MESON Chess Problem Database

Problem Display
PID: 153143 (N7/1pN4Q/2kp4/8/8/3K4/8/8 w - - 0 1)

Lincoln, Robert A

4th HM., Seven Chess Notes, 2010

N7/1pN4Q/2kp4/8/8/3K4/8/8

#2

4 + 3

145 StrateGems 2011

SOLUTION

  • SOUND
  • Tries
    • 1.Qf5?
      • threat
        • 2.Qb5#
      • 1...d5
        • 2.Qxd5#
      • 1...b5
        • 2.Qxb5#
      • 1...b6!
    • 1.Qh5?
      • threat
        • 2.Qb5#
      • 1...Kd7
        • 2.Qe8#
      • 1...d5
        • 2.Qxd5#
      • 1...b5
        • 2.Qxb5#
      • 1...b6!
    • 1.Qd7+?
      • 1...Kc5
        • 2.Qb5#
      • 1...Kxd7!
  • Keys
    • 1.Qe4+!
      • 1...Kc5
        • 2.Qc4#
      • 1...Kd7
        • 2.Qe8#
      • 1...d5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(b);::QAB1(C),XP(b)
        • P(c);::QAB1(C),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
        • P(b);::QAB1(C),XP(b)
        • P(c);::QAB1(C),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR1(C)
      • K(a);S_FLIGHT::QAB1(C)
      • P(b);P_SPINP(b)::QAB1(C),XP(b)
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