MESON Chess Problem Database

Problem Display
PID: 67761 (8/8/8/B7/8/4p3/1KnN2Q1/3k4 w - - 0 1)

Lincoln, Robert A

StrateGems, 2006

8/8/8/B7/8/4p3/1KnN2Q1/3k4

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ke1
      • 2.Qf1#
    • 1...Sa1
      • 2.Qf1#
    • 1...Sa3
      • 2.Qf1#
    • 1...Sd4
      • 2.Qf1#
    • 1...exd2
      • 2.Qxd2#
  • Tries
    • 1.Sb1?
      • threat
        • 2.Qxc2#
      • 1...Sb4
        • 2.Qf1#
      • 1...Se1
        • 2.Sc3#
      • 1...Sa1
        • 2.Qf1#
      • 1...Sa3
        • 2.Qf1#
      • 1...Sd4
        • 2.Qf1#
      • 1...e2!
    • 1.Sc4?
      • threat
        • 2.Qxc2#
      • 1...Sb4
        • 2.Qf1#
      • 1...Se1
        • 2.Sxe3#
      • 1...Sa1
        • 2.Sxe3#
        • 2.Qf1#
      • 1...Sa3
        • 2.Sxe3#
        • 2.Qf1#
      • 1...Sd4
        • 2.Sxe3#
        • 2.Qf1#
      • 1...e2!
    • 1.Qh1+?
      • 1...Ke2
        • 2.Qf1#
      • 1...Se1!
    • 1.Qf3+?
      • 1...Ke1
        • 2.Qf1#
      • 1...e2!
    • 1.Qg1+?
      • 1...Ke2
        • 2.Qf1#
      • 1...Se1!
  • Keys
    • 1.Se4!
      • threat
        • 2.Qxc2#
      • 1...Sb4
        • 2.Qf1#
      • 1...e2
        • 2.Sf2#
      • 1...Sa1
        • 2.Qf1#
      • 1...Se1
        • 2.Sc3#
      • 1...Sa3
        • 2.Qf1#
      • 1...Sd4
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT::QAR1(C)
    • S(b);N_GUARD::QAR2(C)
    • P(c);OGATE,XS(B)::QAR1(C),XP(c)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(C),XS(b)
      • Vars
        • S(b);N_GUARD::QAR2(C)
        • S(b);SBLOCK::S(B)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Threat
        • QAB1(C),XS(b)
      • Vars
        • S(b);N_GUARD::QAR2(C)
        • S(b);N_GUARD::S(B),XP(c)
      • Refutation
        • P(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • S(B);
    • Threat
      • QAB1(C),XS(b)
    • Vars
      • S(b);N_GUARD::QAR2(C)
      • P(c);N_GUARD,SBLOCK::S(B)
      • S(b);SBLOCK::S(B)
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