MESON Chess Problem Database

Problem Display
PID: 183409 (BRR5/2P2q2/pb6/N1k2N1p/5p2/Pp6/7K/5Q2 w - - 0 1)

Karlstrom, Alfred Olaf

Western Morning News, 1938

BRR5/2P2q2/pb6/N1k2N1p/5p2/Pp6/7K/5Q2

#2

9 + 7

56 The Problemist 1943

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qxc4#
    • 1...Qg6
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qe8
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qf6
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qxc7
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qd7
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qe7
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qg7
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qh7
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Qf8
      • 2.Sxb3#
      • 2.Qc4#
    • 1...Ba7
      • 2.Qg1#
      • 2.Qf2#
    • 1...Bxc7
      • 2.Qg1#
      • 2.Qf2#
  • Tries
    • 1.Qxa6?
      • threat
        • 2.Qxb6#
      • 1...Bxa5
        • 2.Qb5#
        • 2.Qc6#
      • 1...Bxc7
        • 2.Rb5#
        • 2.Qb5#
        • 2.Qb6#
        • 2.Qc6#
        • 2.Qd6#
        • 2.Qa7#
      • 1...Qg6
        • 2.Sxb3#
        • 2.Qc4#
      • 1...Qf6
        • 2.Sxb3#
        • 2.Qc4#
      • 1...Ba7
        • 2.Rb5#
        • 2.Qb5#
        • 2.Qc6#
        • 2.Qd6#
        • 2.Qxa7#
      • 1...Qe6!
    • 1.Qc1+?
      • 1...Qc4
        • 2.Qxc4#
      • 1...Kb5!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Qb4#
      • 1...Kb5
        • 2.Qb4#
      • 1...Qxc7
        • 2.Qe5#
      • 1...Bxa5
        • 2.Qd4#
      • 1...Bxc7
        • 2.Qd6#
      • 1...Qc4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD::QAR1(A),XQ(g)
  • Tries
    • Try
      • Q(A);XP(e)
      • Threat
        • QAB1(A),XB(f)
      • Refutation
        • Q(g);
    • Try
      • Q(A);CHECK
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::QAR1(A),XQ(g)
      • Refutation
        • K(c);P-FLIGHT,P_SPINB(f)
  • Actual
    • Q(A);XP(b)
    • Threat
      • QAB1(A)
    • Vars
      • K(c);P-FLIGHT,P_SPINB(f)::QAR1(A)
      • Q(g);N_GUARD,P_PINQ(A),P_SPINQ(g),XP(F)::QAR2(A)
      • B(f);XS(D)::QAB1(A)
      • B(f);P_PINQ(A),P_SPINB(f),XP(F)::QAB1(A)
      • Q(g);N_GUARD::QAR1(A),XQ(g)
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