MESON Chess Problem Database

Problem Display
PID: 175778 (2B5/2p5/4p3/3k1p2/5pN1/B1K5/8/1Q2n3 w - - 0 1)

McAllister, George W

Philadelphia Times, 1898

2B5/2p5/4p3/3k1p2/5pN1/B1K5/8/1Q2n3

#2

5 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Qb7#
  • Tries
    • 1.Sf6+?
      • 1...Kc6
        • 2.Bb7#
        • 2.Bd7#
        • 2.Qb7#
      • 1...Ke5!
    • 1.Bxe6+?
      • 1...Kc6
        • 2.Se5#
      • 1...Kxe6!
    • 1.Qb3+?
      • 1...Kc6
        • 2.Se5#
        • 2.Qb7#
      • 1...Ke4!
    • 1.Qb5+?
      • 1...Ke4
        • 2.Qc6#
      • 1...c5!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxe6#
      • 1...Ke4
        • 2.Qc6#
      • 1...cxb6
        • 2.Bb7#
      • 1...e5
        • 2.Sf6#
      • 1...c6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(c);S_FLIGHT::QAB1(A)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • B(E);CHECK,XP(e)
      • Vars
        • K(c);S_FLIGHT::S(D)
      • Refutation
        • K(c);S_FLIGHT,XB(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB(A)
      • Refutation
        • P(f);P_SPINP(f)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XP(e)
    • Vars
      • K(c);S_FLIGHT::QAB(A)
      • P(f);N_GUARD,XQ(A)::B(E)
      • P(e);SBLOCK::S(D)
      • P(f);SBLOCK::QAR1(A)
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