MESON Chess Problem Database

Problem Display
PID: 46638 (1Bkn4/R7/3Qn3/8/8/8/8/4K3 w - - 0 1)

Lund, Johannes H

Ostledingen, 1961

1Bkn4/R7/3Qn3/8/8/8/8/4K3

#2

4 + 3

4884 154 norske miniatyrproblemer 1974

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Qc7#
    • 1...Sf4
      • 2.Qc7#
    • 1...Sc5
      • 2.Qc7#
    • 1...Sg5
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
    • 1...Sg7
      • 2.Qc7#
    • 1...Sf8
      • 2.Qc7#
  • Tries
    • 1.Rc7+?
      • 1...Sxc7
        • 2.Qxc7#
      • 1...Kxb8!
    • 1.Qc6+?
      • 1...Kxb8
        • 2.Ra8#
        • 2.Qa8#
      • 1...Sc7
        • 2.Qxc7#
      • 1...Sxc6!
  • Keys
    • 1.Bc7!
      • 1...Sxc7
        • 2.Qxc7#
      • 1...Sc6
        • 2.Qxe6#
      • 1...Sd4
        • 2.Qxd8#
      • 1...Sf4
        • 2.Qxd8#
      • 1...Sc5
        • 2.Qxd8#
      • 1...Sg5
        • 2.Qxd8#
      • 1...Sg7
        • 2.Qxd8#
      • 1...Sf8
        • 2.Qxd8#
      • 1...Sb7
        • 2.Ra8#
      • 1...Sf7
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 6
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);N_GUARD::QAR1(B),XS(a)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(a);OGATE,XR(C)::QAR1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XB(D)
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • S(c);XQ(B)
  • Actual
    • B(D);
    • Vars
      • S(a);OGATE,XB(D)::QAR1(B),XS(a)
      • S(c);N_GUARD::QAB(B),XS(a)
      • S(a);N_GUARD::QAR1(B),XS(c)
      • S(c);SBLOCK::R(C)
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