MESON Chess Problem Database

Problem Display
PID: 78740 (8/8/1K1p4/3Q4/kN6/8/1Pn5/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2008

8/8/1K1p4/3Q4/kN6/8/1Pn5/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb4
      • 2.Qb5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Qb5#
      • 1...Sa3
        • 2.b3#
      • 1...Sd4
        • 2.Qa2#
        • 2.Qc4#
      • 1...Sb4!
    • 1.Sa6?
      • threat
        • 2.Qb5#
      • 1...Sa3
        • 2.b3#
      • 1...Sd4
        • 2.Qa2#
        • 2.Qc4#
      • 1...Sb4!
    • 1.Sc6?
      • threat
        • 2.Qb5#
      • 1...Sa3
        • 2.b3#
      • 1...Sd4
        • 2.Qa2#
        • 2.Qc4#
      • 1...Sb4!
    • 1.Qa2+?
      • 1...Sa3
        • 2.Qxa3#
      • 1...Kxb4!
    • 1.Qc6+?
      • 1...Kxb4
        • 2.Qb5#
      • 1...Kb3!
    • 1.Qd3?
      • 1...Kxb4
        • 2.Qb5#
      • 1...Sxb4
        • 2.Qa3#
      • 1...Sa1
        • 2.Qa3#
      • 1...Se1
        • 2.Qa3#
      • 1...Sa3
        • 2.Qxa3#
      • 1...Se3
        • 2.Qa3#
      • 1...Sd4
        • 2.Qa3#
      • 1...d5!
  • Keys
    • 1.Sa2!
      • threat
        • 2.Qb5#
      • 1...Sa3
        • 2.b3#
      • 1...Sb4
        • 2.Sc3#
      • 1...Sd4
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT,XS(B)::QAR1(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);SBLOCK::P(A)
      • Refutation
        • S(a);
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);SBLOCK::P(A)
      • Refutation
        • S(a);
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);SBLOCK::P(A)
      • Refutation
        • S(a);
    • Try
      • Q(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(C),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XS(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(B)::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(b);P-FLIGHT,XS(B)::QAR1(C)
        • S(a);N_GUARD,XS(B)::QAR1(C)
        • S(a);N_GUARD::QAR1(C)
        • S(a);N_GUARD::QAR1(C),XS(a)
      • Refutation
        • P(c);
  • Actual
    • S(B);
    • Threat
      • QAB1(C)
    • Vars
      • S(a);SBLOCK::P(A)
      • S(a);SBLOCK::S(B)
      • S(a);N_GUARD::QAR2(C)
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