MESON Chess Problem Database

Problem Display
PID: 138817 (N7/8/8/pk1K4/8/1p6/8/3BQ3 w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

N7/8/8/pk1K4/8/1p6/8/3BQ3

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Be2#
  • Tries
    • 1.Bxb3?
      • 1...a4
        • 2.Bc4#
      • 1...Ka6!
    • 1.Qc3?
      • threat
        • 2.Qc4#
      • 1...Ka4
        • 2.Qxb3#
      • 1...a4
        • 2.Be2#
      • 1...Ka6!
  • Keys
    • 1.Qe3!
      • 1...Ka4
        • 2.Qxb3#
      • 1...Kb4
        • 2.Qxb3#
      • 1...Ka6
        • 2.Qb6#
      • 1...b2
        • 2.Qb6#
      • 1...a4
        • 2.Qb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::B(A)
  • Tries
    • Try
      • B(A);XP(a)
      • Vars
        • P(b);SBLOCK::B(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT::QAB1(B),XP(a)
        • P(b);SBLOCK::B(A)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(c);P_SPINP(a),S_FLIGHT::QAB1(B),XP(a)
      • K(c);P-FLIGHT::QAR1(B),XP(a)
      • K(c);S_FLIGHT::QAR1(B)
      • P(a);::QAR1(B)
      • P(b);SBLOCK::QAR1(B)
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