MESON Chess Problem Database

Problem Display
PID: 133653 (4K1k1/8/5BPr/8/4Q3/8/b7/8 w - - 0 1)

Lincoln, Robert A

British Chess Magazine, 2003

4K1k1/8/5BPr/8/4Q3/8/b7/8

#2

4 + 3

145 StrateGems 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg6
      • 2.Qxg6#
    • 1...Rh7
      • 2.gxh7#
    • 1...Bb1
      • 2.Qd5#
      • 2.Qc4#
      • 2.Qe6#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Be6
      • 2.Qxe6#
    • 1...Bf7+
      • 2.gxf7#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qg7#
      • 1...Bf7+
        • 2.Qxf7#
      • 1...Rh7
        • 2.Qxh7#
        • 2.gxh7#
      • 1...Rxg6!
    • 1.Qe7?
      • threat
        • 2.Qf8#
        • 2.Qg7#
      • 1...Bf7+
        • 2.Qxf7#
      • 1...Rh7
        • 2.Qf8#
        • 2.Qxh7#
        • 2.gxh7#
      • 1...Rxg6!
  • Keys
    • 1.Ke7!
      • threat
        • 2.Qa8#
      • 1...Rh7+
        • 2.gxh7#
      • 1...Rxg6
        • 2.Qxg6#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Be6
        • 2.Qxe6#
      • 1...Bf7
        • 2.gxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(b);OGATE,XP(C)::QAR2(A),XR(b)
    • R(b);OGATE::P(C),XR(b)
    • B(a);N_GUARD::QAB(A),XB(a)
    • B(a);CHECK,OGATE::P(C),XB(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
      • Refutation
        • R(b);XP(C)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,N_GUARD::QAB1(A),XB(a)
      • Refutation
        • R(b);XP(C)
  • Actual
    • K(D);P-FLIGHT
    • Threat
      • QAR(A)
    • Vars
      • R(b);CHECK,OGATE::P(C),XR(b)
      • R(b);OGATE,XP(C)::QAR2(A),XR(b)
      • B(a);N_GUARD::QAB(A),XB(a)
      • B(a);OGATE::P(C),XB(a)
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