MESON Chess Problem Database

Problem Display
PID: 266833 (8/1p3Qn1/8/1p6/4k3/2PN4/2BP4/2K5 w - - 0 1)

Lincoln, Robert A

The Problemist, 1998

8/1p3Qn1/8/1p6/4k3/2PN4/2BP4/2K5

#2

6 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qxb7#
  • Tries
    • 1.Bd1?
      • threat
        • 2.Qf3#
      • 1...Kxd3
        • 2.Qd5#
      • 1...Sf5!
    • 1.Bb3?
      • threat
        • 2.Qd5#
      • 1...Kxd3
        • 2.Qf3#
      • 1...Se6!
  • Keys
    • 1.Qg6+!
      • 1...Kf3
        • 2.Bd1#
      • 1...Kd5
        • 2.Bb3#
      • 1...Sf5
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(d);SBLOCK::QAB(F),XP(c)
  • Tries
    • Try
      • B(B);
      • Threat
        • QAB1(F)
      • Vars
        • K(a);N_GUARD,S_FLIGHT,XS(E)::QAR2(F)
      • Refutation
        • S(d);
    • Try
      • B(B);
      • Threat
        • QAB1(F)
      • Vars
        • K(a);N_GUARD,S_FLIGHT,XS(E)::QAR2(F)
      • Refutation
        • S(d);
  • Actual
    • Q(F);CHECK
    • Vars
      • K(a);N_GUARD,S_CUTS(d),S_FLIGHT::B(B)
      • S(d);P_SPINS(d),SBLOCK::QAB(F)
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