MESON Chess Problem Database

Problem Display
PID: 39681 (8/K1B5/8/1kp5/1N6/8/8/1Q1B4 w - - 0 1)

Lincoln, Robert A

The Problemist, 2001

8/K1B5/8/1kp5/1N6/8/8/1Q1B4

#2

5 + 2

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sc6+?
      • 1...Kc4
        • 2.Qb3#
      • 1...Kxc6!
    • 1.Ba5?
      • 1...Kc4
        • 2.Qd3#
      • 1...Kxa5
        • 2.Sc6#
      • 1...c4
        • 2.Qf5#
      • 1...cxb4!
    • 1.Qc2?
      • 1...Kxb4
        • 2.Qb3#
      • 1...cxb4
        • 2.Be2#
      • 1...c4!
    • 1.Qd3+?
      • 1...Kxb4
        • 2.Qb3#
      • 1...c4!
    • 1.Qe4?
      • 1...cxb4
        • 2.Qd5#
      • 1...c4!
    • 1.Qb3?
      • 1...cxb4
        • 2.Qd5#
      • 1...c4!
  • Keys
    • 1.Qa2!
      • 1...Kxb4
        • 2.Qb3#
      • 1...cxb4
        • 2.Qd5#
      • 1...c4
        • 2.Qa5#

Anticipated by 103836(1993), 16231(2000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • B(E);
      • Vars
        • K(a);S_FLIGHT::QAB1(A)
        • K(a);P-FLIGHT,XB(E)::S(C)
        • P(b);OGATEB,SBLOCK::QAR(A)
      • Refutation
        • P(b);P_SPINP(b),XS(C)
    • Try
      • Q(A);
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(C)::QAR1(A)
        • P(b);N_GUARD,SBLOCK,XS(C)::B(B)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATEB,P-FLIGHT,XS(C)::QAR1(A)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);
      • Vars
        • P(b);OGATEB,SBLOCK,XS(C)::QAR2(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Vars
        • P(b);OGATEB,P_SPINP(b),SBLOCK,XS(C)::QAR2(A)
      • Refutation
        • P(b);
  • Actual
    • Q(A);
    • Vars
      • K(a);OGATEB,P-FLIGHT,XS(C)::QAR1(A)
      • P(b);OGATEB,SBLOCK,XS(C)::QAR2(A)
      • P(b);SBLOCK::QAR1(A)
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