MESON Chess Problem Database

Problem Display
PID: 54301 (8/8/8/1N6/8/8/kp2B3/1n1QK3 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 2004

8/8/8/1N6/8/8/kp2B3/1n1QK3

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sc3#
    • 1...Sc3
      • 2.Bc4#
  • Tries
    • 1.Sc3+?
      • 1...Ka1
        • 2.Qxb1#
      • 1...Ka3
        • 2.Qa4#
      • 1...Sxc3!
  • Keys
    • 1.Bd3!
      • 1...Ka1
        • 2.Qxb1#
      • 1...Sd2
        • 2.Qa4#
      • 1...Sa3
        • 2.Sc3#
      • 1...Sc3
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,SBLOCK::S(D)
    • S(a);::B(C)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a)::QAR1(A),XS(a)
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • S(a);XS(D)
  • Actual
    • B(C);
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR1(A),XS(a)
      • S(a);N_GUARD::QAR2(A)
      • S(a);N_GUARD,SBLOCK::S(D)
      • S(a);::B(C)
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