MESON Chess Problem Database

Problem Display
PID: 55083 (k2n4/8/1K1B3Q/1p6/8/8/8/1r6 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 2004

k2n4/8/1K1B3Q/1p6/8/8/8/1r6

#2

3 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Qc1?
      • threat
        • 2.Qa3#
        • 2.Qc8#
      • 1...Ra1
        • 2.Qxa1#
        • 2.Qc8#
      • 1...Rb2
        • 2.Qc8#
      • 1...Rb3
        • 2.Qc8#
      • 1...Rb4
        • 2.Qc8#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sb7
        • 2.Qc8#
      • 1...b4
        • 2.Qc8#
      • 1...Rxc1!
    • 1.Qh1+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Rxh1!
    • 1.Qh3?
      • threat
        • 2.Qc8#
        • 2.Qa3#
      • 1...Rc1
        • 2.Qa3#
      • 1...Ra1
        • 2.Qc8#
      • 1...Rb3
        • 2.Qc8#
      • 1...Rb4
        • 2.Qc8#
      • 1...Se6
        • 2.Qg2#
        • 2.Qa3#
        • 2.Qf3#
      • 1...Sb7
        • 2.Qc8#
      • 1...b4
        • 2.Qc8#
      • 1...Sc6!
    • 1.Qh7?
      • threat
        • 2.Qa7#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qe4#
      • 1...Ra1!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qa7#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Sc6
        • 2.Qb7#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR2(C)
        • S(d);N_GUARD::QAB(C),XS(d)
        • S(d);::QAR2(C)
        • P(b);::QAR2(C)
      • Refutation
        • R(a);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB(C),XS(d)
        • S(d);N_GUARD,P_SPINS(d)::QAB1(C),XS(d)
      • Refutation
        • R(a);XQ(C)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR(C)
        • R(a);::QAR2(C)
        • S(d);::QAR2(C)
        • P(b);::QAR2(C)
      • Refutation
        • S(d);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • S(d);N_GUARD::QAB1(C)
        • S(d);N_GUARD::QAB1(C),XS(d)
        • S(d);N_GUARD::QAB(C)
      • Refutation
        • R(a);
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • R(a);N_GUARD::QAB(C),XR(a)
      • S(d);N_GUARD::QAB1(C)
      • S(d);N_GUARD::QAB1(C),XS(d)
      • S(d);N_GUARD::QAB(C)
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