MESON Chess Problem Database

Problem Display
PID: 76192 (k7/N2R4/Nr6/8/Q1K5/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2007

k7/N2R4/Nr6/8/Q1K5/8/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6+
      • 2.Qxc6#
  • Tries
    • 1.Qb5?
      • 1...Rc6+
        • 2.Qxc6#
      • 1...Rxa6
        • 2.Qb7#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rd6
        • 2.Qb7#
        • 2.Qb8#
      • 1...Re6
        • 2.Qb7#
        • 2.Qb8#
      • 1...Rf6
        • 2.Qb7#
        • 2.Qb8#
      • 1...Rg6
        • 2.Qb7#
        • 2.Qb8#
      • 1...Rh6
        • 2.Qb7#
        • 2.Qb8#
      • 1...Rb8
        • 2.Qxb8#
      • 1...Rxb5!
    • 1.Qc6+?
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rxc6+!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Ra7#
      • 1...Rb4+
        • 2.Saxb4#
      • 1...Rxc6+
        • 2.Qxc6#
      • 1...Rxa6
        • 2.Qxa6#
      • 1...Rb7
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,N_GUARD::QAB(A),XR(a)
  • Tries
    • Try
      • Q(A);
      • Vars
        • R(a);CHECK,N_GUARD::QAB(A),XR(a)
        • R(a);OGATE,XS(C)::QAB1(A)
        • R(a);OGATE::QAB1(A),XR(a)
        • R(a);OGATE::QAR1(A),XR(a)
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(A),XR(a)
      • Refutation
        • R(a);CHECK,XQ(A)
  • Actual
    • S(D);
    • Threat
      • R1(E)
    • Vars
      • R(a);CHECK,N_GUARD::QAR(A)+S(C),XR(a)
      • R(a);CHECK,OGATE,XS(D)::QAB(A),XR(a)
      • R(a);OGATE,P_SPINR(a),XS(C)::QAR2(A),XR(a)
      • R(a);SBLOCK::QAR(A)+S(C),DCHECK
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