MESON Chess Problem Database

Problem Display
PID: 173512 (8/8/K3B3/3N4/k7/1r2Q3/p7/8 w - - 0 1)

Lincoln, Robert A

Springaren, 2017

8/8/K3B3/3N4/k7/1r2Q3/p7/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Ra3
      • 2.Bd7#
  • Tries
    • 1.Bd7+?
      • 1...Rb5
        • 2.Bxb5#
      • 1...Ka3!
    • 1.Qd4+?
      • 1...Rb4
        • 2.Qxb4#
      • 1...Ka3!
    • 1.Qf4+?
      • 1...Rb4
        • 2.Qxb4#
      • 1...Ka3!
    • 1.Qe4+?
      • 1...Rb4
        • 2.Qxb4#
      • 1...Ka3!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qa5#
      • 1...Rb6+
        • 2.Sxb6#
      • 1...Rb1
        • 2.Sc3#
      • 1...Rb2
        • 2.Sc3#
      • 1...Ra3
        • 2.Sb6#
        • 2.Qb4#
        • 2.Qc4#
        • 2.Qb5#
      • 1...Rc3
        • 2.Sxc3#
        • 2.Sb6#
        • 2.Qb4#
      • 1...Rd3
        • 2.Sb6#
        • 2.Qb4#
      • 1...Re3
        • 2.Sb6#
        • 2.Qb4#
      • 1...Rf3
        • 2.Sb6#
        • 2.Qb4#
      • 1...Rg3
        • 2.Sb6#
        • 2.Qb4#
      • 1...Rh3
        • 2.Sb6#
        • 2.Qb4#
      • 1...Rb4
        • 2.Qxb4#
      • 1...Rb5
        • 2.Sc3#
      • 1...Rb7
        • 2.Sc3#
      • 1...Rb8
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::B(D)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::B(D),XR(b)
      • Refutation
        • K(c);P-FLIGHT,P_SPINR(b)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • R(b);CHECK,N_GUARD::S(B),XR(b)
      • R(b);N_GUARD::S(B)
      • R(b);N_GUARD::QAR1(A),XR(b)
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