MESON Chess Problem Database

Problem Display
PID: 253137 (Q5B1/4B3/3pp3/8/P2k2P1/3Pp3/4P3/K7 w - - 0 1)

Anonymous

The Field, 1909

(First published on Sat Aug 28 1909)

Q5B1/4B3/3pp3/8/P2k2P1/3Pp3/4P3/K7

#2

8 + 4

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qe4#
  • Tries
    • 1.Qc6?
      • 1...Ke5
        • 2.Qe4#
        • 2.Qxd6#
      • 1...e5
        • 2.Qc4#
      • 1...d5!
    • 1.Qb7?
      • 1...Kc3
        • 2.Qb2#
      • 1...Ke5
        • 2.Qe4#
      • 1...d5
        • 2.Qb2#
      • 1...e5
        • 2.Qb4#
      • 1...Kc5!
    • 1.Qa5?
      • 1...e5
        • 2.Qb4#
      • 1...d5!
  • Keys
    • 1.Qb8!
      • 1...Kc3
        • 2.Qb2#
      • 1...Kc5
        • 2.Qxd6#
      • 1...Kd5
        • 2.Qxd6#
      • 1...Ke5
        • 2.Qxd6#
      • 1...d5
        • 2.Qb2#
      • 1...e5
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(b);N_GUARD,S_FLIGHT::QAR1(G)
  • Tries
    • Try
      • Q(G);
      • Vars
        • P(d);SBLOCK::QAR1(G)
      • Refutation
        • P(c);
    • Try
      • Q(G);
      • Vars
        • K(b);N_GUARD,S_FLIGHT::QAB1(G)
        • K(b);N_GUARD,S_FLIGHT::QAR1(G)
        • P(c);SBLOCK::QAB(G)
        • P(d);SBLOCK::QAR2(G)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
    • Try
      • Q(G);
      • Vars
        • P(d);SBLOCK::QAR2(G)
      • Refutation
        • P(c);
  • Actual
    • Q(G);
    • Vars
      • K(b);N_GUARD,S_FLIGHT::QAB1(G)
      • K(b);N_GUARD,P_SPINP(c),S_FLIGHT::QAB1(G),XP(c)
      • K(b);N_GUARD,P-FLIGHT,P_SPINP(d)::QAR1(G),XP(c)
      • P(c);SBLOCK::QAB(G)
      • P(d);SBLOCK::QAR2(G)
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