MESON Chess Problem Database

Problem Display
PID: 68450 (8/8/8/8/4B3/4Q3/4n3/4kNnK w - - 0 1)

Lincoln, Robert A

Problem Observer, 2006

8/8/8/8/4B3/4Q3/4n3/4kNnK

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd1
      • 2.Qd2#
  • Tries
    • 1.Kg2?
      • threat
        • 2.Qd2#
      • 1...Kd1
        • 2.Qd2#
      • 1...Sf3!
    • 1.Sg3?
      • 1...Sf3
        • 2.Qxe2#
      • 1...Sh3
        • 2.Qxe2#
      • 1...Kd1!
  • Keys
    • 1.Bd3!
      • 1...Kd1
        • 2.Qd2#
      • 1...Kxf1
        • 2.Qxg1#
      • 1...Sf3
        • 2.Qxe2#
      • 1...Sh3
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINS(c),P-FLIGHT::QAR1(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAB1(C)
      • Vars
        • K(a);N_SPINS(c),P-FLIGHT::QAR1(C)
      • Refutation
        • S(b);
    • Try
      • S(A);
      • Vars
        • S(b);N_GUARD::QAR1(C),XS(c)
      • Refutation
        • K(a);N_SPINS(c),P-FLIGHT
  • Actual
    • B(D);
    • Vars
      • K(a);N_SPINS(c),P-FLIGHT::QAR1(C)
      • K(a);OGATEB,P-FLIGHT,XS(A)::QAR1(C),XS(b)
      • S(b);N_GUARD::QAR1(C),XS(c)
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