MESON Chess Problem Database

Problem Display
PID: 234682 (k7/2QK4/8/3N4/P7/8/R7/1r6 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2010

k7/2QK4/8/3N4/P7/8/R7/1r6

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sb6#
    • 1...Rc1
      • 2.Sb6#
    • 1...Re1
      • 2.Sb6#
    • 1...Rf1
      • 2.Sb6#
    • 1...Rg1
      • 2.Sb6#
    • 1...Rh1
      • 2.Sb6#
    • 1...Rb5
      • 2.axb5#
    • 1...Rb6
      • 2.Sxb6#
  • Tries
    • 1.Rb2?
      • threat
        • 2.Sb6#
        • 2.Qa5#
        • 2.Qb8#
        • 2.Qb7#
      • 1...Rd1
        • 2.Rb8#
        • 2.Qa5#
        • 2.Qb8#
        • 2.Qb7#
      • 1...Rxb2!
    • 1.Qc8+?
      • 1...Rb8
        • 2.Qa6#
      • 1...Ka7!
  • Keys
    • 1.Kc8!
      • threat
        • 2.Qa5#
      • 1...Rb8+
        • 2.Qxb8#
      • 1...Rb7
        • 2.Qxb7#
      • 1...Rc1
        • 2.Sb6#
      • 1...Rb5
        • 2.axb5#
      • 1...Rb6
        • 2.Sxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(a);N_GUARD::S(C)
    • R(a);OGATE::R(A)+P(B),XR(a)
    • R(a);N_GUARD::S(C),XR(a)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(4)
      • Refutation
        • R(a);XR(A)
    • Try
      • Q(D);CHECK
      • Vars
        • R(a);P_SPINR(a),SBLOCK::QAR2(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • QAR(D)
    • Vars
      • R(a);CHECK,N_GUARD::QAR1(D),XR(a)
      • R(a);N_GUARD::QAB1(D),XR(a)
      • R(a);N_GUARD,P_PINQ(D)::S(C)
      • R(a);OGATE::R(A)+P(B),XR(a)
      • R(a);N_GUARD::S(C),XR(a)
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