MESON Chess Problem Database

Problem Display
PID: 258120 (4bQN1/1pB1N1p1/1Pp1k1p1/8/8/7K/8/8 w - - 0 1)

Schiffmann, Abraham

Berliner Morgenpost, 1958

4bQN1/1pB1N1p1/1Pp1k1p1/8/8/7K/8/8

#2

6 + 6

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bf7
      • 2.Qc8#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Qf4?
      • 1...Kd7
        • 2.Qd6#
        • 2.Qg4#
      • 1...Bd7
        • 2.Qc4#
      • 1...Bf7
        • 2.Qd6#
        • 2.Qg4#
      • 1...g5
        • 2.Qf5#
      • 1...c5!
    • 1.Qf6+?
      • 1...Kd7
        • 2.Qd6#
      • 1...gxf6!
  • Keys
    • 1.Qf3!
      • 1...Kd7
        • 2.Qg4#
      • 1...Bd7
        • 2.Qb3#
      • 1...Bf7
        • 2.Qg4#
      • 1...c5
        • 2.Qd5#
      • 1...g5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(f);OGATE,SBLOCK::QAB(E)
    • P(c);N_GUARD::QAB1(E)
  • Tries
    • Try
      • Q(E);
      • Vars
        • B(f);SBLOCK::QAB(E)
        • P(c);N_GUARD::QAB1(E)
      • Refutation
        • P(a);
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(E)
      • Refutation
        • P(e);XQ(E)
  • Actual
    • Q(E);
    • Vars
      • K(b);N_GUARD,S_FLIGHT::QAB(E)
      • B(f);SBLOCK::QAB(E)
      • P(a);N_GUARD::QAB1(E)
      • P(c);N_GUARD::QAB1(E)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).