MESON Chess Problem Database

Problem Display
PID: 54701 (2k5/r3B3/1Q2K3/1B2N3/8/8/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 2003

2k5/r3B3/1Q2K3/1B2N3/8/8/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Bd7#
    • 1...Ra2
      • 2.Bd7#
    • 1...Ra3
      • 2.Bd7#
    • 1...Ra4
      • 2.Bd7#
    • 1...Ra5
      • 2.Bd7#
    • 1...Ra6
      • 2.Bxa6#
      • 2.Bd7#
    • 1...Rb7
      • 2.Qd8#
    • 1...Rd7
      • 2.Bxd7#
    • 1...Ra8
      • 2.Bd7#
  • Tries
    • 1.Kd6?
      • 1...Rd7+
        • 2.Bxd7#
      • 1...Rb7
        • 2.Qd8#
      • 1...Ra1
        • 2.Bd7#
        • 2.Qc7#
      • 1...Ra2
        • 2.Bd7#
        • 2.Qc7#
      • 1...Ra3
        • 2.Bd7#
        • 2.Qc7#
      • 1...Ra4
        • 2.Bd7#
        • 2.Qc7#
      • 1...Ra5
        • 2.Bd7#
        • 2.Qc7#
      • 1...Ra6
        • 2.Bxa6#
        • 2.Bd7#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Ra8
        • 2.Bd7#
        • 2.Qc7#
      • 1...Rxe7!
    • 1.Sc4?
      • threat
        • 2.Sd6#
      • 1...Rb7
        • 2.Qd8#
      • 1...Rd7
        • 2.Bxd7#
      • 1...Rxe7+!
    • 1.Sc6?
      • threat
        • 2.Sxa7#
        • 2.Qb8#
      • 1...Rxe7+
        • 2.Sxe7#
      • 1...Rc7
        • 2.Qb8#
      • 1...Ra1
        • 2.Qb8#
      • 1...Ra2
        • 2.Qb8#
      • 1...Ra3
        • 2.Qb8#
      • 1...Ra4
        • 2.Qb8#
      • 1...Ra5
        • 2.Qb8#
      • 1...Ra6
        • 2.Bxa6#
        • 2.Qb8#
      • 1...Rb7
        • 2.Qd8#
      • 1...Rd7
        • 2.Qb8#
      • 1...Ra8!
    • 1.Sg6?
      • 1...Rxe7+
        • 2.Sxe7#
      • 1...Rb7
        • 2.Qd8#
      • 1...Ra1
        • 2.Bd7#
      • 1...Ra2
        • 2.Bd7#
      • 1...Ra3
        • 2.Bd7#
      • 1...Ra4
        • 2.Bd7#
      • 1...Ra5
        • 2.Bd7#
      • 1...Ra6
        • 2.Bxa6#
        • 2.Bd7#
      • 1...Rd7
        • 2.Bxd7#
      • 1...Ra8
        • 2.Bd7#
      • 1...Rc7!
    • 1.Sf7?
      • threat
        • 2.Sd6#
      • 1...Rb7
        • 2.Qd8#
      • 1...Rd7
        • 2.Bxd7#
      • 1...Rxe7+!
    • 1.Ba6+?
      • 1...Rb7
        • 2.Qd8#
        • 2.Qxb7#
      • 1...Rxa6!
    • 1.Qc6+?
      • 1...Rc7
        • 2.Qa8#
      • 1...Kb8!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qb8#
      • 1...Rxd7
        • 2.Bxd7#
      • 1...Ra6
        • 2.Bxa6#
      • 1...Rb7
        • 2.Qd8#
      • 1...Ra8
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(a);N_GUARD::B(A)
    • R(a);SBLOCK::QAR1(C)
    • R(a);N_GUARD::B(A),XR(a)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • R(a);CHECK,N_GUARD::B(A),XR(a)
        • R(a);SBLOCK::QAR1(C)
        • R(a);N_GUARD::QAR1(C),XR(a)
      • Refutation
        • R(a);XB(E)
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(a);SBLOCK::QAR1(C)
        • R(a);N_GUARD::B(A),XR(a)
      • Refutation
        • R(a);CHECK,XB(E)
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,XB(E)::S(B),XR(a)
        • R(a);::QAR1(C)
        • R(a);SBLOCK::QAR1(C)
      • Refutation
        • R(a);
    • Try
      • S(B);
      • Vars
        • R(a);CHECK,XB(E)::S(B),XR(a)
        • R(a);SBLOCK::QAR1(C)
        • R(a);N_GUARD::B(A)
        • R(a);N_GUARD::B(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(a);SBLOCK::QAR1(C)
        • R(a);N_GUARD::B(A),XR(a)
      • Refutation
        • R(a);CHECK,XB(E)
    • Try
      • B(A);CHECK
      • Refutation
        • R(a);P_PINQ(C),XB(A)
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a),SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • QAR1(C)
    • Vars
      • R(a);OGATE,XS(B)::B(A),XR(a)
      • R(a);N_GUARD,P_PINQ(C)::B(A),XR(a)
      • R(a);SBLOCK::QAR1(C)
      • R(a);N_GUARD::QAR2(C)
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