MESON Chess Problem Database

Problem Display
PID: 21886 (8/8/7p/R1B5/2k5/2n5/2K5/7Q w - - 0 1)

Larsen, Karl Adolf Koefoed

Sydsvenska Dagbladet Snallposten, 1921

8/8/7p/R1B5/2k5/2n5/2K5/7Q

#2

4 + 3

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qe4#
    • 1...Sd1
      • 2.Qe4#
    • 1...Sa2
      • 2.Qe4#
    • 1...Sa4
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sd5
      • 2.Qe4#
      • 2.Qf1#
  • Tries
    • 1.Qc6?
      • 1...Se2
        • 2.Ra4#
        • 2.Qe6#
      • 1...Sb1
        • 2.Ra4#
        • 2.Qe4#
        • 2.Qe6#
      • 1...Sd1
        • 2.Ra4#
        • 2.Qe4#
        • 2.Qe6#
      • 1...Sa2
        • 2.Qe4#
        • 2.Qe6#
      • 1...Sa4
        • 2.Rxa4#
        • 2.Qe4#
        • 2.Qe6#
      • 1...Se4
        • 2.Ra4#
        • 2.Qxe4#
        • 2.Qe6#
      • 1...Sb5
        • 2.Ra4#
      • 1...Sd5
        • 2.Qb5#
        • 2.Qa6#
      • 1...h5!
    • 1.Qf1+?
      • 1...Se2
        • 2.Qf7#
      • 1...Kd5!
    • 1.Qh4+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Kd5!
  • Keys
    • 1.Qh5!
      • 1...Sb1
        • 2.Qf7#
      • 1...Sd1
        • 2.Qf7#
      • 1...Sa2
        • 2.Qf7#
      • 1...Se2
        • 2.Qf7#
      • 1...Sa4
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sb5
        • 2.Ra4#
      • 1...Sd5
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(A)
    • S(a);N_GUARD::QAR2(A),XS(a)
  • Tries
    • Try
      • Q(A);
      • Vars
        • S(a);N_GUARD::R(C)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR2(A),XS(a)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • S(a);N_GUARD::QAB(A)
      • S(a);N_GUARD,SBLOCK::R(C)
      • S(a);N_GUARD,SBLOCK::QAB(A)
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