MESON Chess Problem Database

Problem Display
PID: 932 (b7/Q2p4/1Nk3B1/8/1K3P2/8/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 1993

b7/Q2p4/1Nk3B1/8/1K3P2/8/8/8

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qxd7#
    • 1...d6
      • 2.Be8#
  • Tries
    • 1.Sc4?
      • 1...Kd5
        • 2.Qxd7#
      • 1...Bb7
        • 2.Qc5#
      • 1...d5
        • 2.Be8#
      • 1...d6!
    • 1.Sd5?
      • 1...Kxd5
        • 2.Qxd7#
      • 1...Bb7
        • 2.Qc5#
      • 1...d6
        • 2.Se7#
      • 1...Kd6!
    • 1.Be4+?
      • 1...Kd6
        • 2.Qxd7#
      • 1...d5!
    • 1.Be8?
      • 1...Kd6
        • 2.Qxd7#
      • 1...Bb7!
    • 1.Qb8?
      • 1...d5
        • 2.Be8#
      • 1...d6
        • 2.Be8#
      • 1...Bb7!
  • Keys
    • 1.Sc8!
      • 1...Kd5
        • 2.Qxd7#
      • 1...Bb7
        • 2.Qc5#
      • 1...d6
        • 2.Se7#
      • 1...d5
        • 2.Be8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR1(E),XP(b)
    • P(b);OGATEB,SBLOCK::B(D)
  • Tries
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT::QAR2(E),XP(b)
        • B(c);SBLOCK::QAR1(E)
        • P(b);OGATEB,SBLOCK::B(D)
      • Refutation
        • P(b);
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT,XS(C)::QAR2(E),XP(b)
        • B(c);SBLOCK::QAR1(E)
        • P(b);SBLOCK::S(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E),XP(b)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • B(D);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(E),XP(b)
      • Refutation
        • B(c);
    • Try
      • Q(E);
      • Vars
        • P(b);OGATEB::B(D)
      • Refutation
        • B(c);
  • Actual
    • S(C);
    • Vars
      • K(a);S_FLIGHT::QAR2(E),XP(b)
      • B(c);SBLOCK::QAR1(E)
      • P(b);SBLOCK::S(C)
      • P(b);OGATEB,SBLOCK::B(D)
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