MESON Chess Problem Database

Problem Display
PID: 264441 (8/8/3p1K2/5p2/2p1k3/8/3QB3/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 1992

8/8/3p1K2/5p2/2p1k3/8/3QB3/8

#2

3 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Bxc4?
      • threat
        • 2.Bd5#
      • 1...d5
        • 2.Bxd5#
      • 1...Kf3!
    • 1.Qe3+?
      • 1...Kd5
        • 2.Bf3#
      • 1...Kxe3!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Qxc4#
      • 1...Kxf4!
    • 1.Qd3+?
      • 1...Kf4
        • 2.Qf3#
      • 1...cxd3!
  • Keys
    • 1.Qc3!
      • 1...Kf4
        • 2.Qf3#
      • 1...Kd5
        • 2.Qxc4#
      • 1...f4
        • 2.Bf3#
      • 1...d5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(B);XP(a)
      • Threat
        • B(B)
      • Vars
        • P(d);::B(B),XP(d)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_GUARD,S_FLIGHT::B(B)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::QAR1(A)
      • Refutation
        • P(a);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(b);N_GUARD,P-FLIGHT::QAR1(A)
      • K(b);N_GUARD,S_FLIGHT::QAB1(A),XP(a)
      • P(c);SBLOCK::B(B)
      • P(d);N_GUARD::QAR1(A)
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