      • 1...Kb3!
    • 1.Qa2?
      • threat
        • 2.Bc3#
      • 1...a3
        • 2.Qxa3#
      • 1...Ka5!
  • Keys
    • 1.b3!
      • threat
        • 2.Qxa4#
      • 1...Kxb3
        • 2.Qb2#
      • 1...Ka5
        • 2.Qxa4#
      • 1...axb3
        • 2.Bc3#
      • 1...a3
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);::QAB1(A),XP(a)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAB1(A)
      • Vars
        • P(a);::QAB1(A),XP(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • B(E)
      • Vars
        • P(a);::QAB1(A),XP(a)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
  • Actual
    • P(B);
    • Threat
      • QAR1(A),XP(a)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR1(A)
      • K(b);P_SPINP(a),S_FLIGHT::QAR1(A),XP(a)
      • P(a);SBLOCK,XP(B)::B(E)
      • P(a);SBLOCK::QAB1(A)
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