MESON Chess Problem Database

Problem Display
PID: 171022 (k1K5/b1n5/8/8/6n1/8/QN6/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

k1K5/b1n5/8/8/6n1/8/QN6/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sa6
      • 2.Qd5#
    • 1...Se6
      • 2.Qd5#
    • 1...Se8
      • 2.Qd5#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sb6#
      • 1...Sa6
        • 2.Qg2#
      • 1...Sd5!
    • 1.Qb3?
      • threat
        • 2.Qb7#
      • 1...Sb5
        • 2.Qd5#
        • 2.Qf3#
      • 1...Bb6!
    • 1.Qa4?
      • threat
        • 2.Qc6#
      • 1...Sb5
        • 2.Qe4#
      • 1...Se5!
    • 1.Qa6?
      • threat
        • 2.Qb7#
        • 2.Qc6#
      • 1...Se5
        • 2.Qb7#
      • 1...Sxa6!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Sb6#
      • 1...Bb6
        • 2.Sxb6#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sa6
        • 2.Qd5#
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • S(c);N_GUARD::QAB(A)
    • S(c);N_GUARD::QAB(A),XS(c)
    • S(c);N_GUARD,N_SPINB(b)::QAB(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • S(c);N_GUARD,N_SPINB(b)::QAB(A)
      • Refutation
        • S(c);
    • Try
      • Q(A);N_PINB(b)
      • Threat
        • QAB1(A)
      • Refutation
        • B(b);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(c);N_GUARD::QAB(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB1(A)
      • Refutation
        • S(c);N_SPINB(b),XQ(A)
  • Actual
    • S(B);N_PINB(b)
    • Threat
      • S(B)
    • Vars
      • B(b);::QAR(A)+S(B),DCHECK,XB(b)
      • S(c);N_GUARD::QAB(A),XS(c)
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