MESON Chess Problem Database

Problem Display
PID: 258518 (8/8/8/R7/2k5/6Q1/b7/1nKN4 w - - 0 1)

Buchwald, Julius

Die Schwalbe, 1931

8/8/8/R7/2k5/6Q1/b7/1nKN4

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qc3#
    • 1...Sa3
      • 2.Qc3#
    • 1...Sc3
      • 2.Qxc3#
  • Tries
    • 1.Sb2+?
      • 1...Kd4
        • 2.Qe5#
        • 2.Qd3#
      • 1...Kb4!
    • 1.Qf4+?
      • 1...Kb3
        • 2.Qa4#
      • 1...Kd3!
    • 1.Qh4+?
      • 1...Kb3
        • 2.Qa4#
      • 1...Kd3!
    • 1.Qd3+?
      • 1...Kb4
        • 2.Qb5#
      • 1...Kxd3!
    • 1.Qe3?
      • 1...Sc3
        • 2.Qxc3#
      • 1...Bb3
        • 2.Qe4#
      • 1...Sd2
        • 2.Qc3#
      • 1...Sa3
        • 2.Qc3#
      • 1...Kb4!
    • 1.Qg4+?
      • 1...Kb3
        • 2.Qa4#
      • 1...Kd3!
  • Keys
    • 1.Qe5!
      • 1...Kb3
        • 2.Qb5#
      • 1...Kd3
        • 2.Sb2#
      • 1...Kb4
        • 2.Qb5#
      • 1...Bb3
        • 2.Qe4#
      • 1...Sd2
        • 2.Qc3#
      • 1...Sa3
        • 2.Qc3#
      • 1...Sc3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(C)
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • B(b);SBLOCK::QAR2(C)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(c);N_GUARD,S_FLIGHT::QAR2(C)
      • K(c);N_GUARD,S_FLIGHT::S(B)
      • K(c);N_GUARD,P-FLIGHT::QAR1(C)
      • B(b);SBLOCK::QAR2(C)
      • S(a);N_GUARD::QAR1(C)
      • S(a);N_GUARD::QAR1(C),XS(a)
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