MESON Chess Problem Database

Problem Display
PID: 146805 (qk6/Np6/8/1K6/1N5Q/8/8/8 w - - 0 1)

Luchin, Mikhail A

Canadian Chess Chat, 1983

qk6/Np6/8/1K6/1N5Q/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa7
      • 2.Qd8#
  • Tries
    • 1.Sbc6+?
      • 1...Kc7
        • 2.Qe7#
      • 1...bxc6+!
    • 1.Qh7?
      • 1...Kxa7
        • 2.Sc6#
      • 1...b6
        • 2.Sa6#
      • 1...Qxa7!
  • Keys
    • 1.Qe7!
      • 1...Kxa7
        • 2.Sc6#
      • 1...Qxa7
        • 2.Qd8#
      • 1...b6
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);SBLOCK,XS(D)::QAR2(B)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(B)
      • Refutation
        • P(a);CHECK,XS(A)
    • Try
      • Q(B);
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT,XS(D)::S(A)
        • P(a);N_GUARD::S(A)
      • Refutation
        • Q(b);XS(D)
  • Actual
    • Q(B);
    • Vars
      • K(c);P_SPINP(a),S_FLIGHT,XS(D)::S(A)
      • Q(b);SBLOCK,XS(D)::QAR2(B)
      • P(a);N_GUARD::S(A)
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