MESON Chess Problem Database

Problem Display
PID: 81651 (8/8/6R1/8/1K6/8/kb1Q4/3n3R w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 2008

8/8/6R1/8/1K6/8/kb1Q4/3n3R

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Ra6#
      • 2.Qd5#
    • 1...Se3
      • 2.Ra6#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Ra6#
      • 1...Sc3
        • 2.Qb3#
      • 1...Ka1!
  • Keys
    • 1.Rg2!
      • 1...Ka1
        • 2.Qxb2#
      • 1...Kb1
        • 2.Qxb2#
      • 1...Sf2
        • 2.Qd5#
      • 1...Sc3
        • 2.Qxb2#
      • 1...Se3
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);::R(D)
  • Tries
    • Try
      • Q(B);
      • Threat
        • R(D)
      • Vars
        • S(a);::QAB1(B)
      • Refutation
        • K(b);N_SPINB(c),P-FLIGHT,P_SPINS(a)
  • Actual
    • R(D);
    • Vars
      • K(b);N_SPINB(c),P-FLIGHT,P_SPINS(a)::QAB1(B),XB(c)
      • K(b);N_SPINB(c),P_SPINS(a),S_FLIGHT::QAR1(B),XB(c)
      • S(a);::QAB(B)
      • S(a);N_GUARD::QAR1(B),XB(c)
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