MESON Chess Problem Database

Problem Display
PID: 165283 (3B2K1/3p4/4k1p1/8/3Q4/8/2B5/8 w - - 0 1)

Lincoln, Robert A

British Chess Magazine, 2017

3B2K1/3p4/4k1p1/8/3Q4/8/2B5/8

#2

4 + 3

5454 Near Snap 2017
3713 Snap 2017

SOLUTION

  • SOUND
  • Tries
    • 1.Bd1?
      • threat
        • 2.Bg4#
      • 1...Kf5
        • 2.Bg4#
      • 1...d5!
    • 1.Bb3+?
      • 1...d5
        • 2.Qxd5#
      • 1...Kf5!
    • 1.Be4?
      • threat
        • 2.Qf6#
        • 2.Qd5#
      • 1...d5
        • 2.Qxd5#
      • 1...d6!
    • 1.Bc7?
      • threat
        • 2.Qe5#
        • 2.Qd6#
      • 1...Ke7
        • 2.Qe5#
      • 1...d6
        • 2.Qxd6#
      • 1...d5!
    • 1.Qc5?
      • 1...d5
        • 2.Qe7#
      • 1...g5
        • 2.Bf5#
      • 1...d6!
  • Keys
    • 1.Ba4!
      • threat
        • 2.Bxd7#
      • 1...Kf5
        • 2.Bxd7#
      • 1...d5
        • 2.Qf6#
      • 1...d6
        • 2.Qe4#

Anticipated by 24230(1995), 24246(1997)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);
      • Threat
        • B(A)
      • Vars
        • K(a);S_FLIGHT::B(A)
      • Refutation
        • P(c);
    • Try
      • B(A);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(B),XP(c)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAB1(B),XP(c)
      • Refutation
        • P(c);
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • P(c);::QAR1(B),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • P(c);SBLOCK::QAR1(B)
        • P(b);N_GUARD::B(A)
      • Refutation
        • P(c);
  • Actual
    • B(A);
    • Threat
      • B(A),XP(c)
    • Vars
      • K(a);S_FLIGHT::B(A),XP(c)
      • P(c);SBLOCK::QAR1(B)
      • P(c);SBLOCK::QAR2(B)
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